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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 <cassert>
#include <string>
#include <utility>
#include "test_macros.h"
#include "min_allocator.h"
#include "asan_testing.h"
template <class S>
TEST_CONSTEXPR_CXX20 void test_string() {
const char* test_data[] = {"", "12345", "1234567890", "12345678901234567890"};
const char* results[] = {"a", "a12345", "a1234567890", "a12345678901234567890"};
for (size_t i = 0; i != 4; ++i) {
{ // operator+(value_type, const string&);
const S str(test_data[i]);
assert('a' + str == results[i]);
LIBCPP_ASSERT(is_string_asan_correct('a' + str));
}
#if TEST_STD_VER >= 11
{ // operator+(value_type, string&&);
S str(test_data[i]);
assert('a' + std::move(str) == results[i]);
}
#endif
}
}
TEST_CONSTEXPR_CXX20 bool test() {
test_string<std::string>();
#if TEST_STD_VER >= 11
test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
test_string<std::basic_string<char, std::char_traits<char>, safe_allocator<char> > >();
#endif
{ // check that growing to max_size() works
using string_type = std::basic_string<char, std::char_traits<char>, tiny_size_allocator<29, char> >;
string_type str;
str.resize(str.max_size() - 1);
string_type result = 'a' + str;
assert(result.size() == result.max_size());
assert(result.front() == 'a');
assert(result.capacity() <= result.get_allocator().max_size());
}
return true;
}
int main(int, char**) {
test();
#if TEST_STD_VER >= 20
static_assert(test());
#endif
return 0;
}
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