//===----------------------------------------------------------------------===//
//
// 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, c++14, c++17, c++20, c++23
// <string>
// [string.op.plus]
//
// template<class charT, class traits, class Allocator>
// constexpr basic_string<charT, traits, Allocator>
// operator+(const basic_string<charT, traits, Allocator>& lhs,
// type_identity_t<basic_string_view<charT, traits>> rhs); // Since C++26
// template<class charT, class traits, class Allocator>
// constexpr basic_string<charT, traits, Allocator>
// operator+(basic_string<charT, traits, Allocator>&& lhs,
// type_identity_t<basic_string_view<charT, traits>> rhs); // Since C++26
// template<class charT, class traits, class Allocator>
// constexpr basic_string<charT, traits, Allocator>
// operator+(type_identity_t<basic_string_view<charT, traits>> lhs,
// const basic_string<charT, traits, Allocator>& rhs); // Since C++26
// template<class charT, class traits, class Allocator>
// constexpr basic_string<charT, traits, Allocator>
// operator+(type_identity_t<basic_string_view<charT, traits>> lhs,
// basic_string<charT, traits, Allocator>&& rhs); // Since C++26
#include <cassert>
#include <concepts>
#include <string>
#include <utility>
#include "asan_testing.h"
#include "constexpr_char_traits.h"
#include "make_string.h"
#include "min_allocator.h"
#include "test_allocator.h"
#include "test_macros.h"
template <typename CharT, class TraitsT = std::char_traits<CharT>>
class ConvertibleToStringView {
public:
constexpr explicit ConvertibleToStringView(const CharT* cs) : cs_{cs} {}
constexpr operator std::basic_string_view<CharT, TraitsT>() { return std::basic_string_view<CharT, TraitsT>(cs_); }
constexpr operator std::basic_string_view<CharT, TraitsT>() const {
return std::basic_string_view<CharT, TraitsT>(cs_);
}
private:
const CharT* cs_;
};
static_assert(std::constructible_from<std::basic_string_view<char>, const ConvertibleToStringView<char>>);
static_assert(std::convertible_to<const ConvertibleToStringView<char>, std::basic_string_view<char>>);
static_assert(std::constructible_from<std::basic_string_view<char>, ConvertibleToStringView<char>>);
static_assert(std::convertible_to<ConvertibleToStringView<char>, std::basic_string_view<char>>);
#define CS(S) MAKE_CSTRING(CharT, S)
template <template <typename, typename> typename StringViewT, typename CharT, typename TraitsT, typename AllocT>
constexpr void test(const CharT* x, const CharT* y, const CharT* expected) {
AllocT allocator;
// string& + string_view
{
std::basic_string<CharT, TraitsT, AllocT> st{x, allocator};
StringViewT<CharT, TraitsT> sv{y};
std::same_as<std::basic_string<CharT, TraitsT, AllocT>> decltype(auto) result = st + sv;
assert(result == expected);
assert(result.get_allocator() == allocator);
LIBCPP_ASSERT(is_string_asan_correct(st + sv));
}
// const string& + string_view
{
const std::basic_string<CharT, TraitsT, AllocT> st{x, allocator};
StringViewT<CharT, TraitsT> sv{y};
std::same_as<std::basic_string<CharT, TraitsT, AllocT>> decltype(auto) result = st + sv;
assert(result == expected);
assert(result.get_allocator() == allocator);
LIBCPP_ASSERT(is_string_asan_correct(st + sv));
}
// string&& + string_view
{
std::basic_string<CharT, TraitsT, AllocT> st{x, allocator};
StringViewT<CharT, TraitsT> sv{y};
std::same_as<std::basic_string<CharT, TraitsT, AllocT>> decltype(auto) result = std::move(st) + sv;
assert(result == expected);
assert(result.get_allocator() == allocator);
LIBCPP_ASSERT(is_string_asan_correct(std::move(st) + sv));
}
// string_view + string&
{
StringViewT<CharT, TraitsT> sv{x};
std::basic_string<CharT, TraitsT, AllocT> st{y, allocator};
std::same_as<std::basic_string<CharT, TraitsT, AllocT>> decltype(auto) result = sv + st;
assert(result == expected);
assert(result.get_allocator() == allocator);
LIBCPP_ASSERT(is_string_asan_correct(sv + st));
}
// string_view + const string&
{
StringViewT<CharT, TraitsT> sv{x};
const std::basic_string<CharT, TraitsT, AllocT> st{y, allocator};
std::same_as<std::basic_string<CharT, TraitsT, AllocT>> decltype(auto) result = sv + st;
assert(result == expected);
assert(result.get_allocator() == allocator);
LIBCPP_ASSERT(is_string_asan_correct(sv + st));
}
// string_view + string&&
{
// TODO: Remove workaround once https://github.com/llvm/llvm-project/issues/92382 is fixed.
