std::free is an STL function used in C-style memory management:

std::malloc: allocates memory
std::realloc: reallocates memory
std::free: releases memory

Prefer to use the C++ keyword new over std::malloc, as std::malloc does not call a constructor. Prefer to use the C++ keyword delete over std::free, as std::free does not call a destructor.


#include <cassert>

#include <cstdlib>



int main()

{

  const int size = 100;



  //Create a dynamically allocated array

  int * my_array = static_cast<int*>(std::malloc(size * sizeof(int)));



  //Assume the memory for the array could be allocated

  assert(my_array);



  const int new_size = 200;



  //Resize the array

  my_array = static_cast<int*>(std::realloc (my_array, new_size * sizeof(int)));



  //Assume the memory for the array could be allocated

  assert(my_array);



  //Free the array

  std::free(my_array);

}

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(C++) std::free