fusion/doc/adapted.qbk

[/==============================================================================
    Copyright (C) 2001-2011 Joel de Guzman
    Copyright (C) 2006 Dan Marsden
    Copyright (C) 2010 Christopher Schmidt

    Use, modification and distribution is subject to the Boost Software
    License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
    http://www.boost.org/LICENSE_1_0.txt)
===============================================================================/]
[section Adapted]

Fusion provides a couple of adapters for other sequences such as arrays,
`std::pair`, __mpl__ sequences, and `boost::array`. These adapters are
written using Fusion's non-intrusive __extension__ mechanism. If you wish
to use these sequences with fusion, simply include the necessary files and
they will be regarded as first-class, fully conforming fusion sequences.

Fusion also provides various schemes to make it easy for the user to adapt
various data structures, non-intrusively, as full fledged Fusion sequences.

[heading Header]

    #include <boost/fusion/adapted.hpp>
    #include <boost/fusion/include/adapted.hpp>

[section:array Array]

This module provides adapters for arrays. Including the module
header makes any array a fully conforming __random_access_sequence__.

[heading Header]

    #include <boost/fusion/adapted/array.hpp>
    #include <boost/fusion/include/array.hpp>

[heading Model of]

* __random_access_sequence__

[heading Example]

    int arr[3] = {1,2,3};

    std::cout << *__begin__(arr) << std::endl;
    std::cout << *__next__(__begin__(arr)) << std::endl;
    std::cout << *__advance_c__<2>(__begin__(arr)) << std::endl;
    std::cout << *__prior__(__end__(arr)) << std::endl;
    std::cout << __at_c__<2>(arr) << std::endl;

[endsect]

[section std::pair]

This module provides adapters for `std::pair`. Including the module header
makes `std::pair` a fully conforming __random_access_sequence__.

[heading Header]

    #include <boost/fusion/adapted/std_pair.hpp>
    #include <boost/fusion/include/std_pair.hpp>

[heading Model of]

* __random_access_sequence__

[heading Example]

    std::pair<int, std::string> p(123, "Hola!!!");
    std::cout << __at_c__<0>(p) << std::endl;
    std::cout << __at_c__<1>(p) << std::endl;
    std::cout << p << std::endl;

[heading See also]

__std_pair_doc__, __tr1_tuple_pair__

[endsect]

[section std::tuple]

This module provides adapters for `std::tuple`. Including the module header
makes `std::tuple` a fully conforming __random_access_sequence__.

[important To be fully conforming, compiler should support C++11 Variadic Templates.]

[heading Header]

    #include <boost/fusion/adapted/std_tuple.hpp>
    #include <boost/fusion/include/std_tuple.hpp>

[heading Model of]

* __random_access_sequence__

[heading Example]

    std::tuple<int, std::string, float> p(123, "Hola!!!", 456.f);
    std::cout << __at_c__<0>(p) << std::endl;
    std::cout << __at_c__<1>(p) << std::endl;
    std::cout << p << std::endl;

[heading See also]

__std_tuple_doc__

[endsect]

[section mpl sequence]

This module provides adapters for __mpl__ sequences. Including the module
header makes all __mpl__ sequences fully conforming fusion sequences.

[heading Header]

    #include <boost/fusion/adapted/mpl.hpp>
    #include <boost/fusion/include/mpl.hpp>

[heading Model of]

* __forward_sequence__ (If the __mpl__ sequence is a forward sequence.)
* __bidirectional_sequence__ (If the __mpl__ sequence is a bidirectional sequence.)
* __random_access_sequence__ (If the __mpl__ sequence is a random access sequence.)

[heading Example]

    mpl::vector_c<int, 123, 456> vec_c;
    fusion::vector2<int, long> v(vec_c);
    std::cout << __at_c__<0>(v) << std::endl;
    std::cout << __at_c__<1>(v) << std::endl;

    v = mpl::vector_c<int, 456, 789>();
    std::cout << __at_c__<0>(v) << std::endl;
    std::cout << __at_c__<1>(v) << std::endl;

[heading Bi-directional adaptation]

Fusion sequences may also be adapted as fully conforming __mpl__ sequences (see
__intrinsics__). That way, we can have 2-way adaptation to and from __mpl__ and
Fusion. To make Fusion sequences fully conforming __mpl__ sequences, include:

    #include <boost/fusion/mpl.hpp>

If you want bi-directional adaptation to and from __mpl__ and Fusion, simply
include:

    #include <boost/fusion/include/mpl.hpp>

The header includes all the necessary headers.

[heading See also]

__mpl__

[endsect]

[section boost::array]

This module provides adapters for `boost::array`. Including the module
header makes `boost::array` a fully conforming __random_access_sequence__.

[heading Header]

    #include <boost/fusion/adapted/boost_array.hpp>
    #include <boost/fusion/include/boost_array.hpp>

[heading Model of]

* __random_access_sequence__

[heading Example]

    boost::array<int,3> arr = {{1,2,3}};

    std::cout << *__begin__(arr) << std::endl;
    std::cout << *__next__(__begin__(arr)) << std::endl;
    std::cout << *__advance_c__<2>(__begin__(arr)) << std::endl;
    std::cout << *__prior__(__end__(arr)) << std::endl;
    std::cout << __at_c__<2>(arr) << std::endl;

[heading See also]

__boost_array_library__

[endsect]

[section boost::tuple]
This module provides adapters for `boost::tuple`. Including the module
header makes `boost::tuple` a fully conforming __forward_sequence__.

[heading Header]

    #include <boost/fusion/adapted/boost_tuple.hpp>
    #include <boost/fusion/include/boost_tuple.hpp>

[heading Model of]

* __forward_sequence__

[heading Example]

    boost::tuple<int,std::string> example_tuple(101, "hello");
    std::cout << *__begin__(example_tuple) << '\n';
    std::cout << *__next__(__begin__(example_tuple)) << '\n';

[heading See also]

__boost_tuple_library__

[endsect]

[section:adapt_struct BOOST_FUSION_ADAPT_STRUCT]

[heading Description]
BOOST_FUSION_ADAPT_STRUCT is a macro that can be used to generate all the
necessary boilerplate to make an arbitrary struct a model of
__random_access_sequence__.

