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