Example set_new_handler

ExampleNewHanlder

#include <iostream>

class ReservedMemory {
 public:
  ReservedMemory()
      : theMemoryReserved(new char[80000*1024])
  {}
  ~ReservedMemory() { delete []theMemoryReserved; }
  void release() {
    if (theMemoryReserved) {
      std::cout << "FREEING SOME MEMORY" << std::endl;
      delete []theMemoryReserved;
      theMemoryReserved = nullptr;
    } else {
      std::cout << "NO MORE MEMORY TO FREE" << std::endl;
      throw std::bad_alloc();
    }
  }
 private:
  const char* theMemoryReserved;
};

ReservedMemory rm;

int main(int argc, char** argv) {
  std::set_new_handler([](){ rm.release(); });

  char * ptr = new char[50000*1024];

  std::cout << "SUCCEEDED" << std::endl;

  char * ptra = new char[50000*1024];
}