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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: !stdlib=libc++ && (c++03 || c++11 || c++14)
// <string_view>
// constexpr const_iterator begin() const;
#include <string_view>
#include <cassert>
#include "test_macros.h"
template <class S>
void test(S s) {
const S& cs = s;
typename S::iterator b = s.begin();
typename S::const_iterator cb1 = cs.begin();
typename S::const_iterator cb2 = s.cbegin();
if (!s.empty()) {
assert(*b == s[0]);
assert(&*b == &s[0]);
assert(*cb1 == s[0]);
assert(&*cb1 == &s[0]);
assert(*cb2 == s[0]);
assert(&*cb2 == &s[0]);
}
assert(b == cb1);
assert(b == cb2);
assert(cb1 == cb2);
}
int main(int, char**) {
typedef std::string_view string_view;
#ifndef TEST_HAS_NO_CHAR8_T
typedef std::u8string_view u8string_view;
#endif
typedef std::u16string_view u16string_view;
typedef std::u32string_view u32string_view;
test(string_view());
test(u16string_view());
test(u32string_view());
test(string_view("123"));
#ifndef TEST_HAS_NO_CHAR8_T
test(u8string_view{u8"123"});
#endif
#if TEST_STD_VER >= 11
test(u16string_view{u"123"});
test(u32string_view{U"123"});
#endif
#ifndef TEST_HAS_NO_WIDE_CHARACTERS
typedef std::wstring_view wstring_view;
test(wstring_view());
test(wstring_view(L"123"));
#endif
#if TEST_STD_VER > 11
{
constexpr string_view sv{"123", 3};
# ifndef TEST_HAS_NO_CHAR8_T
constexpr u8string_view u8sv{u8"123", 3};
# endif
constexpr u16string_view u16sv{u"123", 3};
constexpr u32string_view u32sv{U"123", 3};
static_assert(*sv.begin() == sv[0], "");
# ifndef TEST_HAS_NO_CHAR8_T
static_assert(*u8sv.begin() == u8sv[0], "");
# endif
static_assert(*u16sv.begin() == u16sv[0], "");
static_assert(*u32sv.begin() == u32sv[0], "");
static_assert(*sv.cbegin() == sv[0], "");
# ifndef TEST_HAS_NO_CHAR8_T
static_assert(*u8sv.cbegin() == u8sv[0], "");
# endif
static_assert(*u16sv.cbegin() == u16sv[0], "");
static_assert(*u32sv.cbegin() == u32sv[0], "");
# ifndef TEST_HAS_NO_WIDE_CHARACTERS
{
constexpr wstring_view wsv{L"123", 3};
static_assert(*wsv.begin() == wsv[0], "");
static_assert(*wsv.cbegin() == wsv[0], "");
}
# endif
}
#endif // TEST_STD_VER > 11
return 0;
}
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