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author | Matt A. Tobin <mattatobin@localhost.localdomain> | 2018-02-02 04:16:08 -0500 |
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committer | Matt A. Tobin <mattatobin@localhost.localdomain> | 2018-02-02 04:16:08 -0500 |
commit | 5f8de423f190bbb79a62f804151bc24824fa32d8 (patch) | |
tree | 10027f336435511475e392454359edea8e25895d /netwerk/sctp/src/LocalArray.h | |
parent | 49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff) | |
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Add m-esr52 at 52.6.0
Diffstat (limited to 'netwerk/sctp/src/LocalArray.h')
-rw-r--r-- | netwerk/sctp/src/LocalArray.h | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/netwerk/sctp/src/LocalArray.h b/netwerk/sctp/src/LocalArray.h new file mode 100644 index 000000000..2ab708aff --- /dev/null +++ b/netwerk/sctp/src/LocalArray.h @@ -0,0 +1,75 @@ +/* + * Copyright (C) 2009 The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#ifndef LOCAL_ARRAY_H_included +#define LOCAL_ARRAY_H_included + +#include <cstddef> +#include <new> + +/** + * A fixed-size array with a size hint. That number of bytes will be allocated + * on the stack, and used if possible, but if more bytes are requested at + * construction time, a buffer will be allocated on the heap (and deallocated + * by the destructor). + * + * The API is intended to be a compatible subset of C++0x's std::array. + */ +template <size_t STACK_BYTE_COUNT> +class LocalArray { +public: + /** + * Allocates a new fixed-size array of the given size. If this size is + * less than or equal to the template parameter STACK_BYTE_COUNT, an + * internal on-stack buffer will be used. Otherwise a heap buffer will + * be allocated. + */ + LocalArray(size_t desiredByteCount) : mSize(desiredByteCount) { + if (desiredByteCount > STACK_BYTE_COUNT) { + mPtr = new char[mSize]; + } else { + mPtr = &mOnStackBuffer[0]; + } + } + + /** + * Frees the heap-allocated buffer, if there was one. + */ + ~LocalArray() { + if (mPtr != &mOnStackBuffer[0]) { + delete[] mPtr; + } + } + + // Capacity. + size_t size() { return mSize; } + bool empty() { return mSize == 0; } + + // Element access. + char& operator[](size_t n) { return mPtr[n]; } + const char& operator[](size_t n) const { return mPtr[n]; } + +private: + char mOnStackBuffer[STACK_BYTE_COUNT]; + char* mPtr; + size_t mSize; + + // Disallow copy and assignment. + LocalArray(const LocalArray&); + void operator=(const LocalArray&); +}; + +#endif // LOCAL_ARRAY_H_included |