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#include <new>
 
void custom_new_handler() {
  // Returns number of bytes freed.
  extern std::size_t reclaim_resources();
  reclaim_resources();
}
 
int main() {
  std::set_new_handler(custom_new_handler);
 
  // ...
}

#include <new>

void custom_new_handler() noexcept(false) {
  // Returns number of bytes freed.
  extern std::size_t reclaim_resources();
  if (0 == reclaim_resources()) {
    throw std::bad_alloc();
  }
}
 
int main() {
  std::set_new_handler(custom_new_handler);
 
  // ...
}