Import proposals (Discuss)

[Jari-Matti Mäkelä]

Regan Heath wrote:
> 1. starting with hello world, eg.
> 
> --[helloworld.d]--
> import std.stdio;
> void main()
> {
>   writefln("Hello World");
> }
> 
> 2. Moving on to import his own module eg.
> 
> --[mymod.d]--
> void sayHello() { writefln("Hello World"); }
> 
> --[helloworld.d]--
> import std.stdio,mymod;
> void main()
> {
>   sayHello();
> }
> 
> which will all work fine, no problems.
> 
> 3. It's when he starts to think.. "I just need writefln why not code it
> like this" ..
> 
> --[mymod.d]--
> void sayHello() { writefln("Hello World"); }
> 
> --[helloworld.d]--
> import std.stdio.writefln,mymod;
> void main()
> {
>   sayHello();
> }
> 
> that he'll get an error.

Of course he gets an error. How are you supposed to compile these
modules separately (ie. dmd -c mymod.d). It should be:

[mymod.d]
import std.stdio.writefln;
void sayHello() { writefln("Hello World"); }

[helloworld.d]
import mymod;
// or even: import mymod.sayHello;

void main()
{
  sayHello();
}

If you think of mymod.d as a library, how can it depend on an import
statement on a "client" module that is not possibly even implemented yet?

-- 
Jari-Matti