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 "include/core/SkTypes.h" 12 13// Opaque handle to a resource. Users should always use the macro below to create a specific 14// template instantiation of GrResourceHandle. 15template <typename kind> class GrResourceHandle { 16public: 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 27private: 28 static const int kInvalid_ResourceHandle = -1; 29 int fValue; 30}; 31 32// Creates a type "name", which is a specfic template instantiation of GrResourceHandle. 33#define GR_DEFINE_RESOURCE_HANDLE_CLASS(name) \ 34 struct name##Kind {}; \ 35 using name = GrResourceHandle<name##Kind>; 36#endif 37