1
2 // Copyright (C) 2008-2018 Lorenzo Caminiti
3 // Distributed under the Boost Software License, Version 1.0 (see accompanying
4 // file LICENSE_1_0.txt or a copy at http://www.boost.org/LICENSE_1_0.txt).
5 // See: http://www.boost.org/doc/libs/release/libs/contract/doc/html/index.html
6
7 // Test call_if with true condition and void result type.
8
9 #include "../detail/oteststream.hpp"
10 #include <boost/contract/call_if.hpp>
11 #include <boost/bind.hpp>
12 #include <boost/type_traits/has_equal_to.hpp>
13 #include <boost/detail/lightweight_test.hpp>
14 #include <sstream>
15 #include <ios>
16
17 boost::contract::test::detail::oteststream out;
18
19 struct eq {
20 typedef void result_type; // Test void result type.
21
22 template<typename L, typename R>
operator ()eq23 result_type operator()(L left, R right) const {
24 out << (left == right) << std::endl; // Requires operator==.
25 }
26 };
27
28 struct x {}; // Doest not have operator==.
29
main()30 int main() {
31 std::ostringstream ok;
32 ok << std::boolalpha;
33 out << std::boolalpha;
34 x x1, x2;;
35
36 out.str("");
37 boost::contract::call_if<boost::has_equal_to<int> >(
38 boost::bind(eq(), 123, 456) // False.
39 ); // Test no else (not called).
40 ok.str(""); ok << false << std::endl;
41 BOOST_TEST(out.eq(ok.str()));
42
43 out.str("");
44 boost::contract::call_if<boost::has_equal_to<int> >(
45 boost::bind(eq(), 123, 123) // True.
46 ).else_(
47 [] { return false; }
48 ); // Test else (not called).
49 ok.str(""); ok << true << std::endl;
50 BOOST_TEST(out.eq(ok.str()));
51
52 out.str("");
53 // Test "..._c".
54 boost::contract::call_if_c<boost::has_equal_to<int>::value>(
55 boost::bind(eq(), 123, 123) // True.
56 ).else_( // Test else (not called).
57 boost::bind(eq(), x1, x2) // Compiler-error... but not called.
58 );
59 ok.str(""); ok << true << std::endl;
60 BOOST_TEST(out.eq(ok.str()));
61
62 return boost::report_errors();
63 }
64
65