• =?UTF-8?B?0JLQuNGC0LDQu9C40Lkg0KTQsNC0?= =?UTF-8?B?0LXQtdCy?= (25/26) Aug 11 2021 I interest this too.

=?UTF-8?B?0JLQuNGC0LDQu9C40Lkg0KTQsNC0?= =?UTF-8?B?0LXQtdCy?= writes:

https://forum.dlang.org/post/j8nnr2$bgf$1 digitalmars.com

On Tuesday, 1 November 2011 at 03:08:18 UTC, Kapps wrote:
 Thanks for the explanation guys.

I interest this too.
Theme up.

         int opApply( scope int delegate( FT_Outline outline ) dg )
         {
             // ...more code...
             return 0;
         }


         void main()
         {
             // ...initialization code...

             foreach ( outl; outline )
             {
                 writeln( outl );
             }
         }


I tested this code in Compiler Explorer: 
https://godbolt.org/z/vnqoYsazn

With default options LDC do call the `example.FT_Outline.opApply`.

But with `-O` and when function `opApply()` marked as `pragma( 
inline, true )` then LDC put opApply() body inline. I see call 
`writeln()` directly from `_Dmain`, without call/ret | jmp.

LDC can put foreach body inline. But need to test with real-world 
application.