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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef PPAPI_SHARED_IMPL_ID_ASSIGNMENT_H_
#define PPAPI_SHARED_IMPL_ID_ASSIGNMENT_H_
#include <limits>
#include "base/basictypes.h"
#include "ppapi/shared_impl/ppapi_shared_export.h"
namespace ppapi {
enum PPIdType {
PP_ID_TYPE_MODULE,
PP_ID_TYPE_INSTANCE,
PP_ID_TYPE_RESOURCE,
PP_ID_TYPE_VAR,
// Not a real type, must be last.
PP_ID_TYPE_COUNT
};
PPAPI_SHARED_EXPORT extern const unsigned int kPPIdTypeBits;
extern const int32 kMaxPPId;
// The most significant bits are the type, the rest are the value.
template <typename T> inline T MakeTypedId(T value, PPIdType type) {
return (value << kPPIdTypeBits) | static_cast<T>(type);
}
template <typename T> inline bool CheckIdType(T id, PPIdType type) {
// Say a resource of 0 is always valid, since that means "no resource."
// You shouldn't be passing 0 var, instance, or module IDs around so those
// are still invalid.
if (type == PP_ID_TYPE_RESOURCE && !id)
return true;
const T mask = (static_cast<T>(1) << kPPIdTypeBits) - 1;
return (id & mask) == type;
}
} // namespace ppapi
#endif // PPAPI_SHARED_IMPL_ID_ASSIGNMENT_H_
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