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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
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Add m-esr52 at 52.6.0
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+/*
+ * 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