Merge pull request #586 from mflamer/master

Add arity typetrait
2013-09-03 09:05:12 -07:00 · 2013-09-03 09:05:12 -07:00 · 6fa72c5d9d
commit 6fa72c5d9d
parent 6a04757e6d 73aba23a49
2 changed files with 6 additions and 0 deletions
--- a/compiler/evals.nim
+++ b/compiler/evals.nim
@ -914,6 +914,10 @@ proc evalTypeTrait*(trait, operand: PNode, context: PSym): PNode =
    result = newStrNode(nkStrLit, typ.typeToString(preferName))
    result.typ = newType(tyString, context)
    result.info = trait.info
+  of "arity":    
+    result = newIntNode(nkIntLit, typ.n.len-1)
+    result.typ = newType(tyInt, context)
+    result.info = trait.info
  else:
    internalAssert false

--- a/lib/pure/typetraits.nim
+++ b/lib/pure/typetraits.nim
@ -13,3 +13,5 @@
 proc name*(t: typedesc): string {.magic: "TypeTrait".}
  ## Returns the name of the given type

+proc arity*(t: typedesc): int {.magic: "TypeTrait".}
+  ## Returns the arity of the given type