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  1. #include <algorithm>
  2. #include <iostream>
  3. #include <new>
  4.  
  5. using namespace std;
  6.  
  7. struct A
  8. {
  9.     static void * operator new [] (size_t t, int first, int second);
  10.     static void operator delete [] (void *p, size_t t);
  11.     static void operator delete [] (void *p, int first, int second)
  12.     {
  13.         cout << "3 parameters deallocation: " << first << ", " << second << endl;
  14.         return ::operator delete[](p);
  15.     }
  16. };
  17.  
  18. // simple POD struct to store the placement parameters
  19. struct info {
  20. 	int first_param, second_param;
  21. };
  22.  
  23. void* A::operator new [] (size_t t, int first, int second)
  24. {
  25. 	cout << "3 parameters allocation: " << first << ", " << second << endl;
  26. 	// allocate sizeof(info) extra space to store the parameters
  27.     auto const p = ::operator new[](t + sizeof(info));
  28.     auto const pinfo = reinterpret_cast<char*>(p) + t;
  29.     auto const tmp = info{first, second};
  30.     std::copy_n(reinterpret_cast<const char*>(&tmp), sizeof(info), pinfo);
  31.     return p;
  32. }
  33.  
  34. static void A::operator delete [] (void *p, std::size_t t) {
  35. 	// retrieve the parameters that we stored in operator new [].
  36.     auto const pinfo = reinterpret_cast<const char*>(p) + t;
  37.     auto tmp = info{};
  38.     std::copy_n(pinfo, sizeof(info), reinterpret_cast<char*>(&tmp));
  39.     cout << "Deleting with original parameters: " << tmp.first_param << ", " << tmp.second_param << endl;
  40.     ::operator delete[](p);
  41. }
  42.  
  43. int main()
  44. {
  45.     A *a = new (5,5) A[10]; //operator new [] (size_t, int, int) invoked
  46.     A *b = new (3,7) A[2]; //operator new [] (size_t, int, int) invoked
  47.     delete [] a;
  48.     delete [] b;
  49. }
  50.  
Success #stdin #stdout 0s 3472KB
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stdin
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Standard input is empty
stdout
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3 parameters allocation: 5, 5
3 parameters allocation: 3, 7
Deleting with original parameters: 5, 5
Deleting with original parameters: 3, 7
https://ideone.com/s6JP2o
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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