//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

// UNSUPPORTED: c++03, c++11

#include <string>
#include <cassert>

#include "test_macros.h"

#if defined(__cpp_lib_char8_t) && __cpp_lib_char8_t >= 201811L
    typedef std::u8string u8string;
#else
    typedef std::string   u8string;
#endif

int main(int, char**) {
    {
        using namespace std::literals::string_literals;

        ASSERT_SAME_TYPE(decltype(  "Hi"s), std::string);
        ASSERT_SAME_TYPE(decltype(u8"Hi"s), u8string);
#ifndef TEST_HAS_NO_WIDE_CHARACTERS
        ASSERT_SAME_TYPE(decltype( L"Hi"s), std::wstring);
#endif
        ASSERT_SAME_TYPE(decltype( u"Hi"s), std::u16string);
        ASSERT_SAME_TYPE(decltype( U"Hi"s), std::u32string);

        std::string foo;
#ifndef TEST_HAS_NO_WIDE_CHARACTERS
        std::wstring Lfoo;
#endif
        u8string u8foo;
        std::u16string ufoo;
        std::u32string Ufoo;

        foo   =   ""s;     assert(  foo.size() == 0);
        u8foo = u8""s;     assert(u8foo.size() == 0);
#ifndef TEST_HAS_NO_WIDE_CHARACTERS
        Lfoo  =  L""s;     assert( Lfoo.size() == 0);
#endif
        ufoo  =  u""s;     assert( ufoo.size() == 0);
        Ufoo  =  U""s;     assert( Ufoo.size() == 0);

        foo   =   " "s;    assert(  foo.size() == 1);
        u8foo = u8" "s;    assert(u8foo.size() == 1);
#ifndef TEST_HAS_NO_WIDE_CHARACTERS
        Lfoo  =  L" "s;    assert( Lfoo.size() == 1);
#endif
        ufoo  =  u" "s;    assert( ufoo.size() == 1);
        Ufoo  =  U" "s;    assert( Ufoo.size() == 1);

        foo   =   "ABC"s;     assert(  foo ==   "ABC");   assert(  foo == std::string   (  "ABC"));
        u8foo = u8"ABC"s;     assert(u8foo == u8"ABC");   assert(u8foo == u8string      (u8"ABC"));
#ifndef TEST_HAS_NO_WIDE_CHARACTERS
        Lfoo  =  L"ABC"s;     assert( Lfoo ==  L"ABC");   assert( Lfoo == std::wstring  ( L"ABC"));
#endif
        ufoo  =  u"ABC"s;     assert( ufoo ==  u"ABC");   assert( ufoo == std::u16string( u"ABC"));
        Ufoo  =  U"ABC"s;     assert( Ufoo ==  U"ABC");   assert( Ufoo == std::u32string( U"ABC"));
    }
    {
        using namespace std::literals;
        std::string foo = ""s;
        assert(foo == std::string());
    }
    {
        using namespace std;
        std::string foo = ""s;
        assert(foo == std::string());
    }

    return 0;
}