How to detect a lambda expression get it is signature

Hi i am looking how to perform this action with traits. Below some code to show what it fail Regards ---- CODE import std.traits : isDelegate, isSomeFunction, MemberFunctionsTuple, ParameterIdentifierTuple; struct section( alias start, alias end ) { alias checkStart = start; alias checkEnd = end; } void main() { alias tmp = bool delegate( string ); // what i would like to get alias s = section!( (word) => word =="a" , (word) => word == "b" ); pragma( msg, isSomeFunction!(s.checkStart) ); // false pragma( msg, isDelegate!(s.checkStart) ); // false pragma( msg, __traits(identifier, s.checkStart) ); // __lambda1 pragma( msg, ParameterIdentifierTuple!(s.checkStart) ); // error pragma( msg, MemberFunctionsTuple!( s.checkStart ) ); // error }

June 02, 2014

Re: How to detect a lambda expression get it is signature

Posted by Jacob Carlborg
in reply to bioinfornatics

Permalink

Jacob Carlborg

Posted in reply to bioinfornatics

Permalink

On 02/06/14 01:00, bioinfornatics wrote:
> Hi i am looking how to perform this action with traits. Below
> some code to show what it fail
>
>
> Regards
>
>
> ---- CODE
> import std.traits       : isDelegate, isSomeFunction,
> MemberFunctionsTuple, ParameterIdentifierTuple;
>
>
> struct section( alias start, alias end )
> {
>       alias checkStart = start;
>       alias checkEnd = end;
> }
>
> void main()
> {
>       alias tmp = bool delegate( string ); // what i would like to
> get
>       alias s = section!( (word) => word =="a" , (word) => word ==
> "b" );
>       pragma( msg, isSomeFunction!(s.checkStart) );           //
> false
>       pragma( msg, isDelegate!(s.checkStart) );               //
> false
>       pragma( msg, __traits(identifier, s.checkStart) );      //
> __lambda1
>       pragma( msg, ParameterIdentifierTuple!(s.checkStart) ); //
> error
>       pragma( msg, MemberFunctionsTuple!( s.checkStart ) );   //
> error
> }

Have a look at this thread: http://forum.dlang.org/thread/lkl0lp$204h$1@digitalmars.com

-- 
/Jacob Carlborg

Forums