• Yuushi (12/12) Jun 24 2014 I was wondering if D had something akin to std::function in C++.
• Mike Parker (12/24) Jun 24 2014 For function pointers (free functions or static class functions):
• Mike Parker (6/34) Jun 24 2014 And in this case you want the latter:
• Yuushi (3/50) Jun 24 2014 Thanks a ton - I guess I need to do a fair bit more reading about
• Olivier Pisano (3/5) Jun 24 2014 In this case, alias acts as typedef in C++. What is important
• Yuushi (8/14) Jun 24 2014 Yeah, I realised that when I went back and looked at what I'd
• =?UTF-8?B?QWxpIMOHZWhyZWxp?= (5/11) Jun 25 2014 That gets me all the time! :-/ That is the long version of the function
• =?UTF-8?B?QWxpIMOHZWhyZWxp?= (4/5) Jun 24 2014 It is probably too basic for you but somebody else may find it useful:

"Yuushi" <ShinomoriAoshi13 gmail.com> writes:

I was wondering if D had something akin to std::function in C++.

Say I have some functions in an associative array, for example:

      auto mapping = ['!' : (string a) => toUpper!string(a), '^' : 
(string a) => capitalize!string(a)];

What I want to do is basically declare something like:

     function string(string) transform;
     if(<some condition>) {
          transform = mapping[<lookup>];
     }

In C++, this could be done by declaring:

      std::function<string(string)> transform;

Is there an equivalent D construct for this?

Mike Parker <aldacron gmail.com> writes:

On 6/25/2014 10:10 AM, Yuushi wrote:
 I was wondering if D had something akin to std::function in C++.

 Say I have some functions in an associative array, for example:

       auto mapping = ['!' : (string a) => toUpper!string(a), '^' :
 (string a) => capitalize!string(a)];

 What I want to do is basically declare something like:

      function string(string) transform;
      if(<some condition>) {
           transform = mapping[<lookup>];
      }

 In C++, this could be done by declaring:

       std::function<string(string)> transform;

 Is there an equivalent D construct for this?

For function pointers (free functions or static class functions):

alias TransformFunc = string function( string );
TransformFunc transform;

if( foo ) transform = &func;

For delegates (lambdas or pointers to class methods or inner functions):

alias TransformDg = string delegate( string );
TransformDG transform;

if( foo ) transform = &bar.method;

---
This email is free from viruses and malware because avast! Antivirus protection
is active.
http://www.avast.com

Mike Parker <aldacron gmail.com> writes:

On 6/25/2014 10:45 AM, Mike Parker wrote:
 On 6/25/2014 10:10 AM, Yuushi wrote:
 I was wondering if D had something akin to std::function in C++.

 Say I have some functions in an associative array, for example:

       auto mapping = ['!' : (string a) => toUpper!string(a), '^' :
 (string a) => capitalize!string(a)];

 What I want to do is basically declare something like:

      function string(string) transform;
      if(<some condition>) {
           transform = mapping[<lookup>];
      }

 In C++, this could be done by declaring:

       std::function<string(string)> transform;

 Is there an equivalent D construct for this?

 For function pointers (free functions or static class functions):

 alias TransformFunc = string function( string );
 TransformFunc transform;

 if( foo ) transform = &func;

 For delegates (lambdas or pointers to class methods or inner functions):

 alias TransformDg = string delegate( string );
 TransformDG transform;

 if( foo ) transform = &bar.method;

And in this case you want the latter:

TransformDg transform = mapping[ '!' ];


---
This email is free from viruses and malware because avast! Antivirus protection
is active.
http://www.avast.com

"Yuushi" <ShinomoriAoshi13 gmail.com> writes:

On Wednesday, 25 June 2014 at 01:47:13 UTC, Mike Parker wrote:
 On 6/25/2014 10:45 AM, Mike Parker wrote:
 On 6/25/2014 10:10 AM, Yuushi wrote:
 I was wondering if D had something akin to std::function in 
 C++.

 Say I have some functions in an associative array, for 
 example:

      auto mapping = ['!' : (string a) => toUpper!string(a), 
 '^' :
 (string a) => capitalize!string(a)];

 What I want to do is basically declare something like:

     function string(string) transform;
     if(<some condition>) {
          transform = mapping[<lookup>];
     }

 In C++, this could be done by declaring:

      std::function<string(string)> transform;

 Is there an equivalent D construct for this?

 For function pointers (free functions or static class 
 functions):

 alias TransformFunc = string function( string );
 TransformFunc transform;

 if( foo ) transform = &func;

 For delegates (lambdas or pointers to class methods or inner 
 functions):

 alias TransformDg = string delegate( string );
 TransformDG transform;

 if( foo ) transform = &bar.method;

 And in this case you want the latter:

 TransformDg transform = mapping[ '!' ];


 ---
 This email is free from viruses and malware because avast! 
 Antivirus protection is active.
 http://www.avast.com

Thanks a ton - I guess I need to do a fair bit more reading about 
alias.

"Olivier Pisano" <olivier.pisano laposte.net> writes:

On Wednesday, 25 June 2014 at 03:33:15 UTC, Yuushi wrote:
 Thanks a ton - I guess I need to do a fair bit more reading 
 about alias.

In this case, alias acts as typedef in C++. What is important 
here is the function pointers/delegates syntax.

"Yuushi" <ShinomoriAoshi13 gmail.com> writes:

On Wednesday, 25 June 2014 at 05:13:00 UTC, Olivier Pisano wrote:
 On Wednesday, 25 June 2014 at 03:33:15 UTC, Yuushi wrote:
 Thanks a ton - I guess I need to do a fair bit more reading 
 about alias.

 In this case, alias acts as typedef in C++. What is important 
 here is the function pointers/delegates syntax.

Yeah, I realised that when I went back and looked at what I'd 
tried:

      function string(string) transform;

which should have been:

     string function(string) transform;

which does work.

Thanks for the clarification.

=?UTF-8?B?QWxpIMOHZWhyZWxp?= <acehreli yahoo.com> writes:

On 06/24/2014 11:23 PM, Yuushi wrote:

 Yeah, I realised that when I went back and looked at what I'd tried:

       function string(string) transform;

That gets me all the time! :-/ That is the long version of the function 
literal syntax:

     auto f = function string(string s) { return "hello"; };

 which should have been:

      string function(string) transform;

 which does work.

 Thanks for the clarification.

Ali

=?UTF-8?B?QWxpIMOHZWhyZWxp?= <acehreli yahoo.com> writes:

On 06/24/2014 08:33 PM, Yuushi wrote:

 I guess I need to do a fair bit more reading about alias.

It is probably too basic for you but somebody else may find it useful:

  http://ddili.org/ders/d.en/lambda.html

Ali