Better bitsof implementation (#74)

See https://github.com/nim-lang/Nim/issues/9494

stint/int_public.nim

@@ -9,7 +9,7 @@
 
 import ./private/datatypes, macros
 export StInt
-export IntImpl, intImpl # TODO remove the need to export these
+export IntImpl, intImpl, bitsof # TODO remove the need to export these
 
 template make_unary(op, ResultTy): untyped =
   func `op`*(x: Stint): ResultTy {.inline.} =

stint/private/datatypes.nim

@@ -166,32 +166,13 @@ type
   StInt*[bits: static[int]] = object
     data*: intImpl(bits)
 
-template bitsof*(x: SomeInteger): int = sizeof(x) * 8
 
-# XXX: https://github.com/nim-lang/Nim/issues/9494 - the extra overloads
-#      can eventually be collapsed to one..
-template bitsof*(x: UintImpl[SomeInteger]): untyped =
-  2 * bitsof(x.lo)
-template bitsof*(x: UintImpl[UintImpl[SomeInteger]]): untyped =
-  2 * bitsof(x.lo)
-template bitsof*(x: UintImpl[UintImpl[UintImpl[SomeInteger]]]): untyped =
-  2 * bitsof(x.lo)
-template bitsof*(x: UintImpl[UintImpl[UintImpl[UintImpl[SomeInteger]]]]): untyped =
-  2 * bitsof(x.lo)
-template bitsof*(x: UintImpl[UintImpl[UintImpl[UintImpl[UintImpl[SomeInteger]]]]]): untyped =
-  2 * bitsof(x.lo)
-template bitsof*(x: UintImpl[UintImpl[UintImpl[UintImpl[UintImpl[UintImpl[SomeInteger]]]]]]): untyped =
-  # Uint2048 - eth-bloom
-  2 * bitsof(x.lo)
-template bitsof*(x: UintImpl[UintImpl[UintImpl[UintImpl[UintImpl[UintImpl[UintImpl[SomeInteger]]]]]]]): untyped =
-  # Uint4096 - modExp in Nimbus
-  2 * bitsof(x.lo)
-template bitsof*(x: UintImpl[UintImpl[UintImpl[UintImpl[UintImpl[UintImpl[UintImpl[UintImpl[SomeInteger]]]]]]]]): untyped =
-  # Uint8192 - modExp in Nimbus
-  2 * bitsof(x.lo)
-
-template bitsof*(x: IntImpl): untyped =
-  2 * bitsof(x.lo)
+template bitsof*(x: SomeInteger): untyped =
+  sizeof(x) * 8
+template bitsof*(x: UintImpl|IntImpl): untyped =
+  # XXX: https://github.com/nim-lang/Nim/issues/9494
+  mixin bitsof
+  bitsof(x.lo) * 2
 
 template applyHiLo*(a: UintImpl | IntImpl, c: untyped): untyped =
   ## Apply `c` to each of `hi` and `lo`

stint/uint_public.nim

@@ -10,7 +10,7 @@
 import ./private/datatypes
 
 export StUint
-export UintImpl, uintImpl # TODO: remove the need to export those
+export UintImpl, uintImpl, bitsof # TODO: remove the need to export those
 
 import ./private/uint_addsub
 

tests/nim.cfg

@@ -0,0 +1,3 @@
+# Ensure code is ready for threads..
+--threads:on
+