• Uplink_Coder (17/17) Oct 31 2013 (this is my first post so please alert me to any breaches of
• Uplink_Coder (5/5) Oct 31 2013 Maybe I shuold be more specific :
• John Colvin (11/16) Oct 31 2013 void foo(T,U)(U arg){}
• Uplink_Coder (9/9) Oct 31 2013 by changeing

"Uplink_Coder" <someemail someprovider.some> writes:

(this is my first post so please alert me to any breaches of 
forum etiquette)

Hello,
I have a problem with a helper function I'm writeting.

T[] makeArray(T,U)(immutable U[] paramArray) {
  	T[] result;
  	foreach (param;paramArray) {
		result ~= T(param);
  	}
  	return result;
}

and I would like not to take the compile-time-parameter U but 
insead infering it form the argumet.

is it possible ?
and if. how ?

----

Uplink_Coder

"Uplink_Coder" <someemail someprovider.some> writes:

Maybe I shuold be more specific :
for now It's:
T[] arr = makeArray!(T,U)([some,instances,of,U]);

but I would like it to be:

auto arr = makeArray!(T)([some,instances,of,U]);

"John Colvin" <john.loughran.colvin gmail.com> writes:

On Thursday, 31 October 2013 at 10:18:25 UTC, Uplink_Coder wrote:
 Maybe I shuold be more specific :
 for now It's:
 T[] arr = makeArray!(T,U)([some,instances,of,U]);

 but I would like it to be:

 auto arr = makeArray!(T)([some,instances,of,U]);

void foo(T,U)(U arg){}

int a;
foo!(double)(a); //U is inferred as int


void bar(T,U)(U[] arg){}

long[] b;
foo!(double)(b); //U is in inferred as long


However, be aware that you can't pass mutable or const data as an 
immutable argument. Perhaps the signature that would work better 
for you would be

T[] makeArray(T,U)(const U[] paramArray)

"Uplink_Coder" <someemail someprovider.some> writes:

by changeing
T[] makeArray(T,U)(immutable U[] paramArray)
into
T[] makeArray(T,U)(const U paramArray) if (isAggregateType!(U) || 
is Array!(U))
everything works perfectly

Thanks very much

---
Uplink_Coder