a619ec70cf
* Add explicit keyword to conversion constructors, or add NOLINT for implicit converters. Bug: 28341362 Test: build with WITH_TIDY=1 Change-Id: Id8ca42433a4fc3652e4cb13787c4cb169f20d9a9
108 lines
3.5 KiB
C++
108 lines
3.5 KiB
C++
/*
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* Copyright 2015, The Android Open Source Project
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef ANDROID_FAT_VECTOR_H
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#define ANDROID_FAT_VECTOR_H
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#include "utils/Macros.h"
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#include <stddef.h>
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#include <stdlib.h>
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#include <type_traits>
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#include <utils/Log.h>
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#include <vector>
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namespace android {
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namespace uirenderer {
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template <typename T, size_t SIZE>
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class InlineStdAllocator {
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public:
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struct Allocation {
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PREVENT_COPY_AND_ASSIGN(Allocation);
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public:
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Allocation() {};
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// char array instead of T array, so memory is uninitialized, with no destructors run
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char array[sizeof(T) * SIZE];
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bool inUse = false;
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};
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typedef T value_type; // needed to implement std::allocator
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typedef T* pointer; // needed to implement std::allocator
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explicit InlineStdAllocator(Allocation& allocation)
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: mAllocation(allocation) {}
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InlineStdAllocator(const InlineStdAllocator& other)
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: mAllocation(other.mAllocation) {}
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~InlineStdAllocator() {}
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T* allocate(size_t num, const void* = 0) {
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if (!mAllocation.inUse && num <= SIZE) {
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mAllocation.inUse = true;
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return (T*) mAllocation.array;
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} else {
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return (T*) malloc(num * sizeof(T));
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}
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}
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void deallocate(pointer p, size_t num) {
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if (p == (T*)mAllocation.array) {
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mAllocation.inUse = false;
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} else {
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// 'free' instead of delete here - destruction handled separately
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free(p);
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}
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}
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Allocation& mAllocation;
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};
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/**
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* std::vector with SIZE elements preallocated into an internal buffer.
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*
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* Useful for avoiding the cost of malloc in cases where only SIZE or
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* fewer elements are needed in the common case.
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*/
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template <typename T, size_t SIZE>
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class FatVector : public std::vector<T, InlineStdAllocator<T, SIZE>> {
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public:
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FatVector() : std::vector<T, InlineStdAllocator<T, SIZE>>(
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InlineStdAllocator<T, SIZE>(mAllocation)) {
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this->reserve(SIZE);
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}
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explicit FatVector(size_t capacity) : FatVector() {
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this->resize(capacity);
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}
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private:
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typename InlineStdAllocator<T, SIZE>::Allocation mAllocation;
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};
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}; // namespace uirenderer
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}; // namespace android
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#endif // ANDROID_FAT_VECTOR_H
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