version(Main) like python's __name__ == "__main__"

[Lars Ivar Igesund]

Lionello Lunesu wrote:

> I'd like to suggest a new predefined version identifier called "Main"
> which is defined on the main module only. The definition of "main
> module" would be:
> 
> * the first module on the command line, or
> * the module whose name will be used for the executable, or
> * the module mentioned after DMD's "-run"
> 
> The two issues with this suggestion are:
> 
> * vagueness of the definition of "main module"
> * Main version identifier is set for one module only (by definition)
> 
> It's use would be similar to Python's "__main__" [1]:
> 
> version(Main)
> {
> void main()
> {
>    // test code
> }
> }
> 
> It would allow one to write small examples/tests in each module, that
> can be executed immediately, but won't cause conflicts when linked
> against in a larger project.
> 
> L.
> 
> [1] http://docs.python.org/lib/module-main.html

We tend to add such simple tests within

debug (ModuleName) {
 
void main() { blah }

}

then compile with dmd -debug=ModuleName

I find this solution more than easy enough and possibly more flexible? There
may be other usecases where such a Main version identifier would be of
interest though.

-- 
Lars Ivar Igesund
blog at http://larsivi.net
DSource, #d.tango & #D: larsivi
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