test/std/utilities/memory/specialized.algorithms/specialized.destroy/destroy.pass.cpp

   1 //===----------------------------------------------------------------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is dual licensed under the MIT and the University of Illinois Open
   6 // Source Licenses. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 // UNSUPPORTED: c++98, c++03, c++11, c++14
  11
  12 // <memory>
  13
  14 // template <class ForwardIt>
  15 // void destroy(ForwardIt, ForwardIt);
  16
  17 #include <memory>
  18 #include <cstdlib>
  19 #include <cassert>
  20
  21 #include "test_macros.h"
  22 #include "test_iterators.h"
  23
  24 struct Counted {
  25   static int count;
  26   static void reset() { count = 0; }
  27   Counted() { ++count; }
  28   Counted(Counted const&) { ++count; }
  29   ~Counted() { --count; }
  30   friend void operator&(Counted) = delete;
  31 };
  32 int Counted::count = 0;
  33
  34 int main()
  35 {
  36     using It = forward_iterator<Counted*>;
  37     const int N = 5;
  38     alignas(Counted) char pool[sizeof(Counted)*N] = {};
  39     Counted* p = (Counted*)pool;
  40     std::uninitialized_fill(p, p+N, Counted());
  41     assert(Counted::count == 5);
  42     std::destroy(p, p+1);
  43     p += 1;
  44     assert(Counted::count == 4);
  45     std::destroy(It(p), It(p + 4));
  46     assert(Counted::count == 0);
  47 }