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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
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17
// <string_view>
// template <class It, class End>
// constexpr basic_string_view(It begin, End end)
#include <string_view>
#include <cassert>
#include <iterator>
#include "make_string.h"
#include "test_iterators.h"
template <class It, class Sentinel, class CharT>
constexpr void test_construction(std::basic_string_view<CharT> val) {
auto sv = std::basic_string_view<CharT>(It(val.data()), Sentinel(It(val.data() + val.size())));
assert(sv.data() == val.data());
assert(sv.size() == val.size());
}
template <class CharT>
constexpr void test_with_char() {
const auto val = MAKE_STRING_VIEW(CharT, "test");
test_construction<CharT*, CharT*>(val);
test_construction<CharT*, const CharT*>(val);
test_construction<const CharT*, CharT*>(val);
test_construction<const CharT*, sized_sentinel<const CharT*>>(val);
test_construction<contiguous_iterator<const CharT*>, contiguous_iterator<const CharT*>>(val);
test_construction<contiguous_iterator<const CharT*>, sized_sentinel<contiguous_iterator<const CharT*>>>(val);
}
constexpr bool test() {
test_with_char<char>();
#ifndef TEST_HAS_NO_WIDE_CHARACTERS
test_with_char<wchar_t>();
#endif
test_with_char<char8_t>();
test_with_char<char16_t>();
test_with_char<char32_t>();
return true;
}
#ifndef TEST_HAS_NO_EXCEPTIONS
template <class CharT>
struct ThrowingSentinel {
friend bool operator==(const CharT*, ThrowingSentinel) noexcept { return true; }
friend std::iter_difference_t<const CharT*> operator-(const CharT*, ThrowingSentinel) noexcept { return {}; }
friend std::iter_difference_t<const CharT*> operator-(ThrowingSentinel, const CharT*) { throw 42; }
};
template <class CharT>
void test_throwing() {
auto val = MAKE_STRING_VIEW(CharT, "test");
try {
(void)std::basic_string_view<CharT>(val.data(), ThrowingSentinel<CharT>());
assert(false);
} catch (int i) {
assert(i == 42);
}
}
void test_throwing() {
test_throwing<char>();
# ifndef TEST_HAS_NO_WIDE_CHARACTERS
test_throwing<wchar_t>();
# endif
test_throwing<char8_t>();
test_throwing<char16_t>();
test_throwing<char32_t>();
}
#endif
static_assert(std::is_constructible_v<std::string_view, const char*, char*>);
static_assert(std::is_constructible_v<std::string_view, char*, const char*>);
static_assert(!std::is_constructible_v<std::string_view, char*, void*>); // not a sentinel
static_assert(!std::is_constructible_v<std::string_view, signed char*, signed char*>); // wrong char type
static_assert(!std::is_constructible_v<std::string_view,
random_access_iterator<char*>,
random_access_iterator<char*>>); // not contiguous
static_assert(std::is_constructible_v<std::string_view, contiguous_iterator<char*>, contiguous_iterator<char*>>);
int main(int, char**) {
test();
static_assert(test());
#ifndef TEST_HAS_NO_EXCEPTIONS
test_throwing();
#endif
return 0;
}
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