Why no variable size array in stack?

Question

I don\'t really understand why I can\'t have a variable size array on the stack, so something like

foo(int n) {
   int a[n];
}

As I underst

Answer 1

Note that the proposal was rejected and the following is no longer true. It may be revived for a future version of C++ though.

VLA as described in N3639 has been accepted in Bristol meeting and will become part of C++14, as well as a library counter-part "dynarray". So using compiler with C++14 support we can start writing something like:

void func(int n)
{
    int arr[n];
}

Or use dynarray:

#include 

void func(int n)
{
    std::dynarray arr(n);
}