libcxx/test/std/strings/basic.string/string.modifiers/string_append/string_view.pass.cpp

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 // <string>
  10
  11 // basic_string<charT,traits,Allocator>&
  12 //   append(basic_string_view<charT,traits> sv); // constexpr since C++20
  13
  14 #include <string>
  15 #include <string_view>
  16 #include <cassert>
  17
  18 #include "test_macros.h"
  19 #include "min_allocator.h"
  20
  21 template <class S, class SV>
  22 TEST_CONSTEXPR_CXX20 void test(S s, SV sv, S expected) {
  23   s.append(sv);
  24   LIBCPP_ASSERT(s.__invariants());
  25   assert(s == expected);
  26 }
  27
  28 template <class S>
  29 TEST_CONSTEXPR_CXX20 void test_string() {
  30   typedef std::string_view SV;
  31   test(S(), SV(), S());
  32   test(S(), SV("12345"), S("12345"));
  33   test(S(), SV("1234567890"), S("1234567890"));
  34   test(S(), SV("12345678901234567890"), S("12345678901234567890"));
  35
  36   test(S("12345"), SV(), S("12345"));
  37   test(S("12345"), SV("12345"), S("1234512345"));
  38   test(S("12345"), SV("1234567890"), S("123451234567890"));
  39   test(S("12345"), SV("12345678901234567890"), S("1234512345678901234567890"));
  40
  41   test(S("1234567890"), SV(), S("1234567890"));
  42   test(S("1234567890"), SV("12345"), S("123456789012345"));
  43   test(S("1234567890"), SV("1234567890"), S("12345678901234567890"));
  44   test(S("1234567890"), SV("12345678901234567890"), S("123456789012345678901234567890"));
  45
  46   test(S("12345678901234567890"), SV(), S("12345678901234567890"));
  47   test(S("12345678901234567890"), SV("12345"), S("1234567890123456789012345"));
  48   test(S("12345678901234567890"), SV("1234567890"), S("123456789012345678901234567890"));
  49   test(S("12345678901234567890"), SV("12345678901234567890"), S("1234567890123456789012345678901234567890"));
  50 }
  51
  52 TEST_CONSTEXPR_CXX20 bool test() {
  53   test_string<std::string>();
  54 #if TEST_STD_VER >= 11
  55   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
  56 #endif
  57
  58   return true;
  59 }
  60
  61 int main(int, char**) {
  62   test();
  63 #if TEST_STD_VER > 17
  64   static_assert(test());
  65 #endif
  66
  67   return 0;
  68 }