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  1. #include <cstdlib>
  2. #include <cstdio>
  3. #include <exception>
  4.  
  5.  
  6. void* operator new(std::size_t n)
  7. {
  8.   std::puts("usual new");
  9.   void* p = std::malloc(n);
  10.   return p ? p : throw std::exception();
  11. }
  12. void operator delete(void* p)
  13. {
  14.   std::puts("usual delete");
  15.   std::free(p);
  16. }
  17.  
  18. void* operator new(std::size_t n, std::size_t)
  19. {
  20.   std::puts("placement new");
  21.   void* p = std::malloc(n);
  22.   return p ? p : throw std::exception();
  23. }
  24. void operator delete(void* p, std::size_t)
  25. {
  26.   std::puts("placement delete");
  27.   std::free(p);
  28. }
  29.  
  30. struct throwable_t {} throwable;
  31. struct sth
  32. {
  33.   sth() = default;
  34.   sth(const throwable_t&) { throw std::exception(); }
  35. };
  36.  
  37. int main()
  38. {
  39.   std::puts("usual new/delete");
  40.   sth* p = new sth();
  41.   delete p;
  42.  
  43.   try { p = new sth(throwable); }
  44.   catch (...) {}
  45.  
  46.   std::puts("placement new/delete");
  47.   p = new (123) sth();
  48.   p->~sth();
  49.   operator delete(p, 123);
  50.  
  51.   try { p = new(123) sth(throwable); }
  52.   catch (...) {}
  53. }
Success #stdin #stdout 0s 3460KB
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stdin
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Standard input is empty
stdout
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usual new/delete
usual new
usual delete
usual new
usual delete
placement new/delete
placement new
placement delete
placement new
placement delete
https://ideone.com/F7QBbv
language:
C++ (gcc 8.3)
created:
7 years ago
visibility:
public

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