Removed funky Maybe constructor and made fields private.

include/v8.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /** \mainpage V8 API Reference Guide
  *
  * V8 is Google's open source JavaScript engine.
  *
  * This set of documents provides reference material generated from the
  * V8 header file, include/v8.h.
@@ skipping 5708 matching lines @@
   friend class Maybe;
   template <class T> friend class Eternal;
   template <class T> friend class PersistentBase;
   template <class T, class M> friend class Persistent;
   friend class Context;
 };
 
 
 /**
  * A simple Maybe type, representing an object which may or may not have a
- * value.
+ * value, see https://hackage.haskell.org/package/base/docs/Data-Maybe.html.
  */
 template <class T>
 class Maybe {
  public:
-  // TODO(dcarney): remove this constructor, it makes no sense.
-  Maybe(bool has, const T& t) : has_value(has), value(t) {}
-
   V8_INLINE bool IsJust() const { return has_value; }
 
   V8_INLINE T FromJust() const {
 #ifdef V8_ENABLE_CHECKS
     V8::CheckIsJust(IsJust());
 #endif
     return value;
   }
 
   V8_INLINE T FromMaybe(const T& default_value) const {
     return has_value ? value : default_value;
   }
 
-  // TODO(dcarney): make private.
+  V8_INLINE bool operator==(const Maybe& other) const {
+    return (IsJust() == other.IsJust()) &&
+           (!IsJust() || FromJust() == other.FromJust());
+  }
+
+  V8_INLINE bool operator!=(const Maybe& other) const {
+    return !operator==(other);
+  }
+
+ private:
+  Maybe() : has_value(false) {}
+  explicit Maybe(const T& t) : has_value(true), value(t) {}
+
   bool has_value;
   T value;
 
- private:
   template <class U>
   friend Maybe<U> Nothing();
   template <class U>
   friend Maybe<U> Just(const U& u);
-
-  Maybe() : has_value(false) {}
-  explicit Maybe(const T& t) : has_value(true), value(t) {}
 };
 
 
 template <class T>
 inline Maybe<T> Nothing() {
   return Maybe<T>();
 }
 
 
 template <class T>
@@ skipping 1874 matching lines @@
  */
 
 
 }  // namespace v8
 
 
 #undef TYPE_CHECK
 
 
 #endif  // V8_H_