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digitalmars.D - Code block as template argument

reply =?UTF-8?B?0JLQuNGC0LDQu9C40Lkg0KTQsNC0?= =?UTF-8?B?0LXQtdCy?= writes:
I want template this code

     if ( state & INIT && diraction = IN )
     {
       Label
         text = "text"
     }

     if ( state & OPEN && diraction = OUT )
     {
       delete AppsWindow
       state &= !OPEN
     }

to

     TPL( INIT, IN,
       {
         Label
           text = "text"
       }
     )


     TPL( OPEN, OUT,
       {
         delete AppsWindow
         state &= !OPEN
       }
     )


Desctiption:
condition: "if ( state & OPEN && diraction = OUT )"
replace to template: "TPL( M, D )"
pass code block as argument.

Analog C-code with macros:
     #define TPL(M,D,CODE) if ( state & OPEN && diraction = OUT ) 
CODE;
example code
     TPL( OPEN, OUT,
       {
         delete AppsWindow
         state &= !OPEN
       }
     )

It possible in D ?
How pass code block to template ?
How to solve this problem ?
Feb 11 2020
parent reply =?UTF-8?B?0JLQuNGC0LDQu9C40Lkg0KTQsNC0?= =?UTF-8?B?0LXQtdCy?= writes:
On Tuesday, 11 February 2020 at 11:10:44 UTC, Виталий Фадеев 
wrote:

 I want template this code

     if ( state & INIT && diraction = IN )
     {
       Label
         text = "text"
     }

     if ( state & OPEN && diraction = OUT )
     {
       delete AppsWindow
       state &= !OPEN
     }

 to

     TPL( INIT, IN,
       {
         Label
           text = "text"
       }
     )


     TPL( OPEN, OUT,
       {
         delete AppsWindow
         state &= !OPEN
       }
     )


 Desctiption:
 condition: "if ( state & OPEN && diraction = OUT )"
 replace to template: "TPL( M, D )"
 pass code block as argument.

 Analog C-code with macros:
     #define TPL(M,D,CODE) if ( state & OPEN && diraction = OUT 
 ) CODE;
 example code
     TPL( OPEN, OUT,
       {
         delete AppsWindow
         state &= !OPEN
       }
     )

 It possible in D ?
 How pass code block to template ?
 How to solve this problem ?


Version 2 of question. more accurate.

I want template this code

     if ( state & INIT && diraction = IN )
     {
       Label
         text = "text"
     }

     if ( state & OPEN && diraction = OUT )
     {
       delete AppsWindow
       state &= !OPEN
     }

to

     TPL( INIT, IN,
       {
         Label
           text = "text"
       }
     )


     TPL( OPEN, OUT,
       {
         delete AppsWindow
         state &= !OPEN
       }
     )


Desctiption:
condition: "if ( state & OPEN && diraction = OUT )"
replace to template: "TPL( M, D, CODE )"
pass code block as argument.

Analog C-code with macros:
     #define TPL(M,D,CODE) if ( state & M && diraction = D ) CODE;
example code
     TPL( OPEN, OUT,
       {
         delete AppsWindow
         state &= !OPEN
       }
     )

It possible in D ?
How pass code block to template ?
How to solve this problem ?
Feb 11 2020
parent reply =?UTF-8?Q?Ali_=c3=87ehreli?= <acehreli yahoo.com> writes:
On 2/11/20 3:14 AM, =D0=92=D0=B8=D1=82=D0=B0=D0=BB=D0=B8=D0=B9 =D0=A4=D0=B0=
=D0=B4=D0=B5=D0=B5=D0=B2 wrote:> On Tuesday, 11 February 2020=20
at 11:10:44 UTC, =D0=92=D0=B8=D1=82=D0=B0=D0=BB=D0=B8=D0=B9 =D0=A4=D0=B0=D0=
=B4=D0=B5=D0=B5=D0=B2 wrote:


 Analog C-code with macros:
      #define TPL(M,D,CODE) if ( state & M && diraction =3D D ) CODE;
 example code
      TPL( OPEN, OUT,
        {
          delete AppsWindow
          state &=3D !OPEN
        }
      )

 It possible in D ?