[heading Synopsis]
    BOOST_FUSION_ADAPT_STRUCT(
        struct_name,
        member_name0,
        member_name1,
        member_name2,
        ...
        )

    // Without BOOST_PP_VARIADICS support :
    BOOST_FUSION_ADAPT_STRUCT(
        struct_name,
        (member_type0, member_name0)
        (member_type1, member_name1)
        (auto, member_name2)
        ...
        )

[heading Semantics]

The above macro generates the necessary code to adapt `struct_name`
as a model of __random_access_sequence__.

The sequence of `member_nameN,` arguments or  `(member_typeN, member_nameN)`
pairs declares the type and names of each of the struct members that are part of
the sequence.

When member_typeN is omitted or set to auto, the type is
infered with Boost.TypeOf.

The macro should be used at global scope, and `struct_name` should be the fully
namespace qualified name of the struct to be adapted.

[heading Header]

    #include <boost/fusion/adapted/struct/adapt_struct.hpp>
    #include <boost/fusion/include/adapt_struct.hpp>

[heading Example: BOOST_FUSION_ADAPT_STRUCT ]
    namespace demo
    {
        struct employee
        {
            std::string name;
            int age;
        };
    }

    // demo::employee is now a Fusion sequence
    BOOST_FUSION_ADAPT_STRUCT(
        demo::employee,
        name,
        age)

    // Without BOOST_PP_VARIADICS support :
    BOOST_FUSION_ADAPT_STRUCT(
        demo::employee,
        (auto, name)
        (auto, age)
    )

[endsect]

[section:adapt_tpl_struct BOOST_FUSION_ADAPT_TPL_STRUCT]

[heading Description]
BOOST_FUSION_ADAPT_TPL_STRUCT is a macro that can be used to generate all the
necessary boilerplate to make an arbitrary template struct a model of
__random_access_sequence__.

[heading Synopsis]
    BOOST_FUSION_ADAPT_TPL_STRUCT(
        (template_param0)(template_param1)...,
        (struct_name) (specialization_param0)(specialization_param1)...,
        member_name0,
        member_name1
        ...
        )

    // Without BOOST_PP_VARIADICS support :
    BOOST_FUSION_ADAPT_TPL_STRUCT(
        (template_param0)(template_param1)...,
        (struct_name) (specialization_param0)(specialization_param1)...,
        (member_type0, member_name0)
        (member_type1, member_name1)
        (auto, member_name2),
        ...
        )

[heading Semantics]

The above macro generates the necessary code to adapt `struct_name` or an
arbitrary specialization of `struct_name` as a model of
__random_access_sequence__.
The sequence `(template_param0)(template_param1)...` declares the names of
the template type parameters used.
The sequence `(specialization_param0)(specialization_param1)...`
declares the template parameters of the actual specialization of `struct_name`
that is adapted as a fusion sequence.
The sequence of `member_nameN,` arguments or  `(member_typeN, member_nameN)`
pairs declares the type and names of each of the struct members that are part of
the sequence.

When member_typeN is omitted or set to auto, the type is
infered with Boost.TypeOf.

The macro should be used at global scope, and `struct_name` should be the fully
namespace qualified name of the struct to be adapted.

[heading Header]

    #include <boost/fusion/adapted/struct/adapt_struct.hpp>
    #include <boost/fusion/include/adapt_struct.hpp>

[heading Example]
    namespace demo
    {
        template<typename Name, typename Age>
        struct employee
        {
            Name name;
            Age age;
            int employment_timestamp;
        };
    }

    // Any instantiated demo::employee is now a Fusion sequence
    BOOST_FUSION_ADAPT_TPL_STRUCT(
        (Name)(Age),
        (demo::employee) (Name)(Age),
        (Name, name)
        (Age, age)
        (auto, employment_timestamp))

    // Or by infering type completely
    BOOST_FUSION_ADAPT_TPL_STRUCT(
        (Name)(Age),
        (demo::employee) (Name)(Age),
        name,
        age,
        employment_timestamp)

[endsect]

[section:adapt_struct_named BOOST_FUSION_ADAPT_STRUCT_NAMED]

[heading Description]
BOOST_FUSION_ADAPT_STRUCT_NAMED and BOOST_FUSION_ADAPT_STRUCT_NAMED_NS are
macros that can be used to generate all the necessary boilerplate to make an
arbitrary struct a model of __random_access_sequence__. The given struct is
adapted using the given name.

[heading Synopsis]
    BOOST_FUSION_ADAPT_STRUCT_NAMED(
        struct_name, adapted_name,
        member_name0,
        member_name1,
        member_name2,
        ...
        )

    BOOST_FUSION_ADAPT_STRUCT_NAMED_NS(
        struct_name,
        (namespace0)(namespace1)...,
        adapted_name,
        member_name0,
        member_name1,
        member_name2,
        ...
        )

    // Without BOOST_PP_VARIADICS support :

    BOOST_FUSION_ADAPT_STRUCT_NAMED(
        struct_name, adapted_name,
        (member_type0, member_name0)
        (member_type1, member_name1)
        (auto, member_name2),
        ...
        )

    BOOST_FUSION_ADAPT_STRUCT_NAMED_NS(
        struct_name,
        (namespace0)(namespace1)...,
        adapted_name,
        (member_type0, member_name0)
        (member_type1, member_name1)
        (auto, member_name2),
        ...
        )


[heading Semantics]

The above macros generate the necessary code to adapt `struct_name`
as a model of __random_access_sequence__ while using `adapted_name` as the
name of the adapted struct.
The sequence `(namespace0)(namespace1)...` declares the namespace
for `adapted_name`. It yields to a fully qualified name for `adapted_name` of
`namespace0::namespace1::... adapted_name`.
If an empty namespace sequence is given (that is a macro that expands to
nothing), the adapted view is placed in the global namespace.
If no namespace sequence is given (i.e. `BOOST_FUSION_ADAPT_STRUCT_NAMED`), the
adapted view is placed in the namespace `boost::fusion::adapted`.
The sequence of `member_nameN,` arguments or  `(member_typeN, member_nameN)`
pairs declares the type and names of each of the struct members that are part of
the sequence.

