• bioinfornatics (10/10) Nov 30 2013 I write a function with Lambda expression + safe + pure wich do
• =?UTF-8?B?QWxpIMOHZWhyZWxp?= (14/23) Dec 01 2013 The obvious problem in the code is the fact that although the intent and...
• bioinfornatics (3/34) Dec 01 2013 Thanks Ali,

"bioinfornatics" <bioinfornatics fedoraproject.org> writes:

I write a function with Lambda expression + safe + pure wich do 
same (close) as countUntil

http://www.dpaste.dzfl.pl/63d03540

but i fail to use lambda expression into my function. I try by 
two way
- alias this pred … (to get a default lambda)
- function(…) pred

both way i fail, could you take a look to code please.

Goal is to get a pure and safe function

thanks

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

On 11/30/2013 05:53 PM, bioinfornatics wrote:

 I write a function with Lambda expression + safe + pure wich do same
 (close) as countUntil

 http://www.dpaste.dzfl.pl/63d03540

 but i fail to use lambda expression into my function. I try by two way
 - alias this pred … (to get a default lambda)
 - function(…) pred

 both way i fail, could you take a look to code please.

 Goal is to get a pure and safe function

 thanks

The obvious problem in the code is the fact that although the intent and 
the lambda expression itself is written to take two parameters, the 
lambda is called without any arguments:

1) The default lambda takes two parameters:

   auto search( alias pred = (a,b) => a == b, R,T,S=T)( const ref R 
toSearch, in T toMatch ) pure

2) and the provided lambda takes two parameters:

	assert( arrStruct.search!( (a,b) => a.id == b )( 8uL ) == 7 );

3) However, the call itself takes no arguments:

               if( pred() ){

So, I would start with that call to debug and pass the two arguments 
that are appropriate (toSearch.front and toMatch, perhaps?)

Ali

"bioinfornatics" <bioinfornatics fedoraproject.org> writes:

On Sunday, 1 December 2013 at 08:22:41 UTC, Ali Çehreli wrote:
 On 11/30/2013 05:53 PM, bioinfornatics wrote:

 I write a function with Lambda expression + safe + pure wich

 do same
 (close) as countUntil

 http://www.dpaste.dzfl.pl/63d03540

 but i fail to use lambda expression into my function. I try

 by two way
 - alias this pred … (to get a default lambda)
 - function(…) pred

 both way i fail, could you take a look to code please.

 Goal is to get a pure and safe function

 thanks

 The obvious problem in the code is the fact that although the 
 intent and the lambda expression itself is written to take two 
 parameters, the lambda is called without any arguments:

 1) The default lambda takes two parameters:

   auto search( alias pred = (a,b) => a == b, R,T,S=T)( const 
 ref R toSearch, in T toMatch ) pure

 2) and the provided lambda takes two parameters:

 	assert( arrStruct.search!( (a,b) => a.id == b )( 8uL ) == 7 );

 3) However, the call itself takes no arguments:

               if( pred() ){

 So, I would start with that call to debug and pass the two 
 arguments that are appropriate (toSearch.front and toMatch, 
 perhaps?)

 Ali

Thanks Ali,

that works now, i was close. http://www.dpaste.dzfl.pl/63d03540