Const Correctness for String::Value

Patch by Patrick Gansterer <paroga@paroga.com>.
Review at http://codereview.chromium.org/199043.


git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@2831 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

AUTHORS

@@ -17,3 +17,4 @@ Paolo Giarrusso <p.giarrusso@gmail.com>
 Rafal Krypa <rafal@krypa.net>
 Rene Rebe <rene@exactcode.de>
 Ryan Dahl <coldredlemur@gmail.com>
+Patrick Gansterer <paroga@paroga.com>

include/v8.h

@@ -979,8 +979,9 @@ class V8EXPORT String : public Primitive {
    public:
     explicit Utf8Value(Handle<v8::Value> obj);
     ~Utf8Value();
-    char* operator*() const { return str_; }
-    int length() { return length_; }
+    char* operator*() { return str_; }
+    const char* operator*() const { return str_; }
+    int length() const { return length_; }
    private:
     char* str_;
     int length_;
@@ -1001,8 +1002,9 @@ class V8EXPORT String : public Primitive {
    public:
     explicit AsciiValue(Handle<v8::Value> obj);
     ~AsciiValue();
-    char* operator*() const { return str_; }
-    int length() { return length_; }
+    char* operator*() { return str_; }
+    const char* operator*() const { return str_; }
+    int length() const { return length_; }
    private:
     char* str_;
     int length_;
@@ -1023,7 +1025,8 @@ class V8EXPORT String : public Primitive {
     explicit Value(Handle<v8::Value> obj);
     ~Value();
     uint16_t* operator*() const { return str_; }
-    int length() { return length_; }
+    const uint16_t* operator*() { return str_; }
+    int length() const { return length_; }
    private:
     uint16_t* str_;
     int length_;