libcxx/test/std/strings/basic.string/string.require/contiguous.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 // <array>
  10
  11 // A string is a contiguous container
  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 C>
  21 TEST_CONSTEXPR_CXX20 void test_contiguous(const C& c) {
  22   for (std::size_t i = 0; i < c.size(); ++i)
  23     assert(*(c.begin() + static_cast<typename C::difference_type>(i)) == *(std::addressof(*c.begin()) + i));
  24 }
  25
  26 template <class Alloc>
  27 TEST_CONSTEXPR_CXX20 void test_string(const Alloc& a) {
  28   typedef std::basic_string<char, std::char_traits<char>, Alloc> S;
  29
  30   {
  31     test_contiguous(S());
  32     test_contiguous(S("1"));
  33     test_contiguous(S("1234567890123456789012345678901234567890123456789012345678901234567890"));
  34   }
  35   {
  36     test_contiguous(S(Alloc()));
  37     test_contiguous(S("1", Alloc()));
  38     test_contiguous(S("1234567890123456789012345678901234567890123456789012345678901234567890", Alloc()));
  39   }
  40   {
  41     test_contiguous(S(Alloc(a)));
  42     test_contiguous(S("1", Alloc(a)));
  43     test_contiguous(S("1234567890123456789012345678901234567890123456789012345678901234567890", Alloc(a)));
  44   }
  45 }
  46
  47 TEST_CONSTEXPR_CXX20 bool test() {
  48   test_string(std::allocator<char>());
  49   test_string(test_allocator<char>());
  50   test_string(test_allocator<char>(3));
  51 #if TEST_STD_VER >= 11
  52   test_string(min_allocator<char>());
  53 #endif
  54
  55   return true;
  56 }
  57
  58 int main(int, char**) {
  59   test();
  60 #if TEST_STD_VER > 17
  61   static_assert(test());
  62 #endif
  63
  64   return 0;
  65 }