Merge pull request #1639 from WalterBright/rm-PostBlitType

refactor: eliminate unnecessary _PostBlitType template

src/object.d

@@ -3380,28 +3380,27 @@ private U[] _dup(T, U)(scope T[] a) // pure nothrow depends on postblit
 private extern (C) void[] _d_newarrayU(const TypeInfo ti, size_t length) pure nothrow;
 
 
-private template _PostBlitType(T)
-{
-    // assume that ref T and void* are equivalent in abi level.
-    static if (is(T == struct))
-        alias _PostBlitType = typeof(function (ref T t){ T a = t; });
-    else
-        alias _PostBlitType = typeof(delegate (ref T t){ T a = t; });
-}
-
-// Returns null, or a delegate to call postblit of T
+/**************
+ * Get the postblit for type T.
+ * Returns:
+ *      null if no postblit is necessary
+ *      function pointer for struct postblits
+ *      delegate for class postblits
+ */
 private auto _getPostblit(T)() @trusted pure nothrow @nogc
 {
     // infer static postblit type, run postblit if any
     static if (is(T == struct))
     {
         import core.internal.traits : Unqual;
         // use typeid(Unqual!T) here to skip TypeInfo_Const/Shared/...
-        return cast(_PostBlitType!T)typeid(Unqual!T).xpostblit;
+        alias _PostBlitType = typeof(function (ref T t){ T a = t; });
+        return cast(_PostBlitType)typeid(Unqual!T).xpostblit;
     }
     else if ((&typeid(T).postblit).funcptr !is &TypeInfo.postblit)
     {
-        return cast(_PostBlitType!T)&typeid(T).postblit;
+        alias _PostBlitType = typeof(delegate (ref T t){ T a = t; });
+        return cast(_PostBlitType)&typeid(T).postblit;
     }
     else
         return null;