• cmplx (23/23) Jul 16 2013 Example of recursive templates in
• Adam D. Ruppe (12/14) Jul 16 2013 In D, .name means "look up name in the global scope". Since
• cmplx (3/17) Jul 16 2013 Compile error:
• Adam D. Ruppe (2/4) Jul 16 2013 Are you sure the int a = 10; was copied outside the function too?
• cmplx (4/9) Jul 16 2013 yes, you are right, 'a' has been initialised in the 'main' and

"cmplx" <magiisto mail.ru> writes:

Example of recursive templates in 
http://dlang.org/template-comparison.html

template factorial(int n) {
        const factorial = n * factorial!(n-1);
  }
template factorial(int n : 1) {
          const factorial = 1;
  }

void test() {
	writefln("%d", factorial!(4)); // prints 24
}

But I was wrong when I tried this example and put point before 
the factorial. But it still worked. why?

template factorial(int n) {
        const factorial = n * .factorial!(n-1);//<------
  }
template factorial(int n : 1) {
          const factorial = 1;
  }
void test() {
	writefln("%d", factorial!(4)); // prints 24
}

I`m using DMD 2.063

"Adam D. Ruppe" <destructionator gmail.com> writes:

On Tuesday, 16 July 2013 at 21:03:07 UTC, cmplx wrote:
 But I was wrong when I tried this example and put point before 
 the factorial. But it still worked. why?

In D, .name means "look up name in the global scope". Since 
factorial is in the global scope, it found it successfully and 
everything worked.

The place this would be useful is something like this:


int a = 10;

void foo() {
    int a = 20;
    writeln(a); // 20
    writeln(.a); // 10 - the dot tells it to use the global 
instead of the local
}

"cmplx" <magiisto mail.ru> writes:

On Tuesday, 16 July 2013 at 21:07:31 UTC, Adam D. Ruppe wrote:
 On Tuesday, 16 July 2013 at 21:03:07 UTC, cmplx wrote:
 But I was wrong when I tried this example and put point before 
 the factorial. But it still worked. why?

 In D, .name means "look up name in the global scope". Since 
 factorial is in the global scope, it found it successfully and 
 everything worked.

 The place this would be useful is something like this:


 int a = 10;

 void foo() {
    int a = 20;
    writeln(a); // 20
    writeln(.a); // 10 - the dot tells it to use the global 
 instead of the local
 }

Compile error:
Error: undefined identifier 'a'

"Adam D. Ruppe" <destructionator gmail.com> writes:

On Tuesday, 16 July 2013 at 22:12:36 UTC, cmplx wrote:

 Compile error:
 Error: undefined identifier 'a'

Are you sure the int a = 10; was copied outside the function too?

"cmplx" <magiisto mail.ru> writes:

On Tuesday, 16 July 2013 at 22:17:58 UTC, Adam D. Ruppe wrote:
 On Tuesday, 16 July 2013 at 22:12:36 UTC, cmplx wrote:

 Compile error:
 Error: undefined identifier 'a'

 Are you sure the int a = 10; was copied outside the function 
 too?

yes, you are right, 'a' has been initialised in the 'main' and 
therefore was a mistake
thank you