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  1. #include <iostream>
  2. #include <algorithm>
  3. #include <utility>
  4.  
  5. typedef long LONG;
  6. typedef int BOOL;
  7.  
  8. struct STOP_FLAG
  9. {
  10.     STOP_FLAG()
  11.         : shared(new Shared())
  12.     {
  13.     }
  14.  
  15.     ~STOP_FLAG()
  16.     {
  17.         shared->release();
  18.     }
  19.  
  20.     STOP_FLAG(const STOP_FLAG& s)
  21.         : shared((s.shared->grab(), s.shared))
  22.     {
  23.     }
  24.  
  25.     // assignment operator by copy/swap idiom
  26.     STOP_FLAG& operator = (STOP_FLAG s)
  27.     {
  28.         std::swap(shared, s.shared);
  29.         return *this;
  30.     }
  31.  
  32. private:
  33.     struct Shared
  34.     {
  35.         BOOL value;
  36.         LONG refCount;
  37.  
  38.         Shared() : value(), refCount()
  39.         {
  40.             grab();
  41.         }
  42.  
  43.         void grab()
  44.         {
  45.             std::cout << '\t' << __PRETTY_FUNCTION__ << ':' << refCount+1 << '\n';
  46.             ++refCount;
  47.         }
  48.  
  49.         void release()
  50.         {
  51.             std::cout << '\t' << __PRETTY_FUNCTION__ << ':' << refCount-1 << '\n';
  52.             if (!--refCount)
  53.                 delete this;
  54.         }
  55.  
  56.     } *shared;
  57. };
  58.  
  59. int main()
  60. {
  61.     std::cout << "STOP_FLAG sf;" << '\n';
  62.     STOP_FLAG sf;
  63.     {
  64.         std::cout << "STOP_FLAG s2(sf);" << '\n';
  65.         STOP_FLAG s2(sf);
  66.  
  67.         std::cout << "s2 = sf;" << '\n';
  68.         s2 = sf;
  69.  
  70.         std::cout << "STOP_FLAG s3;" << '\n';
  71.         STOP_FLAG s3;
  72.  
  73.         std::cout << "s3 = s2;" << '\n';
  74.         s3 = s2;
  75.  
  76.         std::cout << "STOP_FLAG s4[3];" << '\n';
  77.         STOP_FLAG s4[3];
  78.  
  79.         std::cout << "s4[0] = s3;" << '\n';
  80.         s4[0] = s3;
  81.         std::cout << "s4[1] = s3;" << '\n';
  82.         s4[1] = s3;
  83.         std::cout << "s4[2] = s3;" << '\n';
  84.         s4[2] = s3;
  85.  
  86.         std::cout << "STOP_FLAG s5;" << '\n';
  87.         STOP_FLAG s5;
  88.  
  89.         std::cout << "s3 = s5;" << '\n';
  90.         s3 = s5;
  91.  
  92.         std::cout << "scope exiting\n";
  93.     }
  94.     std::cout << "scope exited\n";
  95. }
Success #stdin #stdout 0s 3476KB
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Standard input is empty
stdout
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STOP_FLAG sf;
	void STOP_FLAG::Shared::grab():1
STOP_FLAG s2(sf);
	void STOP_FLAG::Shared::grab():2
s2 = sf;
	void STOP_FLAG::Shared::grab():3
	void STOP_FLAG::Shared::release():2
STOP_FLAG s3;
	void STOP_FLAG::Shared::grab():1
s3 = s2;
	void STOP_FLAG::Shared::grab():3
	void STOP_FLAG::Shared::release():0
STOP_FLAG s4[3];
	void STOP_FLAG::Shared::grab():1
	void STOP_FLAG::Shared::grab():1
	void STOP_FLAG::Shared::grab():1
s4[0] = s3;
	void STOP_FLAG::Shared::grab():4
	void STOP_FLAG::Shared::release():0
s4[1] = s3;
	void STOP_FLAG::Shared::grab():5
	void STOP_FLAG::Shared::release():0
s4[2] = s3;
	void STOP_FLAG::Shared::grab():6
	void STOP_FLAG::Shared::release():0
STOP_FLAG s5;
	void STOP_FLAG::Shared::grab():1
s3 = s5;
	void STOP_FLAG::Shared::grab():2
	void STOP_FLAG::Shared::release():5
scope exiting
	void STOP_FLAG::Shared::release():1
	void STOP_FLAG::Shared::release():4
	void STOP_FLAG::Shared::release():3
	void STOP_FLAG::Shared::release():2
	void STOP_FLAG::Shared::release():0
	void STOP_FLAG::Shared::release():1
scope exited
	void STOP_FLAG::Shared::release():0
https://ideone.com/yItEmn
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
secret

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