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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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10
compiler/semdata.nim
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@ -180,14 +180,16 @@ proc addToLib(lib: PLib, sym: PSym) =
sym.annex = lib
proc makePtrType(c: PContext, baseType: PType): PType =
if (baseType == nil): InternalError("makePtrType")
result = newTypeS(tyPtr, c)
addSon(result, baseType)
addSon(result, baseType.AssertNotNil)
proc makeVarType(c: PContext, baseType: PType): PType =
if (baseType == nil): InternalError("makeVarType")
result = newTypeS(tyVar, c)
addSon(result, baseType)
addSon(result, baseType.AssertNotNil)
proc makeTypeDesc*(c: PContext, typ: PType): PType =
result = newTypeS(tyTypeDesc, c)
result.addSon(typ.AssertNotNil)
proc newTypeS(kind: TTypeKind, c: PContext): PType =
result = newType(kind, getCurrOwner())