comparison osx/include/kj/one-of.h @ 62:0994c39f1e94

Cap'n Proto v0.6 + build for OSX

     KJ_IREQUIRE(is<T>(), "Must check OneOf::is<T>() before calling get<T>().");
     return *reinterpret_cast<const T*>(space);
   }
 
   template <typename T, typename... Params>
-  void init(Params&&... params) {
+  T& init(Params&&... params) {
     if (tag != 0) destroy();
     ctor(*reinterpret_cast<T*>(space), kj::fwd<Params>(params)...);
     tag = typeIndex<T>();
+    return *reinterpret_cast<T*>(space);
   }
 
 private:
   uint tag;
 

   }
   // Returns the maximum of all the parameters.
   // TODO(someday):  Generalize the above template and make it common.  I tried, but C++ decided to
   //   be difficult so I cut my losses.
 
+  static constexpr auto spaceSize = maxSize(sizeof(Variants)...);
+  // TODO(msvc):  This constant could just as well go directly inside space's bracket's, where it's
+  // used, but MSVC suffers a parse error on `...`.
+
   union {
-    byte space[maxSize(sizeof(Variants)...)];
+    byte space[spaceSize];
 
     void* forceAligned;
     // TODO(someday):  Use C++11 alignas() once we require GCC 4.8 / Clang 3.3.
   };