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
85 lines
2.9 KiB
C++
85 lines
2.9 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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//
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// Provides the internal API for hashtable_debug.h.
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#ifndef ABSL_CONTAINER_INTERNAL_HASHTABLE_DEBUG_HOOKS_H_
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#define ABSL_CONTAINER_INTERNAL_HASHTABLE_DEBUG_HOOKS_H_
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#include <cstddef>
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#include <algorithm>
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#include <type_traits>
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#include <vector>
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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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namespace hashtable_debug_internal {
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// If it is a map, call get<0>().
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using std::get;
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template <typename T, typename = typename T::mapped_type>
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auto GetKey(const typename T::value_type& pair, int) -> decltype(get<0>(pair)) {
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return get<0>(pair);
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}
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// If it is not a map, return the value directly.
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template <typename T>
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const typename T::key_type& GetKey(const typename T::key_type& key, char) {
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return key;
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}
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// Containers should specialize this to provide debug information for that
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// container.
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template <class Container, typename Enabler = void>
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struct HashtableDebugAccess {
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// Returns the number of probes required to find `key` in `c`. The "number of
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// probes" is a concept that can vary by container. Implementations should
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// return 0 when `key` was found in the minimum number of operations and
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// should increment the result for each non-trivial operation required to find
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// `key`.
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//
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// The default implementation uses the bucket api from the standard and thus
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// works for `std::unordered_*` containers.
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static size_t GetNumProbes(const Container& c,
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const typename Container::key_type& key) {
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if (!c.bucket_count()) return {};
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size_t num_probes = 0;
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size_t bucket = c.bucket(key);
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for (auto it = c.begin(bucket), e = c.end(bucket);; ++it, ++num_probes) {
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if (it == e) return num_probes;
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if (c.key_eq()(key, GetKey<Container>(*it, 0))) return num_probes;
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}
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}
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// Returns the number of bytes requested from the allocator by the container
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// and not freed.
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//
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// static size_t AllocatedByteSize(const Container& c);
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// Returns a tight lower bound for AllocatedByteSize(c) where `c` is of type
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// `Container` and `c.size()` is equal to `num_elements`.
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//
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// static size_t LowerBoundAllocatedByteSize(size_t num_elements);
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};
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} // namespace hashtable_debug_internal
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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_HASHTABLE_DEBUG_HOOKS_H_
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