When member_typeN is omitted or set to auto, the type is
infered with Boost.TypeOf.

The macros should be used at global scope, and `struct_name` should be the fully
namespace qualified name of the struct to be converted.

[heading Header]

    #include <boost/fusion/adapted/struct/adapt_struct_named.hpp>
    #include <boost/fusion/include/adapt_struct_named.hpp>

[heading Example]
    namespace demo
    {
        struct employee
        {
            std::string name;
            int age;
        };
    }

    // boost::fusion::adapted::adapted_employee is now a Fusion sequence
    // referring to demo::employee
    BOOST_FUSION_ADAPT_STRUCT_NAMED(
        demo::employee, adapted_employee,
        name,
        age)

    // Without BOOST_PP_VARIADICS support :
    BOOST_FUSION_ADAPT_STRUCT_NAMED(
        demo::employee, adapted_employee,
        (auto, name),
        (auto, age))

[endsect]

[section:adapt_assoc BOOST_FUSION_ADAPT_ASSOC_STRUCT]

[heading Description]
BOOST_FUSION_ADAPT_ASSOC_STRUCT is a macro that can be used to generate all the
necessary boilerplate to make an arbitrary struct a model of
__random_access_sequence__ and __associative_sequence__.

[heading Synopsis]
    BOOST_FUSION_ADAPT_ASSOC_STRUCT(
        struct_name,
        ([member_type0,] member_name0, key_type0)
        ([member_type1,] member_name1, key_type1)
        ...
        )

[heading Semantics]

The above macro generates the necessary code to adapt `struct_name`
as a model of __random_access_sequence__ and __associative_sequence__.
The sequence of `([member_typeN,] member_nameN, key_typeN)` tuples
declares the type, name and key type of each of the struct members
that are part of the sequence.

When member_typeN is omitted or set to auto, the type is
infered with Boost.TypeOf.

The macro should be used at global scope, and `struct_name` should be the fully
namespace qualified name of the struct to be adapted.

[heading Header]

    #include <boost/fusion/adapted/struct/adapt_assoc_struct.hpp>
    #include <boost/fusion/include/adapt_assoc_struct.hpp>

[heading Example]
    namespace demo
    {
        struct employee
        {
            std::string name;
            int age;
        };
    }

    namespace keys
    {
        struct name;
        struct age;
    }

    // demo::employee is now a Fusion sequence.
    // It is also an associative sequence with
    // keys keys::name and keys::age present.
    BOOST_FUSION_ADAPT_ASSOC_STRUCT(
        demo::employee,
        (name, keys::name)
        (age, keys::age))

    // Without BOOST_PP_VARIADICS support :
    BOOST_FUSION_ADAPT_ASSOC_STRUCT(
        demo::employee,
        (auto, name, keys::name),
        (auto, age, keys::name))

[endsect]

[section:adapt_assoc_tpl_struct BOOST_FUSION_ADAPT_ASSOC_TPL_STRUCT]

[heading Description]
BOOST_FUSION_ADAPT_ASSOC_TPL_STRUCT is a macro that can be used to generate all the
necessary boilerplate to make an arbitrary template struct a model of
__random_access_sequence__ and __associative_sequence__.

[heading Synopsis]
    BOOST_FUSION_ADAPT_ASSOC_TPL_STRUCT(
        (template_param0)(template_param1)...,
        (struct_name) (specialization_param0)(specialization_param1)...,
        ([member_type0,] member_name0, key_type0)
        ([member_type1,] member_name1, key_type1)
        ...
        )

[heading Semantics]

The above macro generates the necessary code to adapt `struct_name` or an
arbitrary specialization of `struct_name` as a model of
__random_access_sequence__ and __associative_sequence__.
The sequence `(template_param0)(template_param1)...` declares the names of
the template type parameters used.
The sequence `(specialization_param0)(specialization_param1)...`
declares the template parameters of the actual specialization of `struct_name`
that is adapted as a fusion sequence.
The sequence of `([member_typeN,] member_nameN, key_typeN)`
tuples declares the type, name and key type of each of the struct members
that are part of the sequence.

When member_typeN is omitted or set to auto, the type is
infered with Boost.TypeOf.

The macro should be used at global scope, and `struct_name` should be the fully
namespace qualified name of the struct to be adapted.

[heading Header]

    #include <boost/fusion/adapted/struct/adapt_assoc_struct.hpp>
    #include <boost/fusion/include/adapt_assoc_struct.hpp>

[heading Example]
    namespace demo
    {
        template<typename Name, typename Age>
        struct employee
        {
            Name name;
            Age age;
        };
    }

    namespace keys
    {
        struct name;
        struct age;
    }

    // Any instantiated demo::employee is now a Fusion sequence.
    // It is also an associative sequence with
    // keys keys::name and keys::age present.
    BOOST_FUSION_ADAPT_ASSOC_TPL_STRUCT(
        (Name)(Age),
        (demo::employee) (Name)(Age),
        (name, keys::name)
        (age, keys::age))

    // Without BOOST_PP_VARIADICS support :
    BOOST_FUSION_ADAPT_ASSOC_TPL_STRUCT(
        (Name)(Age),
        (demo::employee) (Name)(Age),
        (Name, name, keys::name)
        (Age, age, keys::age))

[endsect]

[section:adapt_assoc_struct_named BOOST_FUSION_ADAPT_ASSOC_STRUCT_NAMED]

[heading Description]
BOOST_FUSION_ADAPT_ASSOC_STRUCT_NAMED and BOOST_FUSION_ADAPT_ASSOC_STRUCT_NAMED_NS are
macros that can be used to generate all the necessary boilerplate to make an
arbitrary struct a model of __random_access_sequence__ and
__associative_sequence__. The given struct is adapted using the given name.

