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typedesc and expr params

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types are now valid proc/template/macro params and you can overload over them:
proc foo(T: typedesc)        # accept any type
proc foo(T: typedesc{int}) # overload specifically for int
proc foo(T: typedesc{int or float or Callable}) # overload for any type matching the constraints

expr{type} is a param expecting compile time value of the designated type (or type class).

when typedesc or expr params are used with a proc, the proc will be instantiated once
for each unique type/value used as parameter.
This commit is contained in:
Zahary Karadjov 2012-03-29 16:03:51 +03:00
commit 22dc76a361
14 changed files with 218 additions and 45 deletions
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2
compiler/seminst.nim
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@ -20,7 +20,7 @@ proc instantiateGenericParamList(c: PContext, n: PNode, pt: TIdTable,
if a.kind != nkSym:
InternalError(a.info, "instantiateGenericParamList; no symbol")
var q = a.sym
if q.typ.kind notin {tyTypeDesc, tyGenericParam, tyTypeClass}: continue
if q.typ.kind notin {tyTypeDesc, tyGenericParam, tyTypeClass, tyExpr}: continue
var s = newSym(skType, q.name, getCurrOwner())
s.info = q.info
s.flags = s.flags + {sfUsed, sfFromGeneric}