SkPDF: SkPDFGraphicState Lookup hashtabled

src/core/SkTHash.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkTHash_DEFINED
 #define SkTHash_DEFINED
 
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     // Copy an item into the set.
     void add(const T& item) { fTable.set(item); }
 
     // Is this item in the set?
     bool contains(const T& item) const { return SkToBool(this->find(item)); }
 
     // If an item equal to this is in the set, return a pointer to it, otherwise null.
     // This pointer remains valid until the next call to add().
     const T* find(const T& item) const { return fTable.find(item); }
 
+    // Call fn on every item in the set.  You may not mutate anything.
+    template <typename Fn>  // f(T), f(const T&)
+    void foreach (Fn&& fn) const {
+        fTable.foreach (fn);
+    }
+
 private:
     struct Traits {
         static const T& GetKey(const T& item) { return item; }
         static uint32_t Hash(const T& item) { return HashT(item); }
     };
     SkTHashTable<T, T, Traits> fTable;
 };
 
 #endif//SkTHash_DEFINED