Abseil Common Libraries (C++) (grcp 依赖)
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83 lines
2.5 KiB
83 lines
2.5 KiB
// 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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// https://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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#include "absl/base/config.h" |
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namespace absl { |
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ABSL_NAMESPACE_BEGIN |
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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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ABSL_NAMESPACE_END |
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} // namespace absl |
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#endif // ABSL_CONTAINER_INTERNAL_COUNTING_ALLOCATOR_H_
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