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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef HEAPCOPYOFSTACKARRAY_H_
#define HEAPCOPYOFSTACKARRAY_H_
#include "mozilla/Attributes.h"
#include "mozilla/UniquePtr.h"
#include <string.h>
namespace mozilla {
// Takes a stack array and copies it into a heap buffer.
// Useful to retain the convenience of declaring static arrays, while
// avoiding passing stack pointers to the GL (see bug 1005658).
template <typename ElemType>
class HeapCopyOfStackArray
{
public:
template<size_t N>
MOZ_IMPLICIT HeapCopyOfStackArray(ElemType (&array)[N])
: mArrayLength(N)
, mArrayData(MakeUnique<ElemType[]>(N))
{
memcpy(mArrayData.get(), &array[0], N * sizeof(ElemType));
}
ElemType* Data() const { return mArrayData.get(); }
size_t ArrayLength() const { return mArrayLength; }
size_t ByteLength() const { return mArrayLength * sizeof(ElemType); }
private:
HeapCopyOfStackArray() = delete;
HeapCopyOfStackArray(const HeapCopyOfStackArray&) = delete;
const size_t mArrayLength;
UniquePtr<ElemType[]> const mArrayData;
};
} // namespace mozilla
#endif // HEAPCOPYOFSTACKARRAY_H_
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