[heading Synopsis]
    BOOST_FUSION_ADAPT_ASSOC_STRUCT_NAMED(
        struct_name, adapted_name,
        ([member_type0,] member_name0, key_type0)
        ([member_type1,] member_name1, key_type1)
        ...
        )

    BOOST_FUSION_ADAPT_ASSOC_STRUCT_NAMED_NS(
        struct_name,
        (namespace0)(namespace1)...,
        adapted_name,
        ([member_type0,] member_name0, key_type0)
        ([member_type1,] member_name1, key_type1)
        ...
        )

[heading Semantics]

The above macros generate the necessary code to adapt `struct_name`
as a model of __random_access_sequence__ and __associative_sequence__ while
using `adapted_name` as the name of the adapted struct.
The sequence `(namespace0)(namespace1)...` declares the namespace
for `adapted_name`. It yields to a fully qualified name for `adapted_name` of
`namespace0::namespace1::... adapted_name`.
If an empty namespace sequence is given (that is a macro that expands to
nothing), the adapted view is placed in the global namespace.
If no namespace sequence is given (i.e. `BOOST_FUSION_ADAPT_STRUCT_ASSOC_NAMED`), the
adapted view is placed in the namespace `boost::fusion::adapted`.
The sequence of `(member_typeN, member_nameN, key_typeN)`
triples declares the type, name and key type of each of the struct members
that are part of the sequence.

When member_typeN is omitted or set to auto, the type is
infered with Boost.TypeOf.

The macros should be used at global scope, and `struct_name` should be the fully
namespace qualified name of the struct to be converted.

[heading Header]

    #include <boost/fusion/adapted/struct/adapt_assoc_struct_named.hpp>
    #include <boost/fusion/include/adapt_assoc_struct_named.hpp>

[heading Example]
    namespace demo
    {
        struct employee
        {
            std::string name;
            int age;
        };
    }

    namespace keys
    {
        struct name;
        struct age;
    }

    // boost::fusion::adapted::adapted_employee is now a Fusion sequence
    // referring to demo::employee
    BOOST_FUSION_ADAPT_ASSOC_STRUCT_NAMED(
        demo::employee, adapted_employee,
        (name, keys::name)
        (age, keys::age))

    // Without BOOST_PP_VARIADICS support :
    BOOST_FUSION_ADAPT_ASSOC_STRUCT_NAMED(
        demo::employee, adapted_employee,
        (auto, name, keys::name)
        (auto, age, keys::age))

[endsect]

[section:adapt_adt BOOST_FUSION_ADAPT_ADT]

BOOST_FUSION_ADAPT_ADT is a macro than can be used to generate all the
necessary boilerplate to adapt an arbitrary class type as a model of
__random_access_sequence__.

[heading Synopsis]

    BOOST_FUSION_ADAPT_ADT(
        type_name,
        ([attribute_type0, attribute_const_type0,] get_expr0, set_expr0)
        ([attribute_type1, attribute_const_type1,] get_expr1, set_expr1)
        ...
        )

[heading Expression Semantics]

The above macro generates the necessary code to adapt `type_name`
as a model of __random_access_sequence__.
The sequence of
[^([attribute_type['N], attribute_const_type['N],] get_expr['N], set_expr['N])]
quadruples declares the types, const types, get-expressions and set-expressions
of the elements that are part of the adapted fusion sequence.
[^get_expr['N]] is the expression that is invoked to get the ['N]th element
of an instance of `type_name`. This expression may access a variable named
`obj` of type `type_name&` or `type_name const&` which represents the underlying
instance of `type_name`.
[^attribute_type['N]] and [^attribute_const_type['N]] may specify the types
that [^get_expr['N]] denotes to, when omitted the type is deduced from
[get_expr['N]] return type via BOOST_TYPEOF. On compiler missing support for
variadic macros auto can be used to avoid repeating the type.
[^set_expr['N]] is the expression that is invoked to set the ['N]th element
of an instance of `type_name`. This expression may access variables named
`obj` of type `type_name&`, which represent the corresponding instance of
`type_name`, and `val` of an arbitrary const-qualified reference template type
parameter `Val`, which represents the right operand of the assignment
expression.

The actual return type of fusion's intrinsic sequence access (meta-)functions
when in invoked with (an instance of) `type_name` is a proxy type.
This type is implicitly convertible to the attribute type via [^get_expr['N]] and
forwards assignment to the underlying element via [^set_expr['N]].
The value type (that is the type returned by __result_of_value_of__,
__result_of_value_at__ and __result_of_value_at_c__) of the ['N]th element
is [^attribute_type['N]] with const-qualifier and reference removed.

The macro should be used at global scope, and `type_name` should be the fully
namespace qualified name of the class type to be adapted.

[heading Header]

    #include <boost/fusion/adapted/adt/adapt_adt.hpp>
    #include <boost/fusion/include/adapt_adt.hpp>

[heading Example]
    namespace demo
    {
        struct employee
        {
        private:
            std::string name;
            int age;

        public:
            void set_name(std::string const& n)
            {
                name=n;
            }

            void set_age(int a)
            {
                age=a;
            }

            std::string const& get_name()const
            {
                return name;
            }

            int get_age()const
            {
                return age;
            }
        };
    }

    BOOST_FUSION_ADAPT_ADT(
        demo::employee,
        (obj.get_name(), obj.set_name(val))
        (obj.get_age(), obj.set_age(val)))

    demo::employee e;
    front(e)="Edward Norton";
    back(e)=41;
    //Prints 'Edward Norton is 41 years old'
    std::cout << e.get_name() << " is " << e.get_age() << " years old" << std::endl;

[heading See also]

__adt_attribute_proxy__

[endsect]

[section:adapt_tpl_adt BOOST_FUSION_ADAPT_TPL_ADT]

BOOST_FUSION_ADAPT_TPL_ADT is a macro than can be used to generate all the
necessary boilerplate to adapt an arbitrary template class type as a model of
__random_access_sequence__.

