Delegate function access to classes local variable

[Dicebot]

On Friday, 8 November 2013 at 12:43:37 UTC, Colin Grogan wrote:
> import std.stdio;
> void main()
> {
> 	Column!string col1 = new Column!string( {return "test"; }, 
> "Hello, ");
> 	Column!string col2 = new Column!string( {return vars[0]; }, 
> "World"); // Compilation fail!! Delegate cant see vars[0]
> 	writef("%s", col1.nextValue);
> 	writefln("%s", col2.nextValue);
> // I want it to print "Hello, World" here
> }

Delegate refers to context it was created in. Your delegates are 
created in `main()` scope/context and thus can only access its 
stack frame. You can't access caller context from delegates.