#ifndef tools_realloc
#define tools_realloc

#include <cstring> //memcpy

namespace tools {

template <class T>
inline bool realloc(T*& a_pointer,
                    unsigned int a_new_size,unsigned int a_old_size,
                    bool a_init = false) {
  if(!a_new_size) { 
    delete [] a_pointer; 
    a_pointer = 0;
    return true;
  }
  if(!a_pointer) {
    a_pointer = new T[a_new_size];
    if(!a_pointer) return false;
    return true;
  }
  if(a_old_size==a_new_size) return true;
  T* pointer = new T[a_new_size];
  if(!pointer) {
    delete [] a_pointer; 
    a_pointer = 0;
    return false;
  }
  if(a_new_size>a_old_size) {
    ::memcpy(pointer,a_pointer,a_old_size*sizeof(T));
    if(a_init){
      unsigned int num = a_new_size-a_old_size;   
      T* pos = pointer+a_old_size;
      for(unsigned int i=0;i<num;i++,pos++) *pos = T();
    }
  } else {
    ::memcpy(pointer,a_pointer,a_new_size*sizeof(T));
  }
  delete [] a_pointer;
  a_pointer = pointer;
  return true;
}

}

#endif