[heading Synopsis]

    BOOST_FUSION_ADAPT_TPL_ADT(
        (template_param0)(template_param1)...,
        (type_name) (specialization_param0)(specialization_param1)...,
        ([attribute_type0, attribute_const_type0,] get_expr0, set_expr0)
        ([attribute_type1, attribute_const_type1,] get_expr1, set_expr1)
        ...
        )

[heading Expression Semantics]

The above macro generates the necessary code to adapt `type_name`
or an arbitrary specialization of `type_name`
as a model of __random_access_sequence__.
The sequence `(template_param0)(template_param1)...` declares the names of
the template type parameters used.
The sequence `(specialization_param0)(specialization_param1)...`
declares the template parameters of the actual specialization of `type_name`
that is adapted as a fusion sequence.
The sequence of
[^(attribute_type['N], attribute_const_type['N], get_expr['N], set_expr['N])]
quadruples declares the types, const types, get-expressions and set-expressions
of the elements that are part of the adapted fusion sequence.
[^get_expr['N]] is the expression that is invoked to get the ['N]th element
of an instance of `type_name`. This expression may access a variable named
`obj` of type `type_name&` or `type_name const&` which represents the underlying
instance of `type_name`.
[^attribute_type['N]] and [^attribute_const_type['N]] may specify the types
that [^get_expr['N]] denotes to, when omitted the type is deduced from
[get_expr['N]] return type via BOOST_TYPEOF. On compiler missing support for
variadic macros auto can be used to avoid repeating the type.
[^set_expr['N]] is the expression that is invoked to set the ['N]th element
of an instance of `type_name`. This expression may access variables named
`obj` of type `type_name&`, which represent the corresponding instance of
`type_name`, and `val` of an arbitrary const-qualified reference template type
parameter `Val`, which represents the right operand of the assignment
expression.

The actual return type of fusion's intrinsic sequence access (meta-)functions
when in invoked with (an instance of) `type_name` is a proxy type.
This type is implicitly convertible to the attribute type via [^get_expr['N]] and
forwards assignment to the underlying element via [^set_expr['N]].
The value type (that is the type returned by __result_of_value_of__,
__result_of_value_at__ and __result_of_value_at_c__) of the ['N]th element
is [^attribute_type['N]] with const-qualifier and reference removed.

The macro should be used at global scope, and `type_name` should be the fully
namespace qualified name of the template class type to be adapted.

[heading Header]

    #include <boost/fusion/adapted/adt/adapt_adt.hpp>
    #include <boost/fusion/include/adapt_adt.hpp>

[heading Example]
    namespace demo
    {
		template<typename Name, typename Age>
        struct employee
        {
        private:
            Name name;
            Age age;

        public:
            void set_name(Name const& n)
            {
                name=n;
            }

            void set_age(Age const& a)
            {
                age=a;
            }

            Name const& get_name()const
            {
                return name;
            }

            Age const& get_age()const
            {
                return age;
            }
        };
    }

    BOOST_FUSION_ADAPT_TPL_ADT(
        (Name)(Age),
        (demo::employee) (Name)(Age),
        (Name const&, Name const&, obj.get_name(), obj.set_name(val))
        (Age const&, Age const&, obj.get_age(), obj.set_age(val)))

    demo::employee<std::string, int> e;
    boost::fusion::front(e)="Edward Norton";
    boost::fusion::back(e)=41;
    //Prints 'Edward Norton is 41 years old'
    std::cout << e.get_name() << " is " << e.get_age() << " years old" << std::endl;

[heading See also]

__adt_attribute_proxy__

[endsect]

[section:adapt_assoc_adt BOOST_FUSION_ADAPT_ASSOC_ADT]

BOOST_FUSION_ADAPT_ASSOC_ADT is a macro than can be used to generate all the
necessary boilerplate to adapt an arbitrary class type as a model of
__random_access_sequence__  and __associative_sequence__.

[heading Synopsis]

    BOOST_FUSION_ADAPT_ASSOC_ADT(
        type_name,
        ([attribute_type0, attribute_const_type0,] get_expr0, set_expr0, key_type0)
        ([attribute_type1, attribute_const_type1,] get_expr1, set_expr1, key_type1)
        ...
        )

[heading Expression Semantics]

The above macro generates the necessary code to adapt `type_name`
as a model of __random_access_sequence__ and __associative_sequence__.
The sequence of
[^(attribute_type['N], attribute_const_type['N], get_expr['N], set_expr['N], key_type['N])]
5-tuples declares the types, const types, get-expressions, set-expressions and key types
of the elements that are part of the adapted fusion sequence.
[^get_expr['N]] is the expression that is invoked to get the ['N]th element
of an instance of `type_name`. This expression may access a variable named
`obj` of type `type_name&` or `type_name const&` which represents the underlying
instance of `type_name`.
[^attribute_type['N]] and [^attribute_const_type['N]] may specify the types
that [^get_expr['N]] denotes to, when omitted the type is deduced from
[get_expr['N]] return type via BOOST_TYPEOF. On compiler missing support for
variadic macros auto can be used to avoid repeating the type.
[^set_expr['N]] is the expression that is invoked to set the ['N]th element
of an instance of `type_name`. This expression may access variables named
`obj` of type `type_name&`, which represent the corresponding instance of
`type_name`, and `val` of an arbitrary const-qualified reference template type
parameter `Val`, which represents the right operand of the assignment
expression.

The actual return type of fusion's intrinsic sequence access (meta-)functions
when in invoked with (an instance of) `type_name` is a proxy type.
This type is implicitly convertible to the attribute type via [^get_expr['N]] and
forwards assignment to the underlying element via [^set_expr['N]].
The value type (that is the type returned by __result_of_value_of__, __result_of_value_of_data__,
__result_of_value_at__, __result_of_value_at_c__ and __result_of_value_at_key__) of the ['N]th element
is [^attribute_type['N]] with const-qualifier and reference removed.

The macro should be used at global scope, and `type_name` should be the fully
namespace qualified name of the class type to be adapted.

