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| 1 /* |
| 2 * Copyright 2016 Google Inc. |
| 3 * |
| 4 * Use of this source code is governed by a BSD-style license that can be |
| 5 * found in the LICENSE file. |
| 6 */ |
| 7 |
| 8 #ifndef GrResourceHandle_DEFINED |
| 9 #define GrResourceHandle_DEFINED |
| 10 |
| 11 #include "SkTypes.h" |
| 12 |
| 13 // Opaque handle to a resource. Users should always use the macro below to creat
e a specific |
| 14 // template instantiation of GrResourceHandle. |
| 15 template <typename kind> class GrResourceHandle { |
| 16 public: |
| 17 GrResourceHandle(int value) : fValue(value) { |
| 18 SkASSERT(this->isValid()); |
| 19 } |
| 20 |
| 21 GrResourceHandle() : fValue(kInvalid_ResourceHandle) {} |
| 22 |
| 23 bool operator==(const GrResourceHandle& other) const { return other.fValue =
= fValue; } |
| 24 bool isValid() const { return kInvalid_ResourceHandle != fValue; } |
| 25 int toIndex() const { SkASSERT(this->isValid()); return fValue; } |
| 26 |
| 27 private: |
| 28 static const int kInvalid_ResourceHandle = -1; |
| 29 int fValue; |
| 30 }; |
| 31 |
| 32 // Creates a type "name", which is a specfic template instantiation of GrResourc
eHandle. |
| 33 #define GR_DEFINE_RESOURCE_HANDLE_CLASS(name) \ |
| 34 struct name##Kind {}; \ |
| 35 using name = GrResourceHandle<name##Kind>; |
| 36 #endif |
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