digitalmars.D - Is it possible to call D functions from C++

Namal (3/3) Mar 18 2015 Hello, as in the title. How can I call D functions from C++ (If

Benjamin Thaut (16/19) Mar 18 2015 D:

krzaq (3/23) Mar 18 2015 I'm pretty sure the OP wanted to call D functions from C++, not

Benjamin Thaut (3/5) Mar 18 2015 If you look very closely you will notice that my example does

krzaq (3/9) Mar 18 2015 Oh, right. I'm sorry, I assumed void main() means D, since it's

Kagamin (2/4) Mar 19 2015 C++ allows implementation-defined return type of main.

krzaq (3/10) Mar 19 2015 I'm afraid that you've mistaken C++ for C. The C++ standard quite

Kagamin (2/3) Mar 19 2015 This.

krzaq (4/7) Mar 19 2015 I'm not sure what you're failing to understand here. It **shall*

Kagamin (2/2) Mar 19 2015 Hmm... I read it as "it shall have the return type of int, but if

krzaq (2/4) Mar 19 2015 In that case, I refer you to https://www.ietf.org/rfc/rfc2119.txt

Andre Kostur (4/8) Mar 20 2015 To be picky (because I live in RFCs)... RFC 2119 doesn't have anything

Andrei Alexandrescu (2/4) Mar 19 2015 "shall" is prescriptive in standardese, i.e. means "must". -- Andrei
"Ola Fosheim =?UTF-8?B?R3LDuHN0YWQi?= (3/5) Mar 20 2015 The semantics of returning from main() is defined as:

Daniel Kozak (4/24) Mar 18 2015 he probably will need cal rt_init and rt_term too.
Namal (18/18) Mar 18 2015 alright, thanks alot. Now I have.

Kagamin (3/5) Mar 18 2015 Try C example first:
Benjamin Thaut (3/5) Mar 18 2015 What platform are you on, windows, linux, osx? What c++ compiler

Namal (3/9) Mar 19 2015 Linux, gcc and dmd. In my case c++ refuses to compile

Benjamin Thaut (2/13) Mar 19 2015 well then change it to the full signature ;-)

Chris (4/7) Mar 18 2015 http://dlang.org/cpp_interface.html

"Namal" <sotis22 mail.ru> writes:

Hello, as in the title. How can I call D functions from C++ (If 
my main() is in a c++ file).

Thanks alot!

Mar 18 2015

"Benjamin Thaut" <code benjamin-thaut.de> writes:

On Wednesday, 18 March 2015 at 14:17:13 UTC, Namal wrote:
 Hello, as in the title. How can I call D functions from C++ (If 
 my main() is in a c++ file).

 Thanks alot!

D:

extern(C++) void SomeDFunction()
{
   doSomething();
}

C++:

void SomeDFunction();

void main()
{
   SomeDFunction();
}

Please also see:
http://dlang.org/cpp_interface.html

Kind Regards
Benjamin

Mar 18 2015

"krzaq" <dlangmailinglist krzaq.cc> writes:

On Wednesday, 18 March 2015 at 14:20:19 UTC, Benjamin Thaut wrote:
 On Wednesday, 18 March 2015 at 14:17:13 UTC, Namal wrote:
 Hello, as in the title. How can I call D functions from C++ 
 (If my main() is in a c++ file).

 Thanks alot!

 D:

 extern(C++) void SomeDFunction()
 {
   doSomething();
 }

 C++:

 void SomeDFunction();

 void main()
 {
   SomeDFunction();
 }

 Please also see:
 http://dlang.org/cpp_interface.html

 Kind Regards
 Benjamin

I'm pretty sure the OP wanted to call D functions from C++, not 
C++ functions from D.

Mar 18 2015

"Benjamin Thaut" <code benjamin-thaut.de> writes:

On Wednesday, 18 March 2015 at 14:40:48 UTC, krzaq wrote:
 I'm pretty sure the OP wanted to call D functions from C++, not 
 C++ functions from D.

