reed@android.com | 00bf85a | 2009-01-22 13:04:56 +0000 | [diff] [blame] | 1 | /* |
epoger@google.com | ec3ed6a | 2011-07-28 14:26:00 +0000 | [diff] [blame] | 2 | * Copyright 2009 The Android Open Source Project |
reed@android.com | 00bf85a | 2009-01-22 13:04:56 +0000 | [diff] [blame] | 3 | * |
epoger@google.com | ec3ed6a | 2011-07-28 14:26:00 +0000 | [diff] [blame] | 4 | * Use of this source code is governed by a BSD-style license that can be |
| 5 | * found in the LICENSE file. |
reed@android.com | 00bf85a | 2009-01-22 13:04:56 +0000 | [diff] [blame] | 6 | */ |
| 7 | |
Mike Reed | ab273fa | 2017-01-11 13:58:55 -0500 | [diff] [blame] | 8 | #ifndef sk_tools_Registry_DEFINED |
| 9 | #define sk_tools_Registry_DEFINED |
reed@android.com | 00bf85a | 2009-01-22 13:04:56 +0000 | [diff] [blame] | 10 | |
Ben Wagner | d5148e3 | 2018-07-16 17:44:06 -0400 | [diff] [blame^] | 11 | #include "SkNoncopyable.h" |
reed@android.com | 00bf85a | 2009-01-22 13:04:56 +0000 | [diff] [blame] | 12 | #include "SkTypes.h" |
| 13 | |
Mike Reed | ab273fa | 2017-01-11 13:58:55 -0500 | [diff] [blame] | 14 | namespace sk_tools { |
| 15 | |
reed@android.com | 00bf85a | 2009-01-22 13:04:56 +0000 | [diff] [blame] | 16 | /** Template class that registers itself (in the constructor) into a linked-list |
| 17 | and provides a function-pointer. This can be used to auto-register a set of |
| 18 | services, e.g. a set of image codecs. |
| 19 | */ |
Mike Reed | ab273fa | 2017-01-11 13:58:55 -0500 | [diff] [blame] | 20 | template <typename T> class Registry : SkNoncopyable { |
reed@android.com | 00bf85a | 2009-01-22 13:04:56 +0000 | [diff] [blame] | 21 | public: |
mtklein@google.com | bd6343b | 2013-09-04 17:20:18 +0000 | [diff] [blame] | 22 | typedef T Factory; |
reed@android.com | 00bf85a | 2009-01-22 13:04:56 +0000 | [diff] [blame] | 23 | |
Mike Reed | ab273fa | 2017-01-11 13:58:55 -0500 | [diff] [blame] | 24 | explicit Registry(T fact) : fFact(fact) { |
djsollen@google.com | 56c6977 | 2011-11-08 19:00:26 +0000 | [diff] [blame] | 25 | #ifdef SK_BUILD_FOR_ANDROID |
reed@android.com | 57b799e | 2009-04-01 20:26:42 +0000 | [diff] [blame] | 26 | // work-around for double-initialization bug |
| 27 | { |
Mike Reed | ab273fa | 2017-01-11 13:58:55 -0500 | [diff] [blame] | 28 | Registry* reg = gHead; |
reed@android.com | 57b799e | 2009-04-01 20:26:42 +0000 | [diff] [blame] | 29 | while (reg) { |
| 30 | if (reg == this) { |
| 31 | return; |
| 32 | } |
| 33 | reg = reg->fChain; |
| 34 | } |
| 35 | } |
| 36 | #endif |
reed@android.com | 00bf85a | 2009-01-22 13:04:56 +0000 | [diff] [blame] | 37 | fChain = gHead; |
mtklein@google.com | bd6343b | 2013-09-04 17:20:18 +0000 | [diff] [blame] | 38 | gHead = this; |
reed@android.com | 00bf85a | 2009-01-22 13:04:56 +0000 | [diff] [blame] | 39 | } |
| 40 | |
Mike Reed | ab273fa | 2017-01-11 13:58:55 -0500 | [diff] [blame] | 41 | static const Registry* Head() { return gHead; } |
reed@android.com | 00bf85a | 2009-01-22 13:04:56 +0000 | [diff] [blame] | 42 | |
Mike Reed | ab273fa | 2017-01-11 13:58:55 -0500 | [diff] [blame] | 43 | const Registry* next() const { return fChain; } |
mtklein@google.com | bd6343b | 2013-09-04 17:20:18 +0000 | [diff] [blame] | 44 | const Factory& factory() const { return fFact; } |
reed@android.com | 00bf85a | 2009-01-22 13:04:56 +0000 | [diff] [blame] | 45 | |
| 46 | private: |
Mike Reed | ab273fa | 2017-01-11 13:58:55 -0500 | [diff] [blame] | 47 | Factory fFact; |
| 48 | Registry* fChain; |
reed@android.com | 00bf85a | 2009-01-22 13:04:56 +0000 | [diff] [blame] | 49 | |
Mike Reed | ab273fa | 2017-01-11 13:58:55 -0500 | [diff] [blame] | 50 | static Registry* gHead; |
reed@android.com | 00bf85a | 2009-01-22 13:04:56 +0000 | [diff] [blame] | 51 | }; |
| 52 | |
reed@android.com | f523e25 | 2009-01-26 23:15:37 +0000 | [diff] [blame] | 53 | // The caller still needs to declare an instance of this somewhere |
Mike Reed | ab273fa | 2017-01-11 13:58:55 -0500 | [diff] [blame] | 54 | template <typename T> Registry<T>* Registry<T>::gHead; |
| 55 | |
| 56 | } // namespace sk_tools |
reed@android.com | 00bf85a | 2009-01-22 13:04:56 +0000 | [diff] [blame] | 57 | |
| 58 | #endif |