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  1. #include <iostream>
  2. class Foo {
  3. public:
  4.     Foo()
  5.     {
  6.         throw std::runtime_error("Oops!");
  7.     }
  8. };
  9. struct Arena {
  10.     bool touched = false;
  11. };
  12. void* operator new(std::size_t, Arena& arena)
  13. {
  14.     std::cout << "new has called.\n";
  15.     return ::operator new(sizeof(Foo));
  16. }
  17. void operator delete(void*, Arena& arena)
  18. {
  19.     std::cout << "delete has called.\n";
  20.     arena.touched = true;
  21. }
  22. int main(int argc, char** argv)
  23. {
  24.     Arena arena;
  25.     try {
  26.         new(arena) Foo;
  27.     }
  28.     catch(...) {
  29.         std::cout << "exception was thrown.\n";
  30.     }
  31.     // This differs for different type of builds.
  32.     std::cout << std::boolalpha << "arena.touched == " << arena.touched << '\n';
  33.     return 0;
  34. }
  35.  
Success #stdin #stdout 0s 4456KB
comments (?)
stdin
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Standard input is empty
stdout
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new has called.
delete has called.
exception was thrown.
arena.touched == true
https://ideone.com/q7DQz9
language:
C++14 (clang 8.0)
created:
8 years ago
visibility:
public

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