xref: /llvm-project-15.0.7/libcxx/test/std/strings/basic.string/string.modifiers/string_append/string_view.pass.cpp (revision 1cf41139)

//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//

// <string>

// basic_string<charT,traits,Allocator>&
//   append(basic_string_view<charT,traits> sv); // constexpr since C++20

#include <string>
#include <string_view>
#include <cassert>

#include "test_macros.h"
#include "min_allocator.h"

template <class S, class SV>
TEST_CONSTEXPR_CXX20 void
test(S s, SV sv, S expected)
{
    s.append(sv);
    LIBCPP_ASSERT(s.__invariants());
    assert(s == expected);
}

TEST_CONSTEXPR_CXX20 bool test() {
  {
    typedef std::string S;
    typedef std::string_view SV;
    test(S(), SV(), S());
    test(S(), SV("12345"), S("12345"));
    test(S(), SV("1234567890"), S("1234567890"));
    test(S(), SV("12345678901234567890"), S("12345678901234567890"));

    test(S("12345"), SV(), S("12345"));
    test(S("12345"), SV("12345"), S("1234512345"));
    test(S("12345"), SV("1234567890"), S("123451234567890"));
    test(S("12345"), SV("12345678901234567890"), S("1234512345678901234567890"));

    test(S("1234567890"), SV(), S("1234567890"));
    test(S("1234567890"), SV("12345"), S("123456789012345"));
    test(S("1234567890"), SV("1234567890"), S("12345678901234567890"));
    test(S("1234567890"), SV("12345678901234567890"), S("123456789012345678901234567890"));

    test(S("12345678901234567890"), SV(), S("12345678901234567890"));
    test(S("12345678901234567890"), SV("12345"), S("1234567890123456789012345"));
    test(S("12345678901234567890"), SV("1234567890"), S("123456789012345678901234567890"));
    test(S("12345678901234567890"), SV("12345678901234567890"),
         S("1234567890123456789012345678901234567890"));
  }
#if TEST_STD_VER >= 11
  {
    typedef std::basic_string     <char, std::char_traits<char>, min_allocator<char>> S;
    typedef std::basic_string_view<char, std::char_traits<char> > SV;
    test(S(), SV(), S());
    test(S(), SV("12345"), S("12345"));
    test(S(), SV("1234567890"), S("1234567890"));
    test(S(), SV("12345678901234567890"), S("12345678901234567890"));

    test(S("12345"), SV(), S("12345"));
    test(S("12345"), SV("12345"), S("1234512345"));
    test(S("12345"), SV("1234567890"), S("123451234567890"));
    test(S("12345"), SV("12345678901234567890"), S("1234512345678901234567890"));

    test(S("1234567890"), SV(), S("1234567890"));
    test(S("1234567890"), SV("12345"), S("123456789012345"));
    test(S("1234567890"), SV("1234567890"), S("12345678901234567890"));
    test(S("1234567890"), SV("12345678901234567890"), S("123456789012345678901234567890"));

    test(S("12345678901234567890"), SV(), S("12345678901234567890"));
    test(S("12345678901234567890"), SV("12345"), S("1234567890123456789012345"));
    test(S("12345678901234567890"), SV("1234567890"), S("123456789012345678901234567890"));
    test(S("12345678901234567890"), SV("12345678901234567890"),
         S("1234567890123456789012345678901234567890"));
  }
#endif

  return true;
}

int main(int, char**)
{
  test();
#if TEST_STD_VER > 17
  static_assert(test());
#endif

  return 0;
}