52 lines
1.5 KiB
C++
52 lines
1.5 KiB
C++
/*
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* Copyright 2009, The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef SkTRegistry_DEFINED
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#define SkTRegistry_DEFINED
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#include "SkTypes.h"
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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, typename P> class SkTRegistry : SkNoncopyable {
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public:
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typedef T (*Factory)(P);
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SkTRegistry(Factory fact) {
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fFact = fact;
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fChain = gHead;
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gHead = this;
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}
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static const SkTRegistry* Head() { return gHead; }
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const SkTRegistry* next() const { return fChain; }
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Factory factory() const { return fFact; }
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private:
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Factory fFact;
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SkTRegistry* fChain;
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static SkTRegistry* 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, typename P> SkTRegistry<T, P>* SkTRegistry<T, P>::gHead;
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#endif
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