If you look very closely you will notice that my example does 
exactly what the OP wanted.

Mar 18 2015

"krzaq" <dlangmailinglist krzaq.cc> writes:

On Wednesday, 18 March 2015 at 15:51:28 UTC, Benjamin Thaut wrote:
 On Wednesday, 18 March 2015 at 14:40:48 UTC, krzaq wrote:
 I'm pretty sure the OP wanted to call D functions from C++, 
 not C++ functions from D.

 If you look very closely you will notice that my example does 
 exactly what the OP wanted.

Oh, right. I'm sorry, I assumed void main() means D, since it's 
not legit C++.

Mar 18 2015

"Kagamin" <spam here.lot> writes:

On Wednesday, 18 March 2015 at 15:54:04 UTC, krzaq wrote:
 Oh, right. I'm sorry, I assumed void main() means D, since it's 
 not legit C++.

C++ allows implementation-defined return type of main.

Mar 19 2015

"krzaq" <dlangmailinglist krzaq.cc> writes:

On Thursday, 19 March 2015 at 07:42:48 UTC, Kagamin wrote:
 On Wednesday, 18 March 2015 at 15:54:04 UTC, krzaq wrote:
 Oh, right. I'm sorry, I assumed void main() means D, since 
 it's not legit C++.

 C++ allows implementation-defined return type of main.

I'm afraid that you've mistaken C++ for C. The C++ standard quite 
clearly says:
 An implementation shall not predefine the main function. This 
 function shall not be overloaded. **It shall have a return type 
 of type int**, but otherwise its type is implementation-defined.

Mar 19 2015

"Kagamin" <spam here.lot> writes:

On Thursday, 19 March 2015 at 08:32:10 UTC, krzaq wrote:
 but otherwise its type is implementation-defined.

This.

Mar 19 2015

"krzaq" <dlangmailinglist krzaq.cc> writes:

On Thursday, 19 March 2015 at 08:33:07 UTC, Kagamin wrote:
 On Thursday, 19 March 2015 at 08:32:10 UTC, krzaq wrote:
 but otherwise its type is implementation-defined.

 This.

I'm not sure what you're failing to understand here. It **shall* 
have the return type of int. The rest (as in: parameter list) is 
implementation defined.

Mar 19 2015

"Kagamin" <spam here.lot> writes:

Hmm... I read it as "it shall have the return type of int, but if 
not, then it's implementation-defined".

Mar 19 2015

"krzaq" <dlangmailinglist krzaq.cc> writes:

On Thursday, 19 March 2015 at 08:38:45 UTC, Kagamin wrote:
 Hmm... I read it as "it shall have the return type of int, but 
 if not, then it's implementation-defined".

In that case, I refer you to https://www.ietf.org/rfc/rfc2119.txt

Mar 19 2015

Andre Kostur <andre kostur.net> writes:

On 2015-03-19 1:57 AM, krzaq wrote:
 On Thursday, 19 March 2015 at 08:38:45 UTC, Kagamin wrote:
 Hmm... I read it as "it shall have the return type of int, but if not,
 then it's implementation-defined".

 In that case, I refer you to https://www.ietf.org/rfc/rfc2119.txt

To be picky (because I live in RFCs)... RFC 2119 doesn't have anything 
to say about "shall".  It does have something to say about "SHALL".  The 
capitalization is important.

Mar 20 2015

Andrei Alexandrescu <SeeWebsiteForEmail erdani.org> writes:

On 3/19/15 1:38 AM, Kagamin wrote:
 Hmm... I read it as "it shall have the return type of int, but if not,
 then it's implementation-defined".

"shall" is prescriptive in standardese, i.e. means "must". -- Andrei

Mar 19 2015

"Ola Fosheim =?UTF-8?B?R3LDuHN0YWQi?= writes:

On Thursday, 19 March 2015 at 08:38:45 UTC, Kagamin wrote:
 Hmm... I read it as "it shall have the return type of int, but 
 if not, then it's implementation-defined".


