1 // Boost noncopyable.hpp header file --------------------------------------// 2 3 // (C) Copyright Beman Dawes 1999-2003. Distributed under the Boost 4 // Software License, Version 1.0. (See accompanying file 5 // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) 6 7 // See http://www.boost.org/libs/utility for documentation. 8 9 #ifndef BOOST_CORE_NONCOPYABLE_HPP 10 #define BOOST_CORE_NONCOPYABLE_HPP 11 12 #include <boost/config.hpp> 13 14 namespace boost { 15 16 // Private copy constructor and copy assignment ensure classes derived from 17 // class noncopyable cannot be copied. 18 19 // Contributed by Dave Abrahams 20 21 namespace noncopyable_ // protection from unintended ADL 22 { 23 #ifndef BOOST_NONCOPYABLE_BASE_TOKEN_DEFINED 24 #define BOOST_NONCOPYABLE_BASE_TOKEN_DEFINED 25 26 // noncopyable derives from base_token to enable Type Traits to detect 27 // whether a type derives from noncopyable without needing the definition 28 // of noncopyable itself. 29 // 30 // The definition of base_token is macro-guarded so that Type Trais can 31 // define it locally without including this header, to avoid a dependency 32 // on Core. 33 34 struct base_token {}; 35 36 #endif // #ifndef BOOST_NONCOPYABLE_BASE_TOKEN_DEFINED 37 38 class noncopyable: base_token 39 { 40 protected: 41 #if !defined(BOOST_NO_CXX11_DEFAULTED_FUNCTIONS) && !defined(BOOST_NO_CXX11_NON_PUBLIC_DEFAULTED_FUNCTIONS) 42 BOOST_CONSTEXPR noncopyable() = default; 43 ~noncopyable() = default; 44 #else 45 noncopyable() {} 46 ~noncopyable() {} 47 #endif 48 #if !defined(BOOST_NO_CXX11_DELETED_FUNCTIONS) 49 noncopyable( const noncopyable& ) = delete; 50 noncopyable& operator=( const noncopyable& ) = delete; 51 #else 52 private: // emphasize the following members are private 53 noncopyable( const noncopyable& ); 54 noncopyable& operator=( const noncopyable& ); 55 #endif 56 }; 57 } 58 59 typedef noncopyable_::noncopyable noncopyable; 60 61 } // namespace boost 62 63 #endif // BOOST_CORE_NONCOPYABLE_HPP 64