Convert double interface into abstract class

runtime/vm/object.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_OBJECT_H_
 #define VM_OBJECT_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
@@ skipping 853 matching lines @@
     return HasResolvedTypeClass() &&
         Class::Handle(type_class()).IsObjectClass();
   }
 
   // Check if this type represents the 'bool' type.
   bool IsBoolType() const;
 
   // Check if this type represents the 'int' interface.
   bool IsIntInterface() const;
 
-  // Check if this type represents the 'double' interface.
-  bool IsDoubleInterface() const;
+  // Check if this type represents the 'double' type.
+  bool IsDoubleType() const;
 
   // Check if this type represents the 'num' type.
   bool IsNumberType() const;
 
   // Check if this type represents the 'String' interface.
   bool IsStringInterface() const;
 
   // Check if this type represents the 'Function' type.
   bool IsFunctionType() const;
 
@@ skipping 102 matching lines @@
 
   // The 'int' interface type.
   static RawType* IntInterface();
 
   // The 'Smi' type.
   static RawType* SmiType();
 
   // The 'Mint' type.
   static RawType* MintType();
 
-  // The 'double' interface type.
-  static RawType* DoubleInterface();
+  // The 'double' type.
+  static RawType* Double();
 
   // The 'num' interface type.
   static RawType* Number();
 
   // The 'String' interface type.
   static RawType* StringInterface();
 
   // The 'Function' interface type.
   static RawType* Function();
 
@@ skipping 2344 matching lines @@
   }
 
   static RawBigint* Allocate(intptr_t length, Heap::Space space = Heap::kNew);
 
   HEAP_OBJECT_IMPLEMENTATION(Bigint, Integer);
   friend class BigintOperations;
   friend class Class;
 };
 
 
+// Class Double represents class Double in corelib_impl, which implements
+// abstract class double in corelib.
 class Double : public Number {
  public:
   double value() const {
     return raw_ptr()->value_;
   }
 
   bool EqualsToDouble(double value) const;
   virtual bool Equals(const Instance& other) const;
 
   static RawDouble* New(double d, Heap::Space space = Heap::kNew);
@@ skipping 2171 matching lines @@
     if (this->CharAt(i) != str.CharAt(begin_index + i)) {
       return false;
     }
   }
   return true;
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_