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
52 lines
2.1 KiB
C++
52 lines
2.1 KiB
C++
// Copyright 2019 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_RANDOM_INTERNAL_DISTRIBUTIONS_H_
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#define ABSL_RANDOM_INTERNAL_DISTRIBUTIONS_H_
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#include <type_traits>
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#include "absl/meta/type_traits.h"
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#include "absl/random/internal/distribution_caller.h"
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#include "absl/random/internal/traits.h"
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#include "absl/random/internal/uniform_helper.h"
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namespace absl {
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ABSL_NAMESPACE_BEGIN
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namespace random_internal {
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// In the absence of an explicitly provided return-type, the template
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// "uniform_inferred_return_t<A, B>" is used to derive a suitable type, based on
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// the data-types of the endpoint-arguments {A lo, B hi}.
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//
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// Given endpoints {A lo, B hi}, one of {A, B} will be chosen as the
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// return-type, if one type can be implicitly converted into the other, in a
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// lossless way. The template "is_widening_convertible" implements the
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// compile-time logic for deciding if such a conversion is possible.
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//
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// If no such conversion between {A, B} exists, then the overload for
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// absl::Uniform() will be discarded, and the call will be ill-formed.
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// Return-type for absl::Uniform() when the return-type is inferred.
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template <typename A, typename B>
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using uniform_inferred_return_t =
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absl::enable_if_t<absl::disjunction<is_widening_convertible<A, B>,
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is_widening_convertible<B, A>>::value,
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typename std::conditional<
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is_widening_convertible<A, B>::value, B, A>::type>;
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} // namespace random_internal
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ABSL_NAMESPACE_END
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} // namespace absl
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#endif // ABSL_RANDOM_INTERNAL_DISTRIBUTIONS_H_
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