//===----------------------------------------------------------------------===//
//
// 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, c++20

// <string_view>

//   constexpr bool contains(const CharT *x) const;

#include <string_view>
#include <cassert>

#include "test_macros.h"

constexpr bool test()
{
    using SV = std::string_view;

    const char* s = "abcde";
    SV sv0;
    SV sv1 {s + 4, 1};
    SV sv3 {s + 2, 3};
    SV svNot {"xyz", 3};

    assert( sv0.contains(""));
    assert(!sv0.contains("e"));

    assert( sv1.contains(""));
    assert(!sv1.contains("d"));
    assert( sv1.contains("e"));
    assert(!sv1.contains("de"));
    assert(!sv1.contains("cd"));
    assert(!sv1.contains("cde"));
    assert(!sv1.contains("bcde"));
    assert(!sv1.contains("abcde"));
    assert(!sv1.contains("xyz"));

    assert( sv3.contains(""));
    assert( sv3.contains("d"));
    assert( sv3.contains("e"));
    assert( sv3.contains("de"));
    assert( sv3.contains("cd"));
    assert(!sv3.contains("ce"));
    assert( sv3.contains("cde"));
    assert(!sv3.contains("edc"));
    assert(!sv3.contains("bcde"));
    assert(!sv3.contains("abcde"));
    assert(!sv3.contains("xyz"));

    assert( svNot.contains(""));
    assert(!svNot.contains("d"));
    assert(!svNot.contains("e"));
    assert(!svNot.contains("de"));
    assert(!svNot.contains("cd"));
    assert(!svNot.contains("cde"));
    assert(!svNot.contains("bcde"));
    assert(!svNot.contains("abcde"));
    assert( svNot.contains("xyz"));
    assert(!svNot.contains("zyx"));

    return true;
}

int main(int, char**)
{
    test();
    static_assert(test());

    return 0;
}