Re: Pointer to private structure

2016-12-19 Thread Nikhil Jacob via Digitalmars-d-learn

On Monday, 19 December 2016 at 10:14:49 UTC, Ali wrote:

On Monday, 19 December 2016 at 06:42:27 UTC, Nikhil Jacob wrote:

[...]


What're you trying to do here?

Forward declarations in C++ are used to solve a few different 
things:

1. Reduce build times (unneeded in D AFAIK)
2. Break cyclic references (unneeded in D again?)
3. Give APIs visibility (D's modules and Access layers solve 
this)
4. Maintain binary compatibility while allowing internal data 
changes (aka pimlp idiom) <-- This I believe you cannot do in D 
- https://wiki.dlang.org/Access_specifiers_and_visibility 
(someone correct me if I'm wrong)


I've seen something about .di files in D. But they seem flakey 
a bit.


I was trying to do something similar to pimlp idiom.

But after thinking over it, I found a better way in D.

Thanks for pointing to the wiki


Re: Pointer to private structure

2016-12-19 Thread Ali via Digitalmars-d-learn

On Monday, 19 December 2016 at 06:42:27 UTC, Nikhil Jacob wrote:

On Monday, 19 December 2016 at 06:21:10 UTC, ketmar wrote:
i bet that just trying this with D compiler will take less 
time than writing forum post.


I did try but it seems to give compilation failure... Let me 
try once more and I will get back with more details.


What're you trying to do here?

Forward declarations in C++ are used to solve a few different 
things:

1. Reduce build times (unneeded in D AFAIK)
2. Break cyclic references (unneeded in D again?)
3. Give APIs visibility (D's modules and Access layers solve this)
4. Maintain binary compatibility while allowing internal data 
changes (aka pimlp idiom) <-- This I believe you cannot do in D - 
https://wiki.dlang.org/Access_specifiers_and_visibility (someone 
correct me if I'm wrong)


I've seen something about .di files in D. But they seem flakey a 
bit.




Re: Pointer to private structure

2016-12-18 Thread Nikhil Jacob via Digitalmars-d-learn

On Monday, 19 December 2016 at 06:21:10 UTC, ketmar wrote:
i bet that just trying this with D compiler will take less time 
than writing forum post.


I did try but it seems to give compilation failure... Let me try 
once more and I will get back with more details.


Re: Pointer to private structure

2016-12-18 Thread ketmar via Digitalmars-d-learn
i bet that just trying this with D compiler will take less time 
than writing forum post.


Re: Pointer to private structure

2016-12-18 Thread Nicholas Wilson via Digitalmars-d-learn

On Monday, 19 December 2016 at 05:51:09 UTC, Nikhil Jacob wrote:
In C, we can define a struct without body in an include file 
and use pointer to that structure


For examples in public header file.

struct data;
data* new_data();


We can then define the elements of struct data privately inside 
the implementation of library.


Can we do this in D without using void* ?


Yes.


Pointer to private structure

2016-12-18 Thread Nikhil Jacob via Digitalmars-d-learn
In C, we can define a struct without body in an include file and 
use pointer to that structure


For examples in public header file.

struct data;
data* new_data();


We can then define the elements of struct data privately inside 
the implementation of library.


Can we do this in D without using void* ?