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  1. #include <iostream>
  2. #include <memory>
  3. #include <string>
  4. #include <ostream>
  5.  
  6. using namespace std;
  7.  
  8. class Thing {
  9.   private:
  10. 	string name;
  11.  
  12.   public:
  13.     Thing(): name() {
  14.     	cout << "Creating anonymous thing" << endl;
  15.     }
  16.  
  17.     Thing(string name): name(name) {
  18.     	cout << "Creating thing " << name << endl;
  19.     }
  20.  
  21.     ~Thing() {
  22.     	cout << "Destroying thing " << this->name << endl;
  23.     }
  24.  
  25.     void setName(const string & name) {
  26.     	this->name = name;
  27.     }
  28.  
  29.     string getName() {
  30.     	return this->name;
  31.     }
  32. };
  33.  
  34. void swapThings(shared_ptr<Thing> & a, const shared_ptr<Thing> b) {
  35. 	a->setName("foo");
  36. 	a = b;
  37. }
  38.  
  39. int main() {
  40. 	auto a = make_shared<Thing>(Thing());
  41. 	auto b = make_shared<Thing>(Thing("bar"));
  42.  
  43. 	swapThings(a, b);
  44.  
  45. 	cout << "a::name: " << a->getName() << endl;
  46. 	cout << "b::name: " << b->getName() << endl;
  47.  
  48. 	return 0;
  49. }
Success #stdin #stdout 0s 3276KB
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stdin
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Standard input is empty
stdout
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Creating anonymous thing
Destroying thing 
Creating thing bar
Destroying thing bar
Destroying thing foo
a::name: bar
b::name: bar
Destroying thing bar
https://ideone.com/294F0H
c shared swap test
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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