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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 sk_tools_Registry_DEFINED
#define sk_tools_Registry_DEFINED
#include "SkTypes.h"
namespace sk_tools {
/** 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 Registry : SkNoncopyable {
typedef T Factory;
explicit Registry(T fact) : fFact(fact) {
// work-around for double-initialization bug
Registry* reg = gHead;
while (reg) {
if (reg == this) {
reg = reg->fChain;
fChain = gHead;
gHead = this;
static const Registry* Head() { return gHead; }
const Registry* next() const { return fChain; }
const Factory& factory() const { return fFact; }
Factory fFact;
Registry* fChain;
static Registry* gHead;
// The caller still needs to declare an instance of this somewhere
template <typename T> Registry<T>* Registry<T>::gHead;
} // namespace sk_tools