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