As a friendly reminder, the Learn newsgroup (or its Forum interface at=20
https://forum.dlang.org/group/learn) is more appropriate for such questio=
ns.

Two options come to mind:

uint state;
enum uint OPEN =3D 0x2;
enum Direction { D, OUT }
Direction direction;

// Option 1: Equivalent of a C macro
void executeMaybe(Func)(uint M, Direction D, Func func) {
   if ((state & M) && (direction =3D=3D D)) {
     func();
   }
}

// Option 2: Equivalent of a C struct
struct MaybeExecutor {
   uint M;
   Direction D;

   this (uint M, Direction D) {
     this.M =3D M;
     this.D =3D D;
   }

   auto opCall(Func)(Func func) {
     if ((state & M) && (direction =3D=3D D)) {
       func();
     }
   }
}

void main() {
   int* AppsWindow;

   executeMaybe(OPEN, Direction.OUT, {
       destroy(*AppsWindow);
       state &=3D !OPEN;
     });

   auto ex =3D MaybeExecutor(OPEN, Direction.OUT);
   ex({
       destroy(*AppsWindow);
       state &=3D !OPEN;
     });
}

Ali
Feb 11 2020
next sibling parent reply =?UTF-8?B?0JLQuNGC0LDQu9C40Lkg0KTQsNC0?= =?UTF-8?B?0LXQtdCy?= writes:
On Tuesday, 11 February 2020 at 11:34:49 UTC, Ali Çehreli wrote:

 On 2/11/20 3:14 AM, Виталий Фадеев wrote:> On Tuesday, 11 
 February 2020 at 11:10:44 UTC, Виталий Фадеев wrote:


      [...]


 CODE;

 [...]


 [...]



Thank!
We love small beauty code. Smaller is better. Readable is better.
Like this:

      TPL( OPEN, OUT,
        {
          delete AppsWindow
          state &= !OPEN
        }
      )
Feb 11 2020
parent drug <drug2004 bk.ru> writes:
On 2/11/20 2:39 PM, Виталий Фадеев wrote:

 We love small beauty code. Smaller is better. Readable is better.


How the following:
```D
TPL(OPEN, Direction.OUT,
       {
         AppsWindow);
	state &= !OPEN;
       }
     );
```C
is larger and less readable than
```
TPL( OPEN, OUT,
       {
         delete AppsWindow
         state &= !OPEN
       }
     )
```

Yes, this
```
void TPL(Func)(uint M, Direction D, Func func) {
   if ((state & M) && (direction == D)) {
     func();
   }
}
```
takes a little bit more line than
```
#define TPL(M,D,CODE) if ( state & M && diraction = D ) CODE;
```

But this gives you much more abilities - for example in D this code is 
processed by the compiler and the compiler gives you much more 
informative errors, for example. Хотя, конечно, на вкус и
цвет, товарища 
нет.
Feb 11 2020
prev sibling parent reply Andrea Fontana <nospam example.com> writes:
On Tuesday, 11 February 2020 at 11:34:49 UTC, Ali Çehreli wrote:

 On 2/11/20 3:14 AM, Виталий Фадеев wrote:> On Tuesday, 11 
 February 2020 at 11:10:44 UTC, Виталий Фадеев wrote:


 Analog C-code with macros:
      #define TPL(M,D,CODE) if ( state & M && diraction = D )


                                                ^^^^^^^^^^^^^
 [...]

 // Option 1: Equivalent of a C macro
 void executeMaybe(Func)(uint M, Direction D, Func func) {
   if ((state & M) && (direction == D)) {
     func();
   }
 }

 [...]