[heading Header]

    #include <boost/fusion/adapted/adt/adapt_assoc_adt.hpp>
    #include <boost/fusion/include/adapt_assoc_adt.hpp>

[heading Example]
    namespace demo
    {
        struct employee
        {
        private:
            std::string name;
            int age;

        public:
            void set_name(std::string const& n)
            {
                name=n;
            }

            void set_age(int a)
            {
                age=a;
            }

            std::string const& get_name()const
            {
                return name;
            }

            int get_age()const
            {
                return age;
            }
        };
    }

    namespace keys
    {
        struct name;
        struct age;
    }

    BOOST_FUSION_ADAPT_ASSOC_ADT(
        demo::employee,
        (obj.get_name(), obj.set_name(val), keys::name)
        (obj.get_age(), obj.set_age(val), keys::age))

    demo::employee e;
    at_key<keys::name>(e)="Edward Norton";
    at_key<keys::age>(e)=41;
    //Prints 'Edward Norton is 41 years old'
    std::cout << e.get_name() << " is " << e.get_age() << " years old" << std::endl;

[heading See also]

__adt_attribute_proxy__

[endsect]

[section:adapt_assoc_tpl_adt BOOST_FUSION_ADAPT_ASSOC_TPL_ADT]

BOOST_FUSION_ADAPT_ASSOC_TPL_ADT is a macro than can be used to generate all the
necessary boilerplate to adapt an arbitrary template class type as a model of
__random_access_sequence__  and __associative_sequence__.

[heading Synopsis]

    BOOST_FUSION_ADAPT_ASSOC_TPL_ADT(
        (template_param0)(template_param1)...,
        (type_name) (specialization_param0)(specialization_param1)...,
        ([attribute_type0, attribute_const_type0,] get_expr0, set_expr0, key_type0)
        ([attribute_type1, attribute_const_type1,] get_expr1, set_expr1, key_type1)
        ...
        )

[heading Expression Semantics]

The above macro generates the necessary code to adapt `type_name`
or an arbitrary specialization of `type_name`
as a model of __random_access_sequence__ and __associative_sequence__.
The sequence `(template_param0)(template_param1)...` declares the names of
the template type parameters used.
The sequence `(specialization_param0)(specialization_param1)...`
declares the template parameters of the actual specialization of `type_name`
that is adapted as a fusion sequence.
The sequence of
[^([attribute_type['N], attribute_const_type['N],] get_expr['N], set_expr['N], key_type['N])]
5-tuples declares the types, const types, get-expressions, set-expressions and key types
of the elements that are part of the adapted fusion sequence.
[^get_expr['N]] is the expression that is invoked to get the ['N]th element
of an instance of `type_name`. This expression may access a variable named
`obj` of type `type_name&` or `type_name const&` which represents the underlying
instance of `type_name`.
[^attribute_type['N]] and [^attribute_const_type['N]] may specify the types
that [^get_expr['N]] denotes to, when omitted the type is deduced from
[get_expr['N]] return type via BOOST_TYPEOF. On compiler missing support for
variadic macros auto can be used to avoid repeating the type.
[^set_expr['N]] is the expression that is invoked to set the ['N]th element
of an instance of `type_name`. This expression may access variables named
`obj` of type `type_name&`, which represent the corresponding instance of
`type_name`, and `val` of an arbitrary const-qualified reference template type
parameter `Val`, which represents the right operand of the assignment
expression.

The actual return type of fusion's intrinsic sequence access (meta-)functions
when in invoked with (an instance of) `type_name` is a proxy type.
This type is implicitly convertible to the attribute type via [^get_expr['N]] and
forwards assignment to the underlying element via [^set_expr['N]].
The value type (that is the type returned by __result_of_value_of__, __result_of_value_of_data__,
__result_of_value_at__, __result_of_value_at_c__ and __result_of_value_at_key__) of the ['N]th element
is [^attribute_type['N]] with const-qualifier and reference removed.

The macro should be used at global scope, and `type_name` should be the fully
namespace qualified name of the template class type to be adapted.

[heading Header]

    #include <boost/fusion/adapted/adt/adapt_assoc_adt.hpp>
    #include <boost/fusion/include/adapt_assoc_adt.hpp>

[heading Example]
    namespace demo
    {
        template<typename Name, typename Age>
        struct employee
        {
        private:
            Name name;
            Age age;

        public:
            void set_name(Name const& n)
            {
                name=n;
            }

            void set_age(Age const& a)
            {
                age=a;
            }

            Name const& get_name()const
            {
                return name;
            }

            Age const& get_age()const
            {
                return age;
            }
        };
    }

    namespace keys
    {
        struct name;
        struct age;
    }

    BOOST_FUSION_ADAPT_ASSOC_TPL_ADT(
        (Name)(Age),
        (demo::employee) (Name)(Age),
        (Name const&, Name const&, obj.get_name(), obj.set_name(val), keys::name)
        (Age const&, Age const&, obj.get_age(), obj.set_age(val), keys::age))

    demo::employee<std::string, int> e;
    at_key<keys::name>(e)="Edward Norton";
    at_key<keys::age>(e)=41;
    //Prints 'Edward Norton is 41 years old'
    std::cout << e.get_name() << " is " << e.get_age() << " years old" << std::endl;

[heading See also]

__adt_attribute_proxy__

[endsect]

[section:define_struct BOOST_FUSION_DEFINE_STRUCT]

BOOST_FUSION_DEFINE_STRUCT is a macro that can be used to generate all the
necessary boilerplate to define and adapt an arbitrary struct as a model of
__random_access_sequence__.

[heading Synopsis]

    BOOST_FUSION_DEFINE_STRUCT(
        (namespace0)(namespace1)...,
        struct_name,
        (member_type0, member_name0)
        (member_type1, member_name1)
        ...
        )

[variablelist Notation
    [[`str`]            [An instance of `struct_name`]]
    [[`e0`...`en`]      [Heterogeneous values]]
    [[`fs`]             [A __forward_sequence__]]
]

[heading Expression Semantics]

The above macro generates the necessary code that defines and adapts `struct_name`
as a model of __random_access_sequence__.
The sequence `(namespace0)(namespace1)...` declares the namespace
for `struct_name`. It yields to a fully qualified name for `struct_name` of
`namespace0::namespace1::... struct_name`.
If an empty namespace sequence is given (that is a macro that expands to
nothing), the struct is placed in the global namespace.
The sequence of `(member_typeN, member_nameN)`
pairs declares the type and names of each of the struct members that are
part of the sequence.

