12bc53e031
-- c99f979ad34f155fbeeea69b88bdc7458d89a21c by Derek Mauro <dmauro@google.com>: Remove a floating point division by zero test. This isn't testing behavior related to the library, and MSVC warns about it in opt mode. PiperOrigin-RevId: 285220804 -- 68b015491f0dbf1ab547994673281abd1f34cd4b by Gennadiy Rozental <rogeeff@google.com>: This CL introduces following changes to the class FlagImpl: * We eliminate the CommandLineFlagLocks struct. Instead callback guard and callback function are combined into a single CallbackData struct, while primary data lock is stored separately. * CallbackData member of class FlagImpl is initially set to be nullptr and is only allocated and initialized when a flag's callback is being set. For most flags we do not pay for the extra space and extra absl::Mutex now. * Primary data guard is stored in data_guard_ data member. This is a properly aligned character buffer of necessary size. During initialization of the flag we construct absl::Mutex in this space using placement new call. * We now avoid extra value copy after successful attempt to parse value out of string. Instead we swap flag's current value with tentative value we just produced. PiperOrigin-RevId: 285132636 -- ed45d118fb818969eb13094cf7827c885dfc562c by Tom Manshreck <shreck@google.com>: Change null-term* (and nul-term*) to NUL-term* in comments PiperOrigin-RevId: 285036610 -- 729619017944db895ce8d6d29c1995aa2e5628a5 by Derek Mauro <dmauro@google.com>: Use the Posix implementation of thread identity on MinGW. Some versions of MinGW suffer from thread_local bugs. PiperOrigin-RevId: 285022920 -- 39a25493503c76885bc3254c28f66a251c5b5bb0 by Greg Falcon <gfalcon@google.com>: Implementation detail change. Add further ABSL_NAMESPACE_BEGIN and _END annotation macros to files in Abseil. PiperOrigin-RevId: 285012012 GitOrigin-RevId: c99f979ad34f155fbeeea69b88bdc7458d89a21c Change-Id: I4c85d3704e45d11a9ac50d562f39640a6adbedc1
83 lines
2.5 KiB
C++
83 lines
2.5 KiB
C++
// 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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