• canalpay <canalpayciftci gmail.com> Jul 14 2010
• bearophile <bearophileHUGS lycos.com> Jul 14 2010
• canalpay <canalpayciftci gmail.com> Jul 14 2010
• bearophile <bearophileHUGS lycos.com> Jul 14 2010
• Don <nospam nospam.com> Jul 14 2010

canalpay <canalpayciftci gmail.com> writes:

void main()
{
    T input(T)()
    {}
 
    T input(T : string)()
    {}
}

Error message :

isimsiz.d(6): found 'input' when expecting ';' following statement
isimsiz.d(6): found ':' when expecting ')'
isimsiz.d(6): found 'string' when expecting ';' following statement
isimsiz.d(6): found ')' instead of statement
isimsiz.d(8): unrecognized declaration
 
Shouldn't that work?

And

void main()
{
    void input(T)()
    {}
 
    void input(T : string)()
    {}
}

Again, Shouldn't that work?

Error message:
isimsiz.d(6): Error: declaration input(T : string) is already defined

there is no problem when the templates are in the global namespace.

bearophile <bearophileHUGS lycos.com> writes:

canalpay:
 void main()
 {
     T input(T)()
     {}
  
     T input(T : string)()
     {}
 }


In D2 you can't define templates inside functions.

Bye,
bearophile

canalpay <canalpayciftci gmail.com> writes:

bearophile Wrote:
 In D2 you can't define templates inside functions.
 
 Bye,
 bearophile


Thanks, But this example works:
void main()
{
    T input(T)()
    {}

}

 Why ?

bearophile <bearophileHUGS lycos.com> writes:

canalpay:
 Thanks, But this example works:
 void main()
 {
     T input(T)()
     {}
 
 }
 
  Why ?


You are right. Beside allowing nested functions (this is well known), it seems
D2 also accepts the definition (with template constraint too) and instantiation
of simple templates inside functions, I didn't know this.

But currently nested functions can't be overloaded. Probably for similar
reasons inside a function you can't define more than one template with the same
name. I presume this limit can be removed, so if you really need this you can
ask for an enhancement request and if you can add a patch too to increase a bit
the probability to see it fulfilled someday.

Bye,
bearophile

Don <nospam nospam.com> writes:

bearophile wrote:
 canalpay:
 Thanks, But this example works:
 void main()
 {
     T input(T)()
     {}

 }

  Why ?


 You are right. Beside allowing nested functions (this is well known), it seems
D2 also accepts the definition (with template constraint too) and instantiation
of simple templates inside functions, I didn't know this.
 
 But currently nested functions can't be overloaded. Probably for similar
reasons inside a function you can't define more than one template with the same
name. I presume this limit can be removed, so if you really need this you can
ask for an enhancement request and if you can add a patch too to increase a bit
the probability to see it fulfilled someday.
 
 Bye,
 bearophile


The spec explicitly says:
"Unlike module level declarations, declarations within function scope 
are processed in order. This means that two nested functions cannot 
mutually call each other:

[snip]

Future directions: This restriction may be removed."

My guess is that it will become possible eventually.