1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/netwerk/sctp/src/LocalArray.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,75 @@
1.4 +/*
1.5 + * Copyright (C) 2009 The Android Open Source Project
1.6 + *
1.7 + * Licensed under the Apache License, Version 2.0 (the "License");
1.8 + * you may not use this file except in compliance with the License.
1.9 + * You may obtain a copy of the License at
1.10 + *
1.11 + * http://www.apache.org/licenses/LICENSE-2.0
1.12 + *
1.13 + * Unless required by applicable law or agreed to in writing, software
1.14 + * distributed under the License is distributed on an "AS IS" BASIS,
1.15 + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
1.16 + * See the License for the specific language governing permissions and
1.17 + * limitations under the License.
1.18 + */
1.19 +
1.20 +#ifndef LOCAL_ARRAY_H_included
1.21 +#define LOCAL_ARRAY_H_included
1.22 +
1.23 +#include <cstddef>
1.24 +#include <new>
1.25 +
1.26 +/**
1.27 + * A fixed-size array with a size hint. That number of bytes will be allocated
1.28 + * on the stack, and used if possible, but if more bytes are requested at
1.29 + * construction time, a buffer will be allocated on the heap (and deallocated
1.30 + * by the destructor).
1.31 + *
1.32 + * The API is intended to be a compatible subset of C++0x's std::array.
1.33 + */
1.34 +template <size_t STACK_BYTE_COUNT>
1.35 +class LocalArray {
1.36 +public:
1.37 + /**
1.38 + * Allocates a new fixed-size array of the given size. If this size is
1.39 + * less than or equal to the template parameter STACK_BYTE_COUNT, an
1.40 + * internal on-stack buffer will be used. Otherwise a heap buffer will
1.41 + * be allocated.
1.42 + */
1.43 + LocalArray(size_t desiredByteCount) : mSize(desiredByteCount) {
1.44 + if (desiredByteCount > STACK_BYTE_COUNT) {
1.45 + mPtr = new char[mSize];
1.46 + } else {
1.47 + mPtr = &mOnStackBuffer[0];
1.48 + }
1.49 + }
1.50 +
1.51 + /**
1.52 + * Frees the heap-allocated buffer, if there was one.
1.53 + */
1.54 + ~LocalArray() {
1.55 + if (mPtr != &mOnStackBuffer[0]) {
1.56 + delete[] mPtr;
1.57 + }
1.58 + }
1.59 +
1.60 + // Capacity.
1.61 + size_t size() { return mSize; }
1.62 + bool empty() { return mSize == 0; }
1.63 +
1.64 + // Element access.
1.65 + char& operator[](size_t n) { return mPtr[n]; }
1.66 + const char& operator[](size_t n) const { return mPtr[n]; }
1.67 +
1.68 +private:
1.69 + char mOnStackBuffer[STACK_BYTE_COUNT];
1.70 + char* mPtr;
1.71 + size_t mSize;
1.72 +
1.73 + // Disallow copy and assignment.
1.74 + LocalArray(const LocalArray&);
1.75 + void operator=(const LocalArray&);
1.76 +};
1.77 +
1.78 +#endif // LOCAL_ARRAY_H_included
