starts_with.ptr.pass.cpp
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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++98, 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 sv3 { s, 3 };
// SV sv4 { s, 4 };
// SV sv5 { s, 5 };
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 sv3 { s, 3 };
// constexpr SV sv4 { s, 4 };
// constexpr SV sv5 { s, 5 };
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;
}