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* Copyright 2009 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 SkTRegistry_DEFINED
#define SkTRegistry_DEFINED
#include "SkTypes.h"
/** Template class that registers itself (in the constructor) into a linked-list
and provides a function-pointer. This can be used to auto-register a set of
services, e.g. a set of image codecs.
template <typename T> class SkTRegistry : SkNoncopyable {
typedef T Factory;
explicit SkTRegistry(T fact) : fFact(fact) {
// work-around for double-initialization bug
SkTRegistry* reg = gHead;
while (reg) {
if (reg == this) {
reg = reg->fChain;
fChain = gHead;
gHead = this;
static const SkTRegistry* Head() { return gHead; }
const SkTRegistry* next() const { return fChain; }
const Factory& factory() const { return fFact; }
Factory fFact;
SkTRegistry* fChain;
static SkTRegistry* gHead;
// The caller still needs to declare an instance of this somewhere
template <typename T> SkTRegistry<T>* SkTRegistry<T>::gHead;