automatic function call after closing block

[Sergey Gromov]

As to how it works.  The t.bindBlock() in {...} can be rewritten using 
C++-like syntax:

void worker()
{
    // some rendering code!
}
BindBlock bb = t.bindBlock();
bb.opIn(&worker);

The code below simply writes all this in one line using a temporary 
BindBlock structure, an overloaded operator 'in', and an inline 
anonymous delegate syntax.

Saaa <empty at needmail.com> wrote:
> :D
> Looks cool!
> No way I could have come up with that.
> Same question (as I have no clue how this internally works):
> Is there a performance penalty?
> 
> > How about a horrible/wonderful misuse of the 'in' operator?  (credited
> > to Tom S):
> >
> > class Texture
> > {
> > ...
> >    struct BindBlock
> >    {
> >        Texture self;
> >        void opIn(void delegate() dg)
> >        {
> >            self.bind();
> >            scope(exit) self.unbind();
> >            dg();
> >        }
> >    }
> >
> >    BindBlock bindBlock() { return BindBlock(this); }
> > ...
> > }
> >
> > auto t = new Texture("foo.png");
> >
> > t.bindBlock() in
> > {
> >    // some rendering code!
> > };