Make SkTDArray accessors const-friendly

include/core/SkTDArray.h

 
 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef SkTDArray_DEFINED
@@ skipping 84 matching lines @@
     /**
      *  Return the number of elements in the array
      */
     int count() const { return (int)fCount; }
 
     /**
      *  return the number of bytes in the array: count * sizeof(T)
      */
     size_t bytes() const { return fCount * sizeof(T); }
 
-    T*  begin() const { return fArray; }
-    T*  end() const { return fArray ? fArray + fCount : NULL; }
-    T&  operator[](int index) const {
+    T*  begin() { return fArray; }
+    const T*  begin() const { return fArray; }
+    T*  end() { return fArray ? fArray + fCount : NULL; }
+    const T*  end() const { return fArray ? fArray + fCount : NULL; }
+
+    T&  operator[](int index) {
+        SkASSERT((unsigned)index < fCount);
+        return fArray[index];
+    }
+    const T&  operator[](int index) const {
         SkASSERT((unsigned)index < fCount);
         return fArray[index];
     }
 
-    T&  getAt(int index) const {
+    T&  getAt(int index)  {
+        return (*this)[index];
+    }
+    const T&  getAt(int index) const {
         return (*this)[index];
     }
 
     void reset() {
         if (fArray) {
             sk_free(fArray);
             fArray = NULL;
 #ifdef SK_DEBUG
             fData = NULL;
 #endif
@@ skipping 176 matching lines @@
     void safeUnrefAll() {
         T*  iter = fArray;
         T*  stop = fArray + fCount;
         while (iter < stop) {
             SkSafeUnref(*iter);
             iter += 1;
         }
         this->reset();
     }
 
-    void visitAll(void visitor(T&)) const {
+    void visitAll(void visitor(T&)) {
         T* stop = this->end();
         for (T* curr = this->begin(); curr < stop; curr++) {
             if (*curr) {
                 visitor(*curr);
             }
         }
     }
 
 #ifdef SK_DEBUG
     void validate() const {
@@ skipping 26 matching lines @@
 #ifdef SK_DEBUG
             fData = (ArrayT*)fArray;
 #endif
             fReserve = size;
         }
         fCount += extra;
     }
 };
 
 #endif