libcxx/test/std/strings/basic.string/string.cons/pointer_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>&
  12 //   operator=(const charT* s); // constexpr since C++20
  13
  14 #include <string>
  15 #include <cassert>
  16
  17 #include "test_macros.h"
  18 #include "min_allocator.h"
  19
  20 template <class S>
  21 TEST_CONSTEXPR_CXX20 void test(S s1, const typename S::value_type* s2) {
  22   typedef typename S::traits_type T;
  23   s1 = s2;
  24   LIBCPP_ASSERT(s1.__invariants());
  25   assert(s1.size() == T::length(s2));
  26   assert(T::compare(s1.data(), s2, s1.size()) == 0);
  27   assert(s1.capacity() >= s1.size());
  28 }
  29
  30 template <class S>
  31 TEST_CONSTEXPR_CXX20 void test_string() {
  32   test(S(), "");
  33   test(S("1"), "");
  34   test(S(), "1");
  35   test(S("1"), "2");
  36   test(S("1"), "2");
  37
  38   test(S(), "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz");
  39   test(S("123456789"), "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz");
  40   test(S("1234567890123456789012345678901234567890123456789012345678901234567890"),
  41        "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz");
  42   test(S("1234567890123456789012345678901234567890123456789012345678901234567890"
  43          "1234567890123456789012345678901234567890123456789012345678901234567890"),
  44        "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz");
  45 }
  46
  47 TEST_CONSTEXPR_CXX20 bool test() {
  48   test_string<std::string>();
  49 #if TEST_STD_VER >= 11
  50   test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
  51 #endif
  52
  53   return true;
  54 }
  55
  56 int main(int, char**) {
  57   test();
  58 #if TEST_STD_VER > 17
  59   static_assert(test());
  60 #endif
  61
  62   return 0;
  63 }