test/std/strings/string.view/string.view.template/contains.string_view.pass.cpp

//===----------------------------------------------------------------------===//
//
// 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(string_view x) const noexcept;

#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 + 1, 1};
    SV sv2 {s + 1, 2};
    SV sv3 {s + 1, 3};
    SV sv4 {s + 1, 4};
    SV sv5 {s    , 5};
    SV svNot  {"xyz", 3};
    SV svNot2 {"bd" , 2};
    SV svNot3 {"dcb", 3};

    ASSERT_NOEXCEPT(sv0.contains(sv0));

    assert( sv0.contains(sv0));
    assert(!sv0.contains(sv1));

    assert( sv1.contains(sv0));
    assert( sv1.contains(sv1));
    assert(!sv1.contains(sv2));
    assert(!sv1.contains(sv3));
    assert(!sv1.contains(sv4));
    assert(!sv1.contains(sv5));
    assert(!sv1.contains(svNot));
    assert(!sv1.contains(svNot2));
    assert(!sv1.contains(svNot3));

    assert( sv3.contains(sv0));
    assert( sv3.contains(sv1));
    assert( sv3.contains(sv2));
    assert( sv3.contains(sv3));
    assert(!sv3.contains(sv4));
    assert(!sv3.contains(sv5));
    assert(!sv3.contains(svNot));
    assert(!sv3.contains(svNot2));
    assert(!sv3.contains(svNot3));

    assert( sv5.contains(sv0));
    assert( sv5.contains(sv1));
    assert( sv5.contains(sv2));
    assert( sv5.contains(sv3));
    assert( sv5.contains(sv4));
    assert( sv5.contains(sv5));
    assert(!sv5.contains(svNot));
    assert(!sv5.contains(svNot2));
    assert(!sv5.contains(svNot3));

    assert( svNot.contains(sv0));
    assert(!svNot.contains(sv1));
    assert(!svNot.contains(sv2));
    assert(!svNot.contains(sv3));
    assert(!svNot.contains(sv4));
    assert(!svNot.contains(sv5));
    assert( svNot.contains(svNot));
    assert(!svNot.contains(svNot2));
    assert(!svNot.contains(svNot3));

    return true;
}

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

    return 0;
}