libcxx/test/std/strings/basic.string/string.cons/char_assignment.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>& operator=(charT c); // constexpr since C++20
  12
  13 #include <string>
  14 #include <cassert>
  15
  16 #include "test_macros.h"
  17 #include "min_allocator.h"
  18
  19 template <class S>
  20 TEST_CONSTEXPR_CXX20 void test(S s1, typename S::value_type s2) {
  21   typedef typename S::traits_type T;
  22   s1 = s2;
  23   LIBCPP_ASSERT(s1.__invariants());
  24   assert(s1.size() == 1);
  25   assert(T::eq(s1[0], s2));
  26   assert(s1.capacity() >= s1.size());
  27 }
  28
  29 template <class S>
  30 TEST_CONSTEXPR_CXX20 void test_string() {
  31   test(S(), 'a');
  32   test(S("1"), 'a');
  33   test(S("123456789"), 'a');
  34   test(S("1234567890123456789012345678901234567890123456789012345678901234567890"), 'a');
  35 }
  36
  37 TEST_CONSTEXPR_CXX20 bool test() {
  38   test_string<std::string>();
  39 #if TEST_STD_VER >= 11
  40   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
  41 #endif
  42
  43   return true;
  44 }
  45
  46 int main(int, char**) {
  47   test();
  48 #if TEST_STD_VER > 17
  49   static_assert(test());
  50 #endif
  51
  52   return 0;
  53 }