The macro should be used at global scope.
Semantics of an expression is defined only where it differs from, or is not
defined in __random_access_sequence__.

[table
    [[Expression]                     [Semantics]]
    [[`struct_name()`]                [Creates an instance of `struct_name` with default constructed elements.]]
    [[`struct_name(e0, e1,... en)`]   [Creates an instance of `struct_name` with elements `e0`...`en`.]]
    [[`struct_name(fs)`]              [Copy constructs an instance of `struct_name` from a __forward_sequence__ `fs`.]]
    [[`str = fs`]                     [Assigns from a __forward_sequence__ `fs`.]]
    [[`str.member_nameN`]             [Access of struct member `member_nameN`]]
]

[heading Header]

    #include <boost/fusion/adapted/struct/define_struct.hpp>
    #include <boost/fusion/include/define_struct.hpp>

[heading Example]

    // demo::employee is a Fusion sequence
    BOOST_FUSION_DEFINE_STRUCT(
        (demo), employee,
        (std::string, name)
        (int, age))

[endsect]

[section:define_tpl_struct BOOST_FUSION_DEFINE_TPL_STRUCT]

[heading Description]

BOOST_FUSION_DEFINE_TPL_STRUCT is a macro that can be used to generate all the
necessary boilerplate to define and adapt an arbitrary template struct as a
model of __random_access_sequence__.

[heading Synopsis]

    BOOST_FUSION_DEFINE_TPL_STRUCT(
        (template_param0)(template_param1)...,
        (namespace0)(namespace1)...,
        struct_name,
        (member_type0, member_name0)
        (member_type1, member_name1)
        ...
        )

[variablelist Notation
    [[`Str`]            [An instantiated `struct_name`]]
    [[`str`]            [An instance of `Str`]]
    [[`e0`...`en`]      [Heterogeneous values]]
    [[`fs`]             [A __forward_sequence__]]
]

[heading Expression Semantics]

The above macro generates the necessary code that defines and adapts `struct_name`
as a model of __random_access_sequence__.
The sequence `(template_param0)(template_param1)...` declares the names of
the template type parameters used.
The sequence `(namespace0)(namespace1)...` declares the namespace
for `struct_name`. It yields to a fully qualified name for `struct_name` of
`namespace0::namespace1::... struct_name`.
If an empty namespace sequence is given (that is a macro that expands to
nothing), the struct is placed in the global namespace.
The sequence of `(member_typeN, member_nameN)`
pairs declares the type and names of each of the struct members that are
part of the sequence.

The macro should be used at global scope.
Semantics of an expression is defined only where it differs from, or is not
defined in __random_access_sequence__.

[table
    [[Expression]                     [Semantics]]
    [[`Str()`]                        [Creates an instance of `Str` with default constructed elements.]]
    [[`Str(e0, e1,... en)`]           [Creates an instance of `Str` with elements `e0`...`en`.]]
    [[`Str(fs)`]                      [Copy constructs an instance of `Str` from a __forward_sequence__ `fs`.]]
    [[`str = fs`]                     [Assigns from a __forward_sequence__ `fs`.]]
    [[`str.member_nameN`]             [Access of struct member `member_nameN`]]
]

[heading Header]

    #include <boost/fusion/adapted/struct/define_struct.hpp>
    #include <boost/fusion/include/define_struct.hpp>

[heading Example]

    // Any instantiated demo::employee is a Fusion sequence
    BOOST_FUSION_DEFINE_TPL_STRUCT(
        (Name)(Age), (demo), employee,
        (Name, name)
        (Age, age))

[endsect]

[section:define_struct_inline BOOST_FUSION_DEFINE_STRUCT_INLINE]

[heading Description]

BOOST_FUSION_DEFINE_STRUCT_INLINE is a macro that can be used to generate all
the necessary boilerplate to define and adapt an arbitrary struct as a model of
__random_access_sequence__. Unlike BOOST_FUSION_DEFINE_STRUCT, it can be used
at class or namespace scope.

[heading Synopsis]

    BOOST_FUSION_DEFINE_STRUCT_INLINE(
        struct_name,
        (member_type0, member_name0)
        (member_type1, member_name1)
        ...
        )

[heading Expression Semantics]

The semantics of BOOST_FUSION_DEFINE_STRUCT_INLINE are identical to those of
BOOST_FUSION_DEFINE_STRUCT, with two differences:

# BOOST_FUSION_DEFINE_STRUCT_INLINE can be used at class or namespace scope, and
  thus does not take a namespace list parameter.
# The structure generated by BOOST_FUSION_DEFINE_STRUCT_INLINE has a base class,
  and is thus not POD in C++03.

[heading Header]

    #include <boost/fusion/adapted/struct/define_struct_inline.hpp>
    #include <boost/fusion/include/define_struct_inline.hpp>

[heading Example]

    // enclosing::employee is a Fusion sequence
    class enclosing
    {
        BOOST_FUSION_DEFINE_STRUCT_INLINE(
            employee,
            (std::string, name)
            (int, age))
    };


[endsect]

[section:define_tpl_struct_inline BOOST_FUSION_DEFINE_TPL_STRUCT_INLINE]

[heading Description]

BOOST_FUSION_DEFINE_TPL_STRUCT_INLINE is a macro that can be used to generate
all the necessary boilerplate to define and adapt an arbitrary template struct
as a model of __random_access_sequence__. Unlike BOOST_FUSION_DEFINE_TPL_STRUCT,
it can be used at class or namespace scope.

[heading Synopsis]

    BOOST_FUSION_DEFINE_TPL_STRUCT_INLINE(
        (template_param0)(template_param1)...,
        struct_name,
        (member_type0, member_name0)
        (member_type1, member_name1)
        ...
        )

[heading Expression Semantics]

The semantics of BOOST_FUSION_DEFINE_TPL_STRUCT_INLINE are identical to those of
BOOST_FUSION_DEFINE_TPL_STRUCT, with two differences:

# BOOST_FUSION_DEFINE_TPL_STRUCT_INLINE can be used at class or namespace scope,
  and thus does not take a namespace list parameter.
# The structure generated by BOOST_FUSION_DEFINE_TPL_STRUCT_INLINE has a base
  class, and is thus not POD in C++03.