The semantics of returning from main() is defined as:  
std::exit(main(…))

Mar 20 2015

"Daniel Kozak" <kozzi11 gmail.com> writes:

On Wednesday, 18 March 2015 at 14:20:19 UTC, Benjamin Thaut wrote:
 On Wednesday, 18 March 2015 at 14:17:13 UTC, Namal wrote:
 Hello, as in the title. How can I call D functions from C++ 
 (If my main() is in a c++ file).

 Thanks alot!

 D:

 extern(C++) void SomeDFunction()
 {
   doSomething();
 }

 C++:

 void SomeDFunction();

 void main()
 {
   SomeDFunction();
 }

 Please also see:
 http://dlang.org/cpp_interface.html

 Kind Regards
 Benjamin


he probably will need cal rt_init and rt_term too.
similar post with example for C:

http://forum.dlang.org/post/ljgtqa$1qb1$1 digitalmars.com

Mar 18 2015

"Namal" <sotis22 mail.ru> writes:

alright, thanks alot. Now I have.

test.d

import std.stdio;

extern (C++) int foo(int i, int j, int k)
{
     writefln("i = %s", i);
     writefln("j = %s", j);
     writefln("k = %s", k);
     return 1;
}

and main.cpp

int foo(int i, int j, int k);

int main()
{
   foo(1,2,3);
}

Can you help me show how to compile and link it together please, 
thank you.

Mar 18 2015

"Kagamin" <spam here.lot> writes:

On Wednesday, 18 March 2015 at 14:50:21 UTC, Namal wrote:
 Can you help me show how to compile and link it together 
 please, thank you.

Try C example first: 
http://forum.dlang.org/post/qppmeeakboxjzuuwreyy forum.dlang.org

Mar 18 2015

"Benjamin Thaut" <code benjamin-thaut.de> writes:

On Wednesday, 18 March 2015 at 14:50:21 UTC, Namal wrote:
 Can you help me show how to compile and link it together 
 please, thank you.

What platform are you on, windows, linux, osx? What c++ compiler 
do you use? msvc, clang, gcc?

Mar 18 2015

"Namal" <sotis22 mail.ru> writes:

On Wednesday, 18 March 2015 at 15:52:33 UTC, Benjamin Thaut wrote:
 On Wednesday, 18 March 2015 at 14:50:21 UTC, Namal wrote:
 Can you help me show how to compile and link it together 
 please, thank you.

 What platform are you on, windows, linux, osx? What c++ 
 compiler do you use? msvc, clang, gcc?


Linux, gcc and dmd.  In my case c++ refuses to compile
if main is void.

Mar 19 2015

"Benjamin Thaut" <code benjamin-thaut.de> writes:

On Thursday, 19 March 2015 at 11:47:37 UTC, Namal wrote:
 On Wednesday, 18 March 2015 at 15:52:33 UTC, Benjamin Thaut 
 wrote:
 On Wednesday, 18 March 2015 at 14:50:21 UTC, Namal wrote:
 Can you help me show how to compile and link it together 
 please, thank you.

 What platform are you on, windows, linux, osx? What c++ 
 compiler do you use? msvc, clang, gcc?


 Linux, gcc and dmd.  In my case c++ refuses to compile
 if main is void.

well then change it to the full signature ;-)

Mar 19 2015

"Chris" <wendlec tcd.ie> writes:

On Wednesday, 18 March 2015 at 14:17:13 UTC, Namal wrote:
 Hello, as in the title. How can I call D functions from C++ (If 
 my main() is in a c++ file).

 Thanks alot!

http://dlang.org/cpp_interface.html
http://dlang.org/interfaceToC.html

There is also D.learn ;)

Mar 18 2015

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digitalmars.D - Is it possible to call D functions from C++