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// Copyright 2024 Peter Dimov
// Distributed under the Boost Software License, Version 1.0.
// https://www.boost.org/LICENSE_1_0.txt
#include <boost/compat/bind_back.hpp>
#include <boost/config.hpp>
#include <boost/config/pragma_message.hpp>
#if defined(BOOST_NO_CXX14_CONSTEXPR)
BOOST_PRAGMA_MESSAGE( "Test skipped because BOOST_NO_CXX14_CONSTEXPR is defined" )
int main() {}
#else
#define STATIC_ASSERT(...) static_assert(__VA_ARGS__, #__VA_ARGS__)
#define BOOST_TEST_EQ(x, y) STATIC_ASSERT((x) == (y))
struct F1
{
constexpr int operator()()
{
return -1;
}
constexpr int operator()( int x1 ) noexcept
{
return x1;
}
constexpr int operator()( int x1, int x2 ) const
{
return 10*x1+x2;
}
constexpr int operator()( int x1, int x2, int x3 ) const noexcept
{
return 100*x1 + 10*x2 + x3;
}
};
struct F2
{
constexpr int operator()( int x1, int x2 ) &
{
return 100*x1 + 10*x2 + 1;
}
constexpr int operator()( int x1, int x2 ) const &
{
return 100*x1 + 10*x2 + 2;
}
constexpr int operator()( int x1, int x2 ) &&
{
return 100*x1 + 10*x2 + 3;
}
constexpr int operator()( int x1, int x2 ) const &&
{
return 100*x1 + 10*x2 + 4;
}
};
int main()
{
{
BOOST_TEST_EQ( boost::compat::bind_back( F1() )(), -1 );
BOOST_TEST_EQ( boost::compat::bind_back( F1() )( 1 ), 1 );
BOOST_TEST_EQ( boost::compat::bind_back( F1() )( 1, 2 ), 12 );
BOOST_TEST_EQ( boost::compat::bind_back( F1() )( 1, 2, 3 ), 123 );
BOOST_TEST_EQ( boost::compat::bind_back( F1(), 1 )(), 1 );
BOOST_TEST_EQ( boost::compat::bind_back( F1(), 1 )( 2 ), 21 );
BOOST_TEST_EQ( boost::compat::bind_back( F1(), 1 )( 2, 3 ), 231 );
BOOST_TEST_EQ( boost::compat::bind_back( F1(), 1, 2 )(), 12 );
BOOST_TEST_EQ( boost::compat::bind_back( F1(), 1, 2 )( 3 ), 312 );
BOOST_TEST_EQ( boost::compat::bind_back( F1(), 1, 2, 3 )(), 123 );
}
{
BOOST_TEST_EQ( boost::compat::bind_back( F2(), 9 )( 8 ), 893 );
}
{
constexpr auto fn = boost::compat::bind_back( F2(), 9 );
BOOST_TEST_EQ( fn( 8 ), 892 );
}
{
constexpr auto fn = boost::compat::bind_back( F2(), 9 );
BOOST_TEST_EQ( std::move( fn )( 8 ), 894 );
}
}
#endif
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