libcxx/test/std/containers/sequences/vector.bool/reserve.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 // <vector>
  10 // vector<bool>
  11
  12 // void reserve(size_type n);
  13
  14 #include <vector>
  15 #include <cassert>
  16 #include <stdexcept>
  17
  18 #include "test_macros.h"
  19 #include "min_allocator.h"
  20 #include "test_allocator.h"
  21
  22 TEST_CONSTEXPR_CXX20 bool tests()
  23 {
  24     {
  25         std::vector<bool> v;
  26         v.reserve(10);
  27         assert(v.capacity() >= 10);
  28     }
  29     {
  30         std::vector<bool> v(100);
  31         assert(v.capacity() >= 100);
  32         v.reserve(50);
  33         assert(v.size() == 100);
  34         assert(v.capacity() >= 100);
  35         v.reserve(150);
  36         assert(v.size() == 100);
  37         assert(v.capacity() >= 150);
  38     }
  39 #if TEST_STD_VER >= 11
  40     {
  41         std::vector<bool, min_allocator<bool>> v;
  42         v.reserve(10);
  43         assert(v.capacity() >= 10);
  44     }
  45     {
  46         std::vector<bool, explicit_allocator<bool>> v;
  47         v.reserve(10);
  48         assert(v.capacity() >= 10);
  49     }
  50     {
  51         std::vector<bool, min_allocator<bool>> v(100);
  52         assert(v.capacity() >= 100);
  53         v.reserve(50);
  54         assert(v.size() == 100);
  55         assert(v.capacity() >= 100);
  56         v.reserve(150);
  57         assert(v.size() == 100);
  58         assert(v.capacity() >= 150);
  59     }
  60 #endif
  61 #ifndef TEST_HAS_NO_EXCEPTIONS
  62     if (!TEST_IS_CONSTANT_EVALUATED) {
  63         std::vector<bool, limited_allocator<bool, 10> > v;
  64         v.reserve(5);
  65         try {
  66             // A typical implementation would allocate chunks of bits.
  67             // In libc++ the chunk has the same size as the machine word. It is
  68             // reasonable to assume that in practice no implementation would use
  69             // 64 kB or larger chunks.
  70             v.reserve(10 * 65536);
  71             assert(false);
  72         } catch (const std::length_error&) {
  73             // no-op
  74         }
  75         assert(v.capacity() >= 5);
  76     }
  77 #endif
  78
  79     return true;
  80 }
  81
  82 int main(int, char**)
  83 {
  84     tests();
  85 #if TEST_STD_VER > 17
  86     static_assert(tests());
  87 #endif
  88     return 0;
  89 }