// Create a `basic_string` to workaround clang bug:
// https://github.com/llvm/llvm-project/issues/92382
// Comparison between pointers to a string literal and some other object results in constant evaluation failure.
if constexpr (std::same_as<StringViewT<CharT, TraitsT>, std::basic_string_view<CharT, TraitsT>>) {
std::basic_string<CharT, TraitsT, AllocT> st_{x, allocator};
StringViewT<CharT, TraitsT> sv{st_};
std::basic_string<CharT, TraitsT, AllocT> st{y, allocator};
std::same_as<std::basic_string<CharT, TraitsT, AllocT>> decltype(auto) result = sv + std::move(st);
assert(result == expected);
assert(result.get_allocator() == allocator);
LIBCPP_ASSERT(is_string_asan_correct(sv + std::move(st)));
}
}
}
template <template <typename, typename> typename StringViewT,
typename CharT,
typename TraitsT,
typename AllocT = std::allocator<CharT>>
constexpr void test() {
// Concatenate with an empty `string`/`string_view`
test<StringViewT, CharT, TraitsT, AllocT>(CS(""), CS(""), CS(""));
test<StringViewT, CharT, TraitsT, AllocT>(CS(""), CS("short"), CS("short"));
test<StringViewT, CharT, TraitsT, AllocT>(CS(""), CS("not so short"), CS("not so short"));
test<StringViewT, CharT, TraitsT, AllocT>(
CS(""), CS("this is a much longer string"), CS("this is a much longer string"));
test<StringViewT, CharT, TraitsT, AllocT>(CS(""), CS(""), CS(""));
test<StringViewT, CharT, TraitsT, AllocT>(CS("short"), CS(""), CS("short"));
test<StringViewT, CharT, TraitsT, AllocT>(CS("not so short"), CS(""), CS("not so short"));
test<StringViewT, CharT, TraitsT, AllocT>(
CS("this is a much longer string"), CS(""), CS("this is a much longer string"));
// Non empty
test<StringViewT, CharT, TraitsT, AllocT>(CS("B"), CS("D"), CS("BD"));
test<StringViewT, CharT, TraitsT, AllocT>(CS("zmt94"), CS("+hkt82"), CS("zmt94+hkt82"));
test<StringViewT, CharT, TraitsT, AllocT>(CS("not so short"), CS("+is not bad"), CS("not so short+is not bad"));
test<StringViewT, CharT, TraitsT, AllocT>(
CS("this is a much longer string"),
CS("+which is so much better"),
CS("this is a much longer string+which is so much better"));
}
template <template <typename, typename> typename StringViewT, typename CharT>
constexpr bool test() {
test<StringViewT, CharT, std::char_traits<CharT>>();
test<StringViewT, CharT, std::char_traits<CharT>, min_allocator<CharT>>();
test<StringViewT, CharT, std::char_traits<CharT>, safe_allocator<CharT>>();
test<StringViewT, CharT, std::char_traits<CharT>, test_allocator<CharT>>();
test<StringViewT, CharT, constexpr_char_traits<CharT>>();
test<StringViewT, CharT, constexpr_char_traits<CharT>, min_allocator<CharT>>();
test<StringViewT, CharT, constexpr_char_traits<CharT>, safe_allocator<CharT>>();
test<StringViewT, CharT, constexpr_char_traits<CharT>, test_allocator<CharT>>();
return true;
}
int main(int, char**) {
// std::basic_string_view
test<std::basic_string_view, char>();
static_assert(test<std::basic_string_view, char>());
#ifndef TEST_HAS_NO_WIDE_CHARACTERS
test<std::basic_string_view, wchar_t>();
static_assert(test<std::basic_string_view, wchar_t>());
#endif
#ifndef TEST_HAS_NO_CHAR8_T
test<std::basic_string_view, char8_t>();
static_assert(test<std::basic_string_view, char8_t>());
#endif
test<std::basic_string_view, char16_t>();
static_assert(test<std::basic_string_view, char16_t>());
test<std::basic_string_view, char32_t>();
static_assert(test<std::basic_string_view, char32_t>());
// ConvertibleToStringView
test<ConvertibleToStringView, char>();
static_assert(test<ConvertibleToStringView, char>());
#ifndef TEST_HAS_NO_WIDE_CHARACTERS
test<ConvertibleToStringView, wchar_t>();
static_assert(test<ConvertibleToStringView, wchar_t>());
#endif
#ifndef TEST_HAS_NO_CHAR8_T
test<ConvertibleToStringView, char8_t>();
static_assert(test<ConvertibleToStringView, char8_t>());
#endif
test<ConvertibleToStringView, char16_t>();
static_assert(test<ConvertibleToStringView, char16_t>());
test<ConvertibleToStringView, char32_t>();
static_assert(test<ConvertibleToStringView, char32_t>());
return 0;
}
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