• Namal (10/10) Jan 06 2016 Hello,
• Adam D. Ruppe (6/12) Jan 06 2016 In every file that you use it, yes. Module imports are private to
• Namal (4/5) Jan 06 2016 I just tried to import one module with a main into another, but I
• Adam D. Ruppe (3/5) Jan 06 2016 You can't have two mains, but you can import a module with main
• Namal (3/8) Jan 06 2016 How can I produce a program file from that module which has no
• tcak (20/30) Jan 06 2016 I think the below example clarifies everything.

Namal <sotis22 mail.ru> writes:

Hello,

finally I want to learn how to do it right and I tried to 
understand it from here

https://en.wikibooks.org/wiki/D_(The_Programming_Language)/d2/Modules

But I have a few questions. Do I have always to include std.stdio 
in every file like in the example or is it enough just to import 
a module which has this already included?

Why do I need to define my main as the main module? I can't 
imagine that I can import it somewhere else.

Is there something like #pragma once that needs to be done?

Adam D. Ruppe <destructionator gmail.com> writes:

On Wednesday, 6 January 2016 at 22:06:32 UTC, Namal wrote:
 Do I have always to include std.stdio in every file like in the 
 example or is it enough just to import a module which has this 
 already included?

In every file that you use it, yes. Module imports are private to 
the module (well, unless you specifically mark them as public) 
which is different than C includes.

 Why do I need to define my main as the main module? I can't 
 imagine that I can import it somewhere else.

You can import it as long as you define it!

 Is there something like #pragma once that needs to be done?

no need

Namal <sotis22 mail.ru> writes:

On Wednesday, 6 January 2016 at 22:15:43 UTC, Adam D. Ruppe wrote:

 You can import it as long as you define it!

I just tried to import one module with a main into another, but I 
get this:

Error: only one main allowed

Adam D. Ruppe <destructionator gmail.com> writes:

On Wednesday, 6 January 2016 at 23:00:43 UTC, Namal wrote:
 I just tried to import one module with a main into another, but 
 I get this:

You can't have two mains, but you can import a module with main 
from another module without one.

Namal <sotis22 mail.ru> writes:

On Wednesday, 6 January 2016 at 23:06:38 UTC, Adam D. Ruppe wrote:
 On Wednesday, 6 January 2016 at 23:00:43 UTC, Namal wrote:
 I just tried to import one module with a main into another, 
 but I get this:

 You can't have two mains, but you can import a module with main 
 from another module without one.

How can I produce a program file from that module which has no 
main but uses some functions from main module?

tcak <1ltkrs+3wyh1ow7kzn1k sharklasers.com> writes:

On Wednesday, 6 January 2016 at 23:12:27 UTC, Namal wrote:
 On Wednesday, 6 January 2016 at 23:06:38 UTC, Adam D. Ruppe 
 wrote:
 On Wednesday, 6 January 2016 at 23:00:43 UTC, Namal wrote:
 I just tried to import one module with a main into another, 
 but I get this:

 You can't have two mains, but you can import a module with 
 main from another module without one.

 How can I produce a program file from that module which has no 
 main but uses some functions from main module?

I think the below example clarifies everything.

entry.d
=======

module project.entry;

import std.stdio;
import project.other;

void bark(){
	writeln("Woof");
}

void main(){
	project.other.callbark();	
}




other.d
=======

module project.other;

import project.entry;

void callbark(){
	project.entry.bark();
}