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//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
// <string>
// template<class charT, class traits, class Allocator>
// basic_string<charT,traits,Allocator>
// operator+(charT lhs, const basic_string<charT,traits,Allocator>& rhs); // constexpr since C++20
// template<class charT, class traits, class Allocator>
// basic_string<charT,traits,Allocator>&&
// operator+(charT lhs, basic_string<charT,traits,Allocator>&& rhs); // constexpr since C++20
#include <string>
#include <utility>
#include <cassert>
#include "test_macros.h"
#include "min_allocator.h"
template <class S>
TEST_CONSTEXPR_CXX20 void test0(typename S::value_type lhs, const S& rhs, const S& x) {
assert(lhs + rhs == x);
}
#if TEST_STD_VER >= 11
template <class S>
TEST_CONSTEXPR_CXX20 void test1(typename S::value_type lhs, S&& rhs, const S& x) {
assert(lhs + std::move(rhs) == x);
}
#endif
TEST_CONSTEXPR_CXX20 bool test() {
{
typedef std::string S;
test0('a', S(""), S("a"));
test0('a', S("12345"), S("a12345"));
test0('a', S("1234567890"), S("a1234567890"));
test0('a', S("12345678901234567890"), S("a12345678901234567890"));
}
#if TEST_STD_VER >= 11
{
typedef std::string S;
test1('a', S(""), S("a"));
test1('a', S("12345"), S("a12345"));
test1('a', S("1234567890"), S("a1234567890"));
test1('a', S("12345678901234567890"), S("a12345678901234567890"));
}
{
typedef std::basic_string<char, std::char_traits<char>,
min_allocator<char> >
S;
test0('a', S(""), S("a"));
test0('a', S("12345"), S("a12345"));
test0('a', S("1234567890"), S("a1234567890"));
test0('a', S("12345678901234567890"), S("a12345678901234567890"));
test1('a', S(""), S("a"));
test1('a', S("12345"), S("a12345"));
test1('a', S("1234567890"), S("a1234567890"));
test1('a', S("12345678901234567890"), S("a12345678901234567890"));
}
#endif
return true;
}
int main(int, char**) {
test();
#if TEST_STD_VER > 17
static_assert(test());
#endif
return 0;
}
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