realloc

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#ifndef tools_realloc
#define tools_realloc
 
#include <cstring> //memcpy
 
namespace tools {
 
template <class T>
inline bool realloc(T*& a_pointer,size_t a_new_size,size_t 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){
      size_t num = a_new_size-a_old_size;
      T* pos = pointer+a_old_size;
      for(size_t 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