Line data    Source code

       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 create a specific
      14             : // template instantiation of GrResourceHandle.
      15             : template <typename kind> class GrResourceHandle {
      16             : public:
      17           0 :     GrResourceHandle(int value) : fValue(value) {
      18           0 :         SkASSERT(this->isValid());
      19           0 :     }
      20             : 
      21           0 :     GrResourceHandle() : fValue(kInvalid_ResourceHandle) {}
      22             : 
      23             :     bool operator==(const GrResourceHandle& other) const { return other.fValue == fValue; }
      24           0 :     bool isValid() const { return kInvalid_ResourceHandle != fValue; }
      25           0 :     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 GrResourceHandle.
      33             : #define GR_DEFINE_RESOURCE_HANDLE_CLASS(name) \
      34             :     struct name##Kind {};  \
      35             :     using name = GrResourceHandle<name##Kind>;
      36             : #endif