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
92 lines
2.8 KiB
C++
92 lines
2.8 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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// Adapts a policy for nodes.
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//
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// The node policy should model:
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//
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// struct Policy {
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// // Returns a new node allocated and constructed using the allocator, using
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// // the specified arguments.
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// template <class Alloc, class... Args>
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// value_type* new_element(Alloc* alloc, Args&&... args) const;
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//
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// // Destroys and deallocates node using the allocator.
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// template <class Alloc>
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// void delete_element(Alloc* alloc, value_type* node) const;
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// };
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//
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// It may also optionally define `value()` and `apply()`. For documentation on
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// these, see hash_policy_traits.h.
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#ifndef ABSL_CONTAINER_INTERNAL_NODE_HASH_POLICY_H_
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#define ABSL_CONTAINER_INTERNAL_NODE_HASH_POLICY_H_
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#include <cassert>
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#include <cstddef>
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#include <memory>
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#include <type_traits>
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#include <utility>
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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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template <class Reference, class Policy>
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struct node_hash_policy {
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static_assert(std::is_lvalue_reference<Reference>::value, "");
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using slot_type = typename std::remove_cv<
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typename std::remove_reference<Reference>::type>::type*;
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template <class Alloc, class... Args>
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static void construct(Alloc* alloc, slot_type* slot, Args&&... args) {
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*slot = Policy::new_element(alloc, std::forward<Args>(args)...);
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}
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template <class Alloc>
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static void destroy(Alloc* alloc, slot_type* slot) {
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Policy::delete_element(alloc, *slot);
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}
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template <class Alloc>
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static void transfer(Alloc*, slot_type* new_slot, slot_type* old_slot) {
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*new_slot = *old_slot;
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}
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static size_t space_used(const slot_type* slot) {
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if (slot == nullptr) return Policy::element_space_used(nullptr);
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return Policy::element_space_used(*slot);
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}
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static Reference element(slot_type* slot) { return **slot; }
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template <class T, class P = Policy>
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static auto value(T* elem) -> decltype(P::value(elem)) {
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return P::value(elem);
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}
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template <class... Ts, class P = Policy>
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static auto apply(Ts&&... ts) -> decltype(P::apply(std::forward<Ts>(ts)...)) {
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return P::apply(std::forward<Ts>(ts)...);
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}
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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_NODE_HASH_POLICY_H_
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