Re: param2 = param1

[Yota]

On Tuesday, 27 August 2013 at 21:51:48 UTC, Andrej Mitrovic wrote:
On 8/27/13, <l...@luismarques.eu>"@puremagic.com 
<"\"Luís".Marques"> wrote:
     // Not OK
     int foo(int x, int y = x)
     {
         return x*y;
     }

Personally I think a much more useful feature would be (and this
doesn't block this feature but it's related to default 
arguments):

struct S
{
    void foo(int x = this.y)
    {
    }

    int y;
}

I used to do something similar to that in another language.  
Something like...

void toggle(bool newState = !this.state) { this.state = newState; 
}

A function that could set state to a given value, or toggle it if 
omitted.  Then again, that language didn't have overloading at 
all.

Another example, but with more complex processing.
void speak(string msg, bool bypassMute = 
this.channel.isAdmin(this.username)) { ... }