mixins

[Tejas]

On Wednesday, 17 November 2021 at 14:51:58 UTC, Abby wrote:
> Hello I would like to create validation mixin or mixin template 
> which would return on error.
>
> Something like this:
>
>
> ```
> mixin template Validate(a, b)
> {
>     if(a > b)
>     {
>        writeln("invalid input");
>        return false;
>     }
> }
>
> bool test(a,b)
> {
>     mixin Validate!(a,b);
>
>     ----
>     on valid code
>     ----
>
>     return true;
> }
> ```

This good enough?
```d
mixin template Validate(T)
{
     import std.stdio:writeln;
     bool Validate(T a, T b){
     	if(a > b)
     	{
        		writeln("invalid input");
        		return false;
     	}
         else{
             writeln("Valid input");
             return true;
         }
     }
}

bool test(int a, int b)
{
     mixin Validate!(int);

     /+----
     on valid code
     ----+/
	if (Validate(a,b))
     	return true;
     else
         return false;
}

void main(){
     test(100,300);
     test(300,100);
}
```