libcxx/test/std/utilities/memory/util.smartptr/util.smartptr.shared/util.smartptr.shared.mod/reset.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 // <memory>
  10
  11 // shared_ptr
  12
  13 // void reset();
  14
  15 #include <memory>
  16 #include <cassert>
  17
  18 #include "test_macros.h"
  19
  20 struct B
  21 {
  22     static int count;
  23
  24     B() {++count;}
  25     B(const B&) {++count;}
  26     virtual ~B() {--count;}
  27 };
  28
  29 int B::count = 0;
  30
  31 struct A
  32     : public B
  33 {
  34     static int count;
  35
  36     A() {++count;}
  37     A(const A& other) : B(other) {++count;}
  38     ~A() {--count;}
  39 };
  40
  41 int A::count = 0;
  42
  43 int main(int, char**)
  44 {
  45     {
  46         std::shared_ptr<B> p(new B);
  47         p.reset();
  48         assert(A::count == 0);
  49         assert(B::count == 0);
  50         assert(p.use_count() == 0);
  51         assert(p.get() == 0);
  52     }
  53     assert(A::count == 0);
  54     {
  55         std::shared_ptr<B> p;
  56         p.reset();
  57         assert(A::count == 0);
  58         assert(B::count == 0);
  59         assert(p.use_count() == 0);
  60         assert(p.get() == 0);
  61     }
  62     assert(A::count == 0);
  63
  64   return 0;
  65 }