d5148e3314
Change-Id: I62f60ea52faeebddecacf03d9429ac3f7c516b8e Reviewed-on: https://skia-review.googlesource.com/141823 Commit-Queue: Ben Wagner <bungeman@google.com> Reviewed-by: Ben Wagner <bungeman@google.com>
59 lines
1.4 KiB
C++
59 lines
1.4 KiB
C++
/*
|
|
* 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 "SkNoncopyable.h"
|
|
#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 {
|
|
public:
|
|
typedef T Factory;
|
|
|
|
explicit Registry(T fact) : fFact(fact) {
|
|
#ifdef SK_BUILD_FOR_ANDROID
|
|
// work-around for double-initialization bug
|
|
{
|
|
Registry* reg = gHead;
|
|
while (reg) {
|
|
if (reg == this) {
|
|
return;
|
|
}
|
|
reg = reg->fChain;
|
|
}
|
|
}
|
|
#endif
|
|
fChain = gHead;
|
|
gHead = this;
|
|
}
|
|
|
|
static const Registry* Head() { return gHead; }
|
|
|
|
const Registry* next() const { return fChain; }
|
|
const Factory& factory() const { return fFact; }
|
|
|
|
private:
|
|
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
|
|
|
|
#endif
|