sfinae.cpp
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// Boost.Convert test and usage example
// Copyright (c) 2009-2020 Vladimir Batov.
// Use, modification and distribution are subject to the Boost Software License,
// Version 1.0. See http://www.boost.org/LICENSE_1_0.txt.
#include "./test.hpp"
#if !defined(BOOST_CONVERT_CXX14)
int main(int, char const* []) { return 0; }
#else
#include <boost/convert.hpp>
#include <boost/convert/detail/is_string.hpp>
#include <boost/convert/detail/is_callable.hpp>
//[is_callable_declaration
namespace { namespace local
{
BOOST_DECLARE_IS_CALLABLE(can_call_funop, operator());
BOOST_DECLARE_IS_CALLABLE(can_call_func, func);
}}
//]
//[is_callable_classes_tested
namespace { namespace callable
{
struct test1 { int operator()(double, std::string) { return 0; }};
struct test2 { void operator()(double, std::string) {}};
struct test3 { void operator()(int) {}};
struct test4 { std::string operator()(int) const { return std::string(); }};
struct test5 { std::string operator()(int, std::string const& =std::string()) const { return std::string(); }};
struct test6 { template<typename T> std::string operator()(T) const { return std::string(); }};
struct test7 { template<typename T> T operator()(T) const { return T(); }};
struct test11 { int func(double, std::string) { return 0; }};
struct test12 { void func(double, std::string) {}};
struct test13 { void func(int) {}};
struct test14 { std::string func(int) const { return std::string(); }};
struct test15 { std::string func(int, std::string const& =std::string()) const { return std::string(); }};
struct test16 { template<typename T> std::string func(T) const { return std::string(); }};
struct test17 { template<typename T> T func(T) const { return T(); }};
}}
//]
static
void
test_is_callable()
{
// C1. Unfortunately, passing 'double' where 'int' is expected returns 'true'.
// The same as the following (which successfully compiles):
// void fun(int) {}
// fun(double(1));
//[is_callable_usage1
BOOST_TEST((local::can_call_funop<callable::test1, int (double, std::string)>::value == true));
BOOST_TEST((local::can_call_funop<callable::test1, double (int, std::string)>::value == true));
BOOST_TEST((local::can_call_funop<callable::test1, void (double, std::string)>::value == true));
BOOST_TEST((local::can_call_funop<callable::test1, void (int, std::string)>::value == true));
BOOST_TEST((local::can_call_funop<callable::test1, void (int, char const*)>::value == true));
BOOST_TEST((local::can_call_funop<callable::test1, int (double, int)>::value == false));
BOOST_TEST((local::can_call_funop<callable::test1, int (double)>::value == false));
BOOST_TEST((local::can_call_funop<callable::test2, int (double, std::string)>::value == false));
BOOST_TEST((local::can_call_funop<callable::test2, void (double, std::string)>::value == true));
BOOST_TEST((local::can_call_funop<callable::test2, void ( int, std::string)>::value == true));
BOOST_TEST((local::can_call_funop<callable::test2, void ( int, char const*)>::value == true));
//]
BOOST_TEST((local::can_call_funop<callable::test3, void (double)>::value == true)); //C1
BOOST_TEST((local::can_call_funop<callable::test3, void (int)>::value == true));
BOOST_TEST((local::can_call_funop<callable::test3 const, void (int)>::value == false));
BOOST_TEST((local::can_call_funop<callable::test4 const, std::string (int)>::value == true));
BOOST_TEST((local::can_call_funop<callable::test4, std::string (int)>::value == true));
BOOST_TEST((local::can_call_funop<callable::test4 const, void (int)>::value == true));
BOOST_TEST((local::can_call_funop<callable::test4, void (int)>::value == true));
BOOST_TEST((local::can_call_funop<callable::test5, std::string (int, std::string)>::value == true));
BOOST_TEST((local::can_call_funop<callable::test5, std::string (int, std::string const&)>::value == true));
BOOST_TEST((local::can_call_funop<callable::test5, void (int, char const*)>::value == true));
BOOST_TEST((local::can_call_funop<callable::test5, std::string (int)>::value == true));
BOOST_TEST((local::can_call_funop<callable::test5 const, std::string (int)>::value == true));
BOOST_TEST((local::can_call_funop<callable::test5, void (int)>::value == true));
BOOST_TEST((local::can_call_funop<callable::test5 const, void (int)>::value == true));
BOOST_TEST((local::can_call_funop<callable::test5, void (char const*)>::value == false));