[heading Header]

    #include <boost/fusion/adapted/struct/define_struct_inline.hpp>
    #include <boost/fusion/include/define_struct_inline.hpp>

[heading Example]

    // Any instantiated enclosing::employee is a Fusion sequence
    class enclosing
    {
        BOOST_FUSION_DEFINE_TPL_STRUCT(
            (Name)(Age), employee,
            (Name, name)
            (Age, age))
    };

[endsect]

[section:define_assoc_struct BOOST_FUSION_DEFINE_ASSOC_STRUCT]

[heading Description]

BOOST_FUSION_DEFINE_ASSOC_STRUCT is a macro that can be used to generate all the
necessary boilerplate to define and adapt an arbitrary struct as a model of
__random_access_sequence__ and __associative_sequence__.

[heading Synopsis]

    BOOST_FUSION_DEFINE_ASSOC_STRUCT(
        (namespace0)(namespace1)...,
        struct_name,
        (member_type0, member_name0, key_type0)
        (member_type1, member_name1, key_type1)
        ...
        )

[variablelist Notation
    [[`str`]            [An instance of `struct_name`]]
    [[`e0`...`en`]      [Heterogeneous values]]
    [[`fs`]             [A __forward_sequence__]]
]

[heading Expression Semantics]

The above macro generates the necessary code that defines and adapts `struct_name`
as a model of __random_access_sequence__ and __associative_sequence__.
The sequence `(namespace0)(namespace1)...` declares the namespace
for `struct_name`. It yields to a fully qualified name for `struct_name` of
`namespace0::namespace1::... struct_name`.
If an empty namespace sequence is given (that is a macro that expands to
nothing), the struct is placed in the global namespace.
The sequence of `(member_typeN, member_nameN, key_typeN)`
triples declares the type, name and key type of each of the struct members
that are part of the sequence.

The macro should be used at global scope.
Semantics of an expression is defined only where it differs from, or is not
defined in __random_access_sequence__ and __associative_sequence__.

[table
    [[Expression]                     [Semantics]]
    [[`struct_name()`]                [Creates an instance of `struct_name` with default constructed elements.]]
    [[`struct_name(e0, e1,... en)`]   [Creates an instance of `struct_name` with elements `e0`...`en`.]]
    [[`struct_name(fs)`]              [Copy constructs an instance of `struct_name` from a __forward_sequence__ `fs`.]]
    [[`str = fs`]                     [Assigns from a __forward_sequence__ `fs`.]]
    [[`str.member_nameN`]             [Access of struct member `member_nameN`]]
]

[heading Header]

    #include <boost/fusion/adapted/struct/define_assoc_struct.hpp>
    #include <boost/fusion/include/define_assoc_struct.hpp>

[heading Example]

    namespace keys
    {
        struct name;
        struct age;
    }

    // demo::employee is a Fusion sequence
    BOOST_FUSION_DEFINE_ASSOC_STRUCT(
        (demo), employee,
        (std::string, name, keys::name)
        (int, age, keys::age))

[endsect]

[section:define_assoc_tpl_struct BOOST_FUSION_DEFINE_ASSOC_TPL_STRUCT]

[heading Description]

BOOST_FUSION_DEFINE_ASSOC_TPL_STRUCT is a macro that can be used to generate all
the necessary boilerplate to define and adapt an arbitrary template struct as a
model of __random_access_sequence__  and __associative_sequence__.

[heading Synopsis]

    BOOST_FUSION_DEFINE_ASSOC_TPL_STRUCT(
        (template_param0)(template_param1)...,
        (namespace0)(namespace1)...,
        struct_name,
        (member_type0, member_name0, key_type0)
        (member_type1, member_name1, key_type1)
        ...
        )

[variablelist Notation
    [[`Str`]            [An instantiated `struct_name`]]
    [[`str`]            [An instance of `Str`]]
    [[`e0`...`en`]      [Heterogeneous values]]
    [[`fs`]             [A __forward_sequence__]]
]

[heading Expression Semantics]

The above macro generates the necessary code that defines and adapts
`struct_name` as a model of __random_access_sequence__  and
__associative_sequence__.
The sequence `(template_param0)(template_param1)...` declares the names of
the template type parameters used.
The sequence `(namespace0)(namespace1)...` declares the namespace
for `struct_name`. It yields to a fully qualified name for `struct_name` of
`namespace0::namespace1::... struct_name`.
If an empty namespace sequence is given (that is a macro that expands to
nothing), the struct is placed in the global namespace.
The sequence of `(member_typeN, member_nameN, key_typeN)`
triples declares the type, name and key type of each of the struct members
that are part of the sequence.

The macro should be used at global scope.
Semantics of an expression is defined only where it differs from, or is not
defined in __random_access_sequence__ and __associative_sequence__.

[table
    [[Expression]                     [Semantics]]
    [[`Str()`]                        [Creates an instance of `Str` with default constructed elements.]]
    [[`Str(e0, e1,... en)`]           [Creates an instance of `Str` with elements `e0`...`en`.]]
    [[`Str(fs)`]                      [Copy constructs an instance of `Str` from a __forward_sequence__ `fs`.]]
    [[`str = fs`]                     [Assigns from a __forward_sequence__ `fs`.]]
    [[`str.member_nameN`]             [Access of struct member `member_nameN`]]
]

[heading Header]

    #include <boost/fusion/adapted/struct/define_assoc_struct.hpp>
    #include <boost/fusion/include/define_assoc_struct.hpp>

[heading Example]

    namespace keys
    {
        struct name;
        struct age;
    }

    // Any instantiated demo::employee is a Fusion sequence
    BOOST_FUSION_DEFINE_ASSOC_TPL_STRUCT(
        (Name)(Age), (demo), employee,
        (Name, name, keys::name)
        (Age, age, keys::age))

[endsect]

[endsect]