// 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/core/lightweight_test.hpp>
#include <functional>

struct X
{
    int m = -1;
};

struct Y: public virtual X
{
};

int main()
{
    {
        BOOST_TEST_EQ( boost::compat::bind_back( &X::m, X() )(), -1 );
    }

    {
        BOOST_TEST_EQ( boost::compat::bind_back( &X::m, Y() )(), -1 );
    }

    {
        X x;

        BOOST_TEST_EQ( boost::compat::bind_back( &X::m, x )(), -1 );
    }

    {
        X x;

        BOOST_TEST_EQ( boost::compat::bind_back( &X::m, &x )(), -1 );
        boost::compat::bind_back( &X::m, &x )() = +1;
        BOOST_TEST_EQ( boost::compat::bind_back( &X::m, &x )(), +1 );
    }

    {
        X x;

        BOOST_TEST_EQ( boost::compat::bind_back( &X::m, std::ref(x) )(), -1 );
        boost::compat::bind_back( &X::m, std::ref(x) )() = +1;
        BOOST_TEST_EQ( boost::compat::bind_back( &X::m, std::ref(x) )(), +1 );
    }

    {
        X x;

        BOOST_TEST_EQ( boost::compat::bind_back( &X::m, std::cref(x) )(), -1 );
    }

    {
        Y y;

        BOOST_TEST_EQ( boost::compat::bind_back( &X::m, y )(), -1 );
    }

    {
        Y y;

        BOOST_TEST_EQ( boost::compat::bind_back( &X::m, &y )(), -1 );
        boost::compat::bind_back( &X::m, &y )() = +1;
        BOOST_TEST_EQ( boost::compat::bind_back( &X::m, &y )(), +1 );
    }

    {
        Y y;

        BOOST_TEST_EQ( boost::compat::bind_back( &X::m, std::ref(y) )(), -1 );
        boost::compat::bind_back( &X::m, std::ref(y) )() = +1;
        BOOST_TEST_EQ( boost::compat::bind_back( &X::m, std::ref(y) )(), +1 );
    }

    {
        Y y;

        BOOST_TEST_EQ( boost::compat::bind_back( &X::m, std::cref(y) )(), -1 );
    }

    {
        X const x = {};

        BOOST_TEST_EQ( boost::compat::bind_back( &X::m, x )(), -1 );
        BOOST_TEST_EQ( boost::compat::bind_back( &X::m, &x )(), -1 );
        BOOST_TEST_EQ( boost::compat::bind_back( &X::m, std::ref(x) )(), -1 );
    }

    {
        Y const y = {};

        BOOST_TEST_EQ( boost::compat::bind_back( &X::m, y )(), -1 );
        BOOST_TEST_EQ( boost::compat::bind_back( &X::m, &y )(), -1 );
        BOOST_TEST_EQ( boost::compat::bind_back( &X::m, std::ref(y) )(), -1 );
    }

    return boost::report_errors();
}