fork download
copy 
  1. #include <iostream>
  2. #include <type_traits>
  3.  
  4. class A // trivial
  5. {
  6.     int dummy;
  7. public:
  8.  
  9.     void* operator new[](std::size_t size)
  10.     {
  11.         std::cout << "A::new[] size = " << size << '\n';
  12.  
  13.         return ::operator new[](size);
  14.     }
  15. };
  16.  
  17. class B // nicht trivial
  18. {
  19.     int dummy;
  20. public:
  21.  
  22.     ~B() { dummy = 0; }
  23.  
  24.     void* operator new[](std::size_t size)
  25.     {
  26.         std::cout << "B::new[] size = " << size << '\n';
  27.  
  28.         return ::operator new[](size);
  29.     }
  30. };
  31.  
  32. int main()
  33. {
  34. 	using namespace std;
  35.  
  36.     A* a = new A[10];
  37.     B* b = new B[10];
  38.  
  39. 	cout << "is_trivially_destructible<A>::value = " << is_trivially_destructible<A>::value << '\n';
  40. 	cout << "is_trivially_destructible<B>::value = " << is_trivially_destructible<B>::value << '\n';
  41.  
  42.     delete[] b;
  43.     delete[] a;
  44.  
  45. 	return 0;
  46. }
Success #stdin #stdout 0s 3472KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
A::new[] size = 40
B::new[] size = 44
is_trivially_destructible<A>::value = 1
is_trivially_destructible<B>::value = 0
https://ideone.com/MNpLf4
language:
C++14 (gcc 8.3)
created:
9 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!