fork download 
  1.     #include <iostream>
  2.     #include <new>
  3.     using namespace std;
  4.  
  5.     class Data {
  6.     public:
  7.             Data(int first) {
  8.                     data[0] = first;
  9.                     cout<<"Constructor 1 " <<first;
  10.             }
  11.  
  12.             Data(int first, int second) {
  13.                     data[0] = first;
  14.                     data[1] = second;
  15.                     cout<<"Constructor 2 " <<first<< ";"<<second;
  16.             }
  17.  
  18.             void* operator new(size_t x);
  19.  
  20.             void* operator new(size_t x, const std::nothrow_t& nothrow_value) throw();
  21.  
  22.             void operator delete(void* ptr);
  23.  
  24.     private:
  25.             int data[10];
  26.     };
  27.  
  28.     //class DataTag;
  29.     class DumbClass{};
  30.  
  31.     //typedef boost::singleton_pool<DataTag, sizeof(Data)> DataPool;
  32.  
  33.     void* Data::operator new(size_t x) {
  34.     	cout<<"new 1 operator called";
  35.     	void* mem = malloc(x);
  36.     	return mem;
  37.             /*void* ptr = DataPool::malloc();
  38.             if (ptr) {
  39.                     return ptr;
  40.             } else {
  41.                     throw std::bad_alloc();
  42.             }*/
  43.     }
  44.  
  45.     void* Data::operator new(size_t x, const std::nothrow_t& nothrow_value) throw() {
  46.     	    	cout<<"new 2 operator called";
  47.     	    	return new DumbClass();
  48.             //return DataPool::malloc();
  49.     }
  50.  
  51.     void Data::operator delete(void* ptr) {
  52.             //DataPool::free(ptr);
  53.             free(ptr);
  54.     }
  55.  
  56.     int main() {
  57.     		Data* data = new Data(1, 2);
  58.     		return 0;
  59.             //Data* data = new Data(1);
  60.             delete data;
  61.             data = new (std::nothrow) Data(1, 2);
  62.             delete data;
  63.     }
  64.  
  65.  
Success #stdin #stdout 0s 3428KB
comments (?)
stdin 
Standard input is empty
stdout 
new 1 operator calledConstructor 2 1;2
https://ideone.com/DfJS4N
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!