ab273facbf
BUG=skia: Change-Id: Ie7d4fac3024b361a281f456fec2b3a837e2bfe43 Reviewed-on: https://skia-review.googlesource.com/6881 Commit-Queue: Mike Reed <reed@google.com> Reviewed-by: Mike Klein <mtklein@chromium.org>
58 lines
1.3 KiB
C++
58 lines
1.3 KiB
C++
/*
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* Copyright 2009 The Android Open Source Project
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef sk_tools_Registry_DEFINED
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#define sk_tools_Registry_DEFINED
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#include "SkTypes.h"
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namespace sk_tools {
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/** Template class that registers itself (in the constructor) into a linked-list
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and provides a function-pointer. This can be used to auto-register a set of
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services, e.g. a set of image codecs.
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*/
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template <typename T> class Registry : SkNoncopyable {
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public:
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typedef T Factory;
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explicit Registry(T fact) : fFact(fact) {
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#ifdef SK_BUILD_FOR_ANDROID
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// work-around for double-initialization bug
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{
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Registry* reg = gHead;
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while (reg) {
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if (reg == this) {
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return;
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}
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reg = reg->fChain;
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}
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}
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#endif
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fChain = gHead;
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gHead = this;
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}
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static const Registry* Head() { return gHead; }
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const Registry* next() const { return fChain; }
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const Factory& factory() const { return fFact; }
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private:
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Factory fFact;
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Registry* fChain;
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static Registry* gHead;
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};
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// The caller still needs to declare an instance of this somewhere
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template <typename T> Registry<T>* Registry<T>::gHead;
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} // namespace sk_tools
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#endif
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