http://d.puremagic.com/issues/show_bug.cgi?id=9608
Summary: Add introspection for templates
Product: D
Version: D2
Platform: All
OS/Version: All
Status: NEW
Severity: enhancement
Priority: P2
Component: DMD
AssignedTo: [email protected]
ReportedBy: [email protected]
--- Comment #0 from Andrei Alexandrescu <[email protected]> 2013-02-27 05:12:46
PST ---
Currently given a template symbol it's not possible to do simple introspection
on it, such as getting arity, distinguishing alias vs. type parameters, and
figuring out variadics.
Example:
template A(alias sym)
{
...
}
A!((a, b) => a.name < b.name);
A is unable to tell the number of parameters of the lambda. It could if it knew
what type to instantiate it, and in order to know that it needs the actual
instantiation type. There should be enough introspection chops to compute the
number of parameters without instantiating the lambda.
There would be a fair amount of design involved because currently there's no
kind that expresses a template's parameters outside the template.
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