Abseil Common Libraries (C++) (grcp 依赖)
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80 lines
2.4 KiB
80 lines
2.4 KiB
6 years ago
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// Copyright 2018 The Abseil Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef ABSL_CONTAINER_INTERNAL_COUNTING_ALLOCATOR_H_
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#define ABSL_CONTAINER_INTERNAL_COUNTING_ALLOCATOR_H_
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#include <cassert>
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#include <cstdint>
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#include <memory>
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namespace absl {
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namespace container_internal {
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// This is a stateful allocator, but the state lives outside of the
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// allocator (in whatever test is using the allocator). This is odd
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// but helps in tests where the allocator is propagated into nested
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// containers - that chain of allocators uses the same state and is
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// thus easier to query for aggregate allocation information.
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template <typename T>
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class CountingAllocator : public std::allocator<T> {
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public:
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using Alloc = std::allocator<T>;
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using pointer = typename Alloc::pointer;
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using size_type = typename Alloc::size_type;
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CountingAllocator() : bytes_used_(nullptr) {}
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explicit CountingAllocator(int64_t* b) : bytes_used_(b) {}
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template <typename U>
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CountingAllocator(const CountingAllocator<U>& x)
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: Alloc(x), bytes_used_(x.bytes_used_) {}
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pointer allocate(size_type n,
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std::allocator<void>::const_pointer hint = nullptr) {
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assert(bytes_used_ != nullptr);
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*bytes_used_ += n * sizeof(T);
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return Alloc::allocate(n, hint);
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}
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void deallocate(pointer p, size_type n) {
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Alloc::deallocate(p, n);
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assert(bytes_used_ != nullptr);
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*bytes_used_ -= n * sizeof(T);
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}
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template<typename U>
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class rebind {
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public:
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using other = CountingAllocator<U>;
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};
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friend bool operator==(const CountingAllocator& a,
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const CountingAllocator& b) {
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return a.bytes_used_ == b.bytes_used_;
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}
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friend bool operator!=(const CountingAllocator& a,
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const CountingAllocator& b) {
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return !(a == b);
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}
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int64_t* bytes_used_;
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};
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} // namespace container_internal
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} // namespace absl
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#endif // ABSL_CONTAINER_INTERNAL_COUNTING_ALLOCATOR_H_
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