libcxx/test/std/strings/basic.string/string.ops/string.accessors/get_allocator.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 // allocator_type get_allocator() const; // constexpr since C++20
  12
  13 #include <string>
  14 #include <cassert>
  15
  16 #include "test_macros.h"
  17 #include "test_allocator.h"
  18 #include "min_allocator.h"
  19
  20 template <class S>
  21 TEST_CONSTEXPR_CXX20 void test(const S& s, const typename S::allocator_type& a) {
  22   assert(s.get_allocator() == a);
  23 }
  24
  25 template <class Alloc>
  26 TEST_CONSTEXPR_CXX20 void test_string(const Alloc& a) {
  27   using S = std::basic_string<char, std::char_traits<char>, Alloc>;
  28   test(S(""), Alloc());
  29   test(S("abcde", Alloc(a)), Alloc(a));
  30   test(S("abcdefghij", Alloc(a)), Alloc(a));
  31   test(S("abcdefghijklmnopqrst", Alloc(a)), Alloc(a));
  32 }
  33
  34 TEST_CONSTEXPR_CXX20 bool test() {
  35   test_string(std::allocator<char>());
  36   test_string(test_allocator<char>());
  37   test_string(test_allocator<char>(1));
  38   test_string(test_allocator<char>(2));
  39   test_string(test_allocator<char>(3));
  40 #if TEST_STD_VER >= 11
  41   test_string(min_allocator<char>());
  42 #endif
  43
  44   return true;
  45 }
  46
  47 int main(int, char**) {
  48   test();
  49 #if TEST_STD_VER > 17
  50   static_assert(test());
  51 #endif
  52
  53   return 0;
  54 }