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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>
// constexpr bool starts_with(string_view x) const noexcept;
#include <string_view>
#include <cassert>
#include "test_macros.h"
#include "constexpr_char_traits.h"
int main(int, char**) {
{
typedef std::string_view SV;
const char* s = "abcde";
SV sv0{};
SV sv1{s, 1};
SV sv2{s, 2};
SV svNot{"def", 3};
LIBCPP_ASSERT_NOEXCEPT(sv0.starts_with(""));
assert(sv0.starts_with(""));
assert(!sv0.starts_with("a"));
assert(sv1.starts_with(""));
assert(sv1.starts_with("a"));
assert(!sv1.starts_with("ab"));
assert(!sv1.starts_with("abc"));
assert(!sv1.starts_with("abcd"));
assert(!sv1.starts_with("abcde"));
assert(!sv1.starts_with("def"));
assert(sv2.starts_with(s + 5));
assert(sv2.starts_with("a"));
assert(sv2.starts_with("ab"));
assert(!sv2.starts_with("abc"));
assert(!sv2.starts_with("abcd"));
assert(!sv2.starts_with("abcde"));
assert(!sv2.starts_with("def"));
assert(svNot.starts_with(""));
assert(!svNot.starts_with("a"));
assert(!svNot.starts_with("ab"));
assert(!svNot.starts_with("abc"));
assert(!svNot.starts_with("abcd"));
assert(!svNot.starts_with("abcde"));
assert(svNot.starts_with("def"));
}
#if TEST_STD_VER > 11
{
typedef std::basic_string_view<char, constexpr_char_traits<char>> SV;
constexpr const char* s = "abcde";
constexpr SV sv0{};
constexpr SV sv1{s, 1};
constexpr SV sv2{s, 2};
constexpr SV svNot{"def", 3};
static_assert(sv0.starts_with(""), "");
static_assert(!sv0.starts_with("a"), "");
static_assert(sv1.starts_with(""), "");
static_assert(sv1.starts_with("a"), "");
static_assert(!sv1.starts_with("ab"), "");
static_assert(!sv1.starts_with("abc"), "");
static_assert(!sv1.starts_with("abcd"), "");
static_assert(!sv1.starts_with("abcde"), "");
static_assert(!sv1.starts_with("def"), "");
static_assert(sv2.starts_with(s + 5), "");
static_assert(sv2.starts_with("a"), "");
static_assert(sv2.starts_with("ab"), "");
static_assert(!sv2.starts_with("abc"), "");
static_assert(!sv2.starts_with("abcd"), "");
static_assert(!sv2.starts_with("abcde"), "");
static_assert(!sv2.starts_with("def"), "");
static_assert(svNot.starts_with(""), "");
static_assert(!svNot.starts_with("a"), "");
static_assert(!svNot.starts_with("ab"), "");
static_assert(!svNot.starts_with("abc"), "");
static_assert(!svNot.starts_with("abcd"), "");
static_assert(!svNot.starts_with("abcde"), "");
static_assert(svNot.starts_with("def"), "");
}
#endif
return 0;
}
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