container_hash/test/hash_unordered_map_test.cpp

// Copyright 2021, 2022 Peter Dimov.
// Distributed under the Boost Software License, Version 1.0.
// https://www.boost.org/LICENSE_1_0.txt

#if defined(__GNUC__) && __GNUC__ == 8
# pragma GCC diagnostic ignored "-Wsign-conversion"
#endif

#include <boost/container_hash/hash.hpp>
#include <boost/core/lightweight_test.hpp>
#include <boost/core/detail/splitmix64.hpp>
#include <boost/config.hpp>
#include <boost/config/pragma_message.hpp>

#if defined(BOOST_NO_CXX11_HDR_UNORDERED_MAP)

BOOST_PRAGMA_MESSAGE( "Test skipped, BOOST_NO_CXX11_HDR_UNORDERED_MAP is defined" )
int main() {}

#elif defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) && defined(_CPPLIB_VER) && _CPPLIB_VER >= 520

BOOST_PRAGMA_MESSAGE( "Test skipped, _CPPLIB_VER >= 520 and BOOST_NO_CXX11_VARIADIC_TEMPLATES is defined" )
int main() {}

#else

#include <unordered_map>

template<class T> std::size_t hv( T const& x )
{
    return boost::hash<T>()( x );
}

template<class T> void test()
{
    typedef std::unordered_map<T, T> set;

    int const N = 256;

    set v;

    boost::detail::splitmix64 rng;

    for( int i = 0; i < N; ++i )
    {
        BOOST_TEST_EQ( hv( v ), boost::hash_unordered_range( v.begin(), v.end() ) );

        T x = static_cast<T>( rng() );
        v.insert( std::pair<T const, T>( x, x ) );
    }
}

int main()
{
    test<unsigned>();
    test<boost::uint64_t>();
    test<float>();
    test<double>();

    return boost::report_errors();
}

#endif