1 2/* 3 * Copyright 2009 The Android Open Source Project 4 * 5 * Use of this source code is governed by a BSD-style license that can be 6 * found in the LICENSE file. 7 */ 8 9 10#ifndef SkTRegistry_DEFINED 11#define SkTRegistry_DEFINED 12 13#include "SkTypes.h" 14 15/** Template class that registers itself (in the constructor) into a linked-list 16 and provides a function-pointer. This can be used to auto-register a set of 17 services, e.g. a set of image codecs. 18 */ 19template <typename T, typename P> class SkTRegistry : SkNoncopyable { 20public: 21 typedef T (*Factory)(P); 22 23 SkTRegistry(Factory fact) { 24#ifdef SK_BUILD_FOR_ANDROID 25 // work-around for double-initialization bug 26 { 27 SkTRegistry* reg = gHead; 28 while (reg) { 29 if (reg == this) { 30 return; 31 } 32 reg = reg->fChain; 33 } 34 } 35#endif 36 fFact = fact; 37 fChain = gHead; 38 gHead = this; 39 } 40 41 static const SkTRegistry* Head() { return gHead; } 42 43 const SkTRegistry* next() const { return fChain; } 44 Factory factory() const { return fFact; } 45 46private: 47 Factory fFact; 48 SkTRegistry* fChain; 49 50 static SkTRegistry* gHead; 51}; 52 53// The caller still needs to declare an instance of this somewhere 54template <typename T, typename P> SkTRegistry<T, P>* SkTRegistry<T, P>::gHead; 55 56#endif 57