 Ali


The C code apparently does an assignment inside the macro.
Feb 11 2020
next sibling parent reply =?UTF-8?Q?Ali_=c3=87ehreli?= <acehreli yahoo.com> writes:
On 2/11/20 6:58 AM, Andrea Fontana wrote:


 Analog C-code with macros:
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 #define TPL(M,D,CODE) if ( state & M &=






& diraction =3D D )

 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=




=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ^^^^^^^^^^^^^


 The C code apparently does an assignment inside the macro.
=20


I still think it's a typo. :)

Ali
Feb 11 2020
parent reply =?UTF-8?B?0JLQuNGC0LDQu9C40Lkg0KTQsNC0?= =?UTF-8?B?0LXQtdCy?= writes:
On Tuesday, 11 February 2020 at 15:08:11 UTC, Ali Çehreli wrote:

 On 2/11/20 6:58 AM, Andrea Fontana wrote:


 Analog C-code with macros:
      #define TPL(M,D,CODE) if ( state & M && diraction = D )


                                     
          ^^^^^^^^^^^^^





 The C code apparently does an assignment inside the macro.
 


 I still think it's a typo. :)

 Ali


Thank. You understand me rigth, but your presented code too big.
We love simple, beauty.
Feb 11 2020
parent reply =?UTF-8?Q?Ali_=c3=87ehreli?= <acehreli yahoo.com> writes:
On 2/11/20 7:32 AM, =D0=92=D0=B8=D1=82=D0=B0=D0=BB=D0=B8=D0=B9 =D0=A4=D0=B0=
=D0=B4=D0=B5=D0=B5=D0=B2 wrote:> On Tuesday, 11 February 2020=20
at 15:08:11 UTC, Ali =C3=87ehreli wrote:

 On 2/11/20 6:58 AM, Andrea Fontana wrote:


 Analog C-code with macros:
      #define TPL(M,D,CODE) if ( state & M && diraction =3D D )


                                                ^^^^^^^^^^^^^





 The C code apparently does an assignment inside the macro.


 I still think it's a typo. :)

 Ali


 Thank. You understand me rigth, but your presented code too big.
 We love simple, beauty.


I love simple and beautiful more than you do. :) The D code I've shown=20
is virtually identical to the C macro if you rename my 'executeMaybe' to =

your 'TPL'.

Ali
Feb 11 2020
parent =?UTF-8?B?0JLQuNGC0LDQu9C40Lkg0KTQsNC0?= =?UTF-8?B?0LXQtdCy?= writes:
On Tuesday, 11 February 2020 at 19:42:06 UTC, Ali Çehreli wrote:

 On 2/11/20 7:32 AM, Виталий Фадеев wrote:> On Tuesday, 11 
 February 2020 at 15:08:11 UTC, Ali Çehreli wrote:

 On 2/11/20 6:58 AM, Andrea Fontana wrote:


 Analog C-code with macros:
      #define TPL(M,D,CODE) if ( state & M && diraction =










 D )

 








 ^^^^^^^^^^^^^

 The C code apparently does an assignment inside the macro.


 I still think it's a typo. :)

 Ali


 Thank. You understand me rigth, but your presented code too


 big.

 We love simple, beauty.


 I love simple and beautiful more than you do. :) The D code 
 I've shown is virtually identical to the C macro if you rename 
 my 'executeMaybe' to your 'TPL'.

 Ali


Yes, Ali. You really love readable & beauty code!

Check this one:

import std.stdio;


enum int INIT  = 1;
enum int OPEN  = 2;
enum int CLICK = 3;
enum int IN  = 1;
enum int OUT = 2;


class Applications
{
	int state = OPEN;

	void proc( int message, int direction )
	{
		void TPL( Func )( int M, int D, Func func ) {
			if ((state & M) && (direction == D)) {
				func();
			}
		}

		TPL( INIT, 0, {
			writeln("INIT");
		} );

		TPL( CLICK, IN, {
			writeln("CLICK, IN");
		} );

		TPL( OPEN, IN, {
			writeln("OPEN, IN");
		} );

		TPL( OPEN, OUT, {
			writeln("OPEN, OUT");
		} );
	}
}

void main()
{	
	auto apps = new Applications();
	apps.proc( OPEN, OUT );
}
Feb 11 2020
prev sibling parent reply =?UTF-8?B?0JLQuNGC0LDQu9C40Lkg0KTQsNC0?= =?UTF-8?B?0LXQtdCy?= writes:
On Tuesday, 11 February 2020 at 14:58:58 UTC, Andrea Fontana 
wrote:

 On Tuesday, 11 February 2020 at 11:34:49 UTC, Ali Çehreli wrote:

 On 2/11/20 3:14 AM, Виталий Фадеев wrote:> On Tuesday, 11 
 February 2020 at 11:10:44 UTC, Виталий Фадеев wrote:


 Analog C-code with macros:
      #define TPL(M,D,CODE) if ( state & M && diraction = D )


                                                ^^^^^^^^^^^^^
 [...]

