C++内存分配

// operator new[] example
#include <iostream>     // std::cout
#include <new>          // ::operator new[]
 
struct MyClass {
  int data;
  MyClass() {std::cout << '*';}  // print an asterisk for each construction
};
 
int main () {
  std::cout << "constructions (1): ";
  // allocates and constructs five objects:
  MyClass * p1 = new MyClass[5];
  std::cout << '\n';
 
  std::cout << "constructions (2): ";
  // allocates and constructs five objects (nothrow):
  MyClass * p2 = new (std::nothrow) MyClass[5];
  std::cout << '\n';
 
  delete[] p2;
  delete[] p1;
 
  return 0;
}