Code block as template argument

[drug]

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.