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  1. #include <iostream>
  2. using namespace std;
  3.  
  4.  
  5.     template<class T0> struct value_wrapper {
  6.  
  7.         value_wrapper( T0* data_ ) {
  8.         	std::cout << "value_wrapper( T0* data_ )" << std::endl;
  9.         	data = data_; 
  10.         }
  11.  
  12.         value_wrapper() {
  13.         	std::cout << "value_wrapper()" << std::endl;
  14.         	data = new T0{}; 
  15.         }
  16.  
  17.         value_wrapper( const value_wrapper& other ) {
  18.         	std::cout << "value_wrapper( const value_wrapper& other )" << std::endl;
  19.         	data = new T0{}; 
  20.         	*data = *other.data;
  21.         }
  22.  
  23.         value_wrapper& operator=( const value_wrapper& other ) {
  24.         	std::cout << "value_wrapper& operator=( const value_wrapper& other )" << std::endl;
  25.             *data = *other.data;
  26.         }
  27.  
  28.         ~value_wrapper() {
  29.         	std::cout << "~value_wrapper()" << std::endl;
  30.             delete data;
  31.         }
  32.  
  33.         //move construction and assigment, other operators and member functions
  34.  
  35.         T0* data;
  36.     };
  37.  
  38. //test class
  39. struct value {
  40.         value() { std::cout << "value()" << std::endl; }
  41. 	    value( const value& other ) { std::cout << "value( const value& other )" << std::endl; }
  42.         value& operator=( const value& other ) { std::cout << "value& operator=( const value& other )" << std::endl; }
  43.         ~value() { std::cout << "~value()" << std::endl; }
  44. };
  45.  
  46.  
  47. int main() {
  48. 	value_wrapper<value> v1{ new value{} };
  49. 	value_wrapper<value> v2{};
  50. 	v2 = v1;
  51. }
  52.  
  53.  
Success #stdin #stdout 0s 3460KB
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Standard input is empty
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value()
value_wrapper( T0* data_ )
value_wrapper()
value()
value_wrapper& operator=( const value_wrapper& other )
value& operator=( const value& other )
~value_wrapper()
~value()
~value_wrapper()
~value()
https://ideone.com/FBaLtw
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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