 // Option 1: Equivalent of a C macro
 void executeMaybe(Func)(uint M, Direction D, Func func) {
   if ((state & M) && (direction == D)) {
     func();
   }
 }

 [...]

 Ali


 The C code apparently does an assignment inside the macro.


Wow! Thank! I mass.
I was mean comparation:
Analog C-code with macros:
     #define TPL(M,D,CODE) if ( state & M && diraction == D ) CODE;
example code
     TPL( OPEN, OUT,
       {
         delete AppsWindow
         state &= !OPEN
       }
     )

It possible in D ?
How pass code block to template ?
How to solve this problem ?


Sorry. How to delete thread ?
Feb 11 2020
parent reply Steven Schveighoffer <schveiguy gmail.com> writes:
On 2/11/20 10:30 AM, Виталий Фадеев wrote:

 On Tuesday, 11 February 2020 at 14:58:58 UTC, Andrea Fontana wrote:

 On Tuesday, 11 February 2020 at 11:34:49 UTC, Ali Çehreli wrote:

 On 2/11/20 3:14 AM, Виталий Фадеев wrote:> On Tuesday, 11
February 
 2020 at 11:10:44 UTC, Виталий Фадеев wrote:


 Analog C-code with macros:
      #define TPL(M,D,CODE) if ( state & M && diraction = D )


                                     
          ^^^^^^^^^^^^^
 [...]

 // Option 1: Equivalent of a C macro
 void executeMaybe(Func)(uint M, Direction D, Func func) {
   if ((state & M) && (direction == D)) {
     func();
   }
 }

 [...]

 Ali


 The C code apparently does an assignment inside the macro.


 
 Wow! Thank! I mass.
 I was mean comparation:
 Analog C-code with macros:
      #define TPL(M,D,CODE) if ( state & M && diraction == D ) CODE;
 example code
      TPL( OPEN, OUT,
        {
          delete AppsWindow
          state &= !OPEN
        }
      )
 
 It possible in D ?
 How pass code block to template ?
 How to solve this problem ?


D does not have macros. Instead we have mixins. mixins allow you to 
write code as a string, and then interpret the code as if it were typed 
in the given location.

For example (and I'm not sure how you want to deal with M and D, this is 
one possibility):

string TPL(size_t M, SomeType D, string block) { // not sure what type 
of D should be

return "if((state & " ~ M.to!string ~ " && diraction == " ~ D.to!string 
~ ") " ~ block;
}

// usage:

mixin TPL(OPEN, OUT,
q{
     delete AppsWindow;
     state &= !OPEN;
});

-Steve
Feb 11 2020
parent =?UTF-8?B?0JLQuNGC0LDQu9C40Lkg0KTQsNC0?= =?UTF-8?B?0LXQtdCy?= writes:
On Tuesday, 11 February 2020 at 15:51:31 UTC, Steven 
Schveighoffer wrote:

 On 2/11/20 10:30 AM, Виталий Фадеев wrote:

 [...]


 D does not have macros. Instead we have mixins. mixins allow 
 you to write code as a string, and then interpret the code as 
 if it were typed in the given location.

 For example (and I'm not sure how you want to deal with M and 
 D, this is one possibility):

 string TPL(size_t M, SomeType D, string block) { // not sure 
 what type of D should be

 return "if((state & " ~ M.to!string ~ " && diraction == " ~ 
 D.to!string ~ ") " ~ block;
 }

 // usage:

 mixin TPL(OPEN, OUT,
 q{
     delete AppsWindow;
     state &= !OPEN;
 });

 -Steve


Steve, it cool! Thank!
Feb 11 2020