Re: run-time stack-based allocation

[Arne]

On Monday, 7 May 2012 at 16:03:15 UTC, Mehrdad wrote:
On Monday, 7 May 2012 at 13:36:02 UTC, Gor Gyolchanyan wrote:
Basically I want what alloca does, but instead of considering 
the constructor's scope, I want it to hand to the constructor 
call's enclosing scope.

I think you'd need to modify the compiler for this, since 
alloca is 'magical'.

wouldn't mixin's be a solution, one can inject an alloca to the 
current scope, and then call the constructor...

import std.stdio;
import std.c.stdlib;
import std.random;

mixin template Init(alias var, alias size)
{
  void* buf = alloca(size);

  bool foo_init()
  {
    var = (cast(typeof(var))buf);

    var[0]=0;
    var[1]=1;
    var[2]=2;

    return true;
  }

  auto foo_dummy_statement = foo_init();
}

void main()
{
  int my_size = uniform(12, 24);
  int* my_var = void; mixin Init!(my_var, my_size);

  writeln(my_var[0..3]);
}