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 // An 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
  21 template <class C>
  22 void test_contiguous ( const C &c )
  23 {
  24     for ( size_t i = 0; i < c.size(); ++i )
  25         assert ( *(c.begin() + static_cast<typename C::difference_type>(i)) == *(std::addressof(*c.begin()) + i));
  26 }
  27
  28 int main(int, char**)
  29 {
  30     {
  31     typedef std::string S;
  32     test_contiguous(S());
  33     test_contiguous(S("1"));
  34     test_contiguous(S("1234567890123456789012345678901234567890123456789012345678901234567890"));
  35     }
  36
  37     {
  38     typedef test_allocator<char> A;
  39     typedef std::basic_string<char, std::char_traits<char>, A> S;
  40     test_contiguous(S(A(3)));
  41     test_contiguous(S("1", A(5)));
  42     test_contiguous(S("1234567890123456789012345678901234567890123456789012345678901234567890", A(7)));
  43     }
  44 #if TEST_STD_VER >= 11
  45     {
  46     typedef min_allocator<char> A;
  47     typedef std::basic_string<char, std::char_traits<char>, A> S;
  48     test_contiguous(S(A{}));
  49     test_contiguous(S("1", A()));
  50     test_contiguous(S("1234567890123456789012345678901234567890123456789012345678901234567890", A()));
  51     }
  52 #endif
  53
  54   return 0;
  55 }