BOOST_TEST((local::can_call_funop<callable::test5 const, void (char const*)>::value == false));
BOOST_TEST((local::can_call_funop<callable::test6, std::string (int)>::value == true));
BOOST_TEST((local::can_call_funop<callable::test6, std::string (std::string)>::value == true));
BOOST_TEST((local::can_call_funop<callable::test6, void (int)>::value == true));
BOOST_TEST((local::can_call_funop<callable::test6, void (std::string)>::value == true));
BOOST_TEST((local::can_call_funop<callable::test7, std::string (int)>::value == false));
BOOST_TEST((local::can_call_funop<callable::test7, std::string (std::string)>::value == true));
BOOST_TEST((local::can_call_funop<callable::test7, void (int)>::value == true));
BOOST_TEST((local::can_call_funop<callable::test7, void (std::string)>::value == true));
//[is_callable_usage2
BOOST_TEST((local::can_call_func<callable::test11, int (double, std::string)>::value == true));
BOOST_TEST((local::can_call_func<callable::test11, double (int, std::string)>::value == true));
BOOST_TEST((local::can_call_func<callable::test11, void (double, std::string)>::value == true));
BOOST_TEST((local::can_call_func<callable::test11, void (int, std::string)>::value == true));
BOOST_TEST((local::can_call_func<callable::test11, void (int, char const*)>::value == true));
BOOST_TEST((local::can_call_func<callable::test11, int (double, int)>::value == false));
BOOST_TEST((local::can_call_func<callable::test11, int (double)>::value == false));
BOOST_TEST((local::can_call_func<callable::test12, int (double, std::string)>::value == false));
BOOST_TEST((local::can_call_func<callable::test12, void (double, std::string)>::value == true));
BOOST_TEST((local::can_call_func<callable::test12, void ( int, std::string)>::value == true));
BOOST_TEST((local::can_call_func<callable::test12, void ( int, char const*)>::value == true));
//]
BOOST_TEST((local::can_call_func<callable::test13, void (double)>::value == true)); //C1
BOOST_TEST((local::can_call_func<callable::test13, void (int)>::value == true));
BOOST_TEST((local::can_call_func<callable::test13 const, void (int)>::value == false));
BOOST_TEST((local::can_call_func<callable::test14 const, std::string (int)>::value == true));
BOOST_TEST((local::can_call_func<callable::test14, std::string (int)>::value == true));
BOOST_TEST((local::can_call_func<callable::test14 const, void (int)>::value == true));
BOOST_TEST((local::can_call_func<callable::test14, void (int)>::value == true));
BOOST_TEST((local::can_call_func<callable::test15, std::string (int, std::string)>::value == true));
BOOST_TEST((local::can_call_func<callable::test15, std::string (int, std::string const&)>::value == true));
BOOST_TEST((local::can_call_func<callable::test15, void (int, char const*)>::value == true));
BOOST_TEST((local::can_call_func<callable::test15, std::string (int)>::value == true));
BOOST_TEST((local::can_call_func<callable::test15 const, std::string (int)>::value == true));
BOOST_TEST((local::can_call_func<callable::test15, void (int)>::value == true));
BOOST_TEST((local::can_call_func<callable::test15 const, void (int)>::value == true));
BOOST_TEST((local::can_call_func<callable::test15, void (char const*)>::value == false));
BOOST_TEST((local::can_call_func<callable::test15 const, void (char const*)>::value == false));
BOOST_TEST((local::can_call_func<callable::test16, std::string (int)>::value == true));
BOOST_TEST((local::can_call_func<callable::test16, std::string (std::string)>::value == true));
BOOST_TEST((local::can_call_func<callable::test16, void (int)>::value == true));
BOOST_TEST((local::can_call_func<callable::test16, void (std::string)>::value == true));
BOOST_TEST((local::can_call_func<callable::test17, std::string (int)>::value == false));
BOOST_TEST((local::can_call_func<callable::test17, std::string (std::string)>::value == true));
BOOST_TEST((local::can_call_func<callable::test17, void (int)>::value == true));
BOOST_TEST((local::can_call_func<callable::test17, void (std::string)>::value == true));
}
int
main(int, char const* [])
{
//[is_callable_usage
//]
test_is_callable();
BOOST_TEST(boost::cnv::is_string<direction>::value == false);
BOOST_TEST(boost::cnv::is_string<std::string>::value == true);
BOOST_TEST(boost::cnv::is_string<std::wstring>::value == true);
BOOST_TEST(boost::cnv::is_string<my_string>::value == true);
BOOST_TEST(boost::cnv::is_string<int>::value == false);
return boost::report_errors();
}
#endif