Fix invalid type in Pointer

Fixed https://github.com/miloyip/rapidjson-gitbook/issues/1

include/rapidjson/pointer.h

@@ -537,14 +537,14 @@ public:
     */
     ValueType& GetWithDefault(ValueType& root, const ValueType& defaultValue, typename ValueType::AllocatorType& allocator) const {
         bool alreadyExist;
-        Value& v = Create(root, allocator, &alreadyExist);
+        ValueType& v = Create(root, allocator, &alreadyExist);
         return alreadyExist ? v : v.CopyFrom(defaultValue, allocator);
     }
 
     //! Query a value in a subtree with default null-terminated string.
     ValueType& GetWithDefault(ValueType& root, const Ch* defaultValue, typename ValueType::AllocatorType& allocator) const {
         bool alreadyExist;
-        Value& v = Create(root, allocator, &alreadyExist);
+        ValueType& v = Create(root, allocator, &alreadyExist);
         return alreadyExist ? v : v.SetString(defaultValue, allocator);
     }
 
@@ -552,7 +552,7 @@ public:
     //! Query a value in a subtree with default std::basic_string.
     ValueType& GetWithDefault(ValueType& root, const std::basic_string<Ch>& defaultValue, typename ValueType::AllocatorType& allocator) const {
         bool alreadyExist;
-        Value& v = Create(root, allocator, &alreadyExist);
+        ValueType& v = Create(root, allocator, &alreadyExist);
         return alreadyExist ? v : v.SetString(defaultValue, allocator);
     }
 #endif