Re: get the allocated size of a vector

Dear,

Is there a way to get the allocated size of the val in the code below?

Actual problem is that I have a double pointer in code and its addressed
is passed to a routine which does some allocation for this pointer to
pointer if I am right in the description. I tried to reproduce a very
simple code for this. Is that possible to get the allocated size in bytes
in main or it should be done in the function itself, but in main I should
be able to perform some operations on this vector? This is actually a C
code I am trying to interface in C++.

#include<iostream>

using namespace std;

void alloc(double **ptr)
{
  int i;
  *ptr = new double[10];
  for(i=0;i<10;++i)
    (*ptr)[i]=i*0.36;
}

int main()
{
  double* val;
  alloc(&val);
  // how to get the allocated size or is that
  // possible to retrieve some elements for the
  // above allocation ?
  return 0;
}