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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
//
//===----------------------------------------------------------------------===//
// REQUIRES: std-at-least-c++26
// <string_view>
// constexpr basic_string_view subview(size_type pos = 0,
// size_type n = npos) const; // freestanding-deleted
#include <cassert>
#include <concepts>
#include <string_view>
#include <utility>
#include "constexpr_char_traits.h"
#include "make_string.h"
#include "test_macros.h"
#include "type_algorithms.h"
#define CS(S) MAKE_CSTRING(CharT, S)
template <typename CharT, typename TraitsT>
constexpr void test() {
std::basic_string_view<CharT, TraitsT> sv{CS("Hello cruel world!")};
{ // With a default position and a character length.
// Check if subview() is a const-qualified.
assert(std::as_const(sv).subview() == CS("Hello cruel world!"));
// Check if the return type of subview() is correct.
std::same_as<std::basic_string_view<CharT, TraitsT>> decltype(auto) subsv = sv.subview();
assert(subsv == CS("Hello cruel world!"));
}
{ // Check with different position and length.
// With a explict position and a character length.
assert(sv.subview(6, 5) == CS("cruel"));
// From the beginning of the string with a explicit character length.
assert(sv.subview(0, 5) == CS("Hello"));
// To the end of string with the default character length.
assert(sv.subview(12) == CS("world!"));
// From the beginning to the end of the string with explicit values.
assert(sv.subview(0, sv.size()) == CS("Hello cruel world!"));
}
// Test if exceptions are thrown correctly.
#ifndef TEST_HAS_NO_EXCEPTIONS
if (!std::is_constant_evaluated()) {
{ // With a position that is out of range.
try {
std::ignore = sv.subview(sv.size() + 1);
assert(false);
} catch ([[maybe_unused]] const std::out_of_range& ex) {
LIBCPP_ASSERT(std::string(ex.what()) == "string_view::substr");
} catch (...) {
assert(false);
}
}
{ // With a position that is out of range and a 0 character length.
try {
std::ignore = sv.subview(sv.size() + 1, 0);
assert(false);
} catch ([[maybe_unused]] const std::out_of_range& ex) {
LIBCPP_ASSERT(std::string(ex.what()) == "string_view::substr");
} catch (...) {
assert(false);
}
}
{ // With a position that is out of range and a some character length.
try {
std::ignore = sv.subview(sv.size() + 1, 1);
assert(false);
} catch ([[maybe_unused]] const std::out_of_range& ex) {
LIBCPP_ASSERT(std::string(ex.what()) == "string_view::substr");
} catch (...) {
assert(false);
}
}
}
#endif
}
template <typename CharT>
constexpr void test() {
test<CharT, std::char_traits<CharT>>();
test<CharT, std::char_traits<CharT>>();
test<CharT, std::char_traits<CharT>>();
test<CharT, std::char_traits<CharT>>();
test<CharT, constexpr_char_traits<CharT>>();
test<CharT, constexpr_char_traits<CharT>>();
test<CharT, constexpr_char_traits<CharT>>();
test<CharT, constexpr_char_traits<CharT>>();
}
constexpr bool test() {
types::for_each(types::character_types(), []<typename CharT> { test<CharT>(); });
return true;
}
int main(int, char**) {
test();
static_assert(test());
return 0;
}
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