-- 7d0468a6610ed85586d5c87fd65de8dac5118923 by Derek Mauro <dmauro@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 313226473 -- 1131ef6d116f5ce7d46537a82f300ea06dcaaa53 by Gennadiy Rozental <rogeeff@google.com>: Migrate internal interface to use mutable references. PiperOrigin-RevId: 312931131 -- 96225212a9f5fbd0b38c71fe65539164992c7c3b by Laramie Leavitt <lar@google.com>: Remove random/internal/distributions.h This file was something of an historical artifact. All of the related code has either been removed or migraged, and so the only remaining type belongs with uniform_helper.h, as it is used to infer the return type of the absl::Uniform method in a few cases. PiperOrigin-RevId: 312878173 -- 6dcbd5be58ad425e08740ff64088373ee7fe4a72 by Mark Barolak <mbar@google.com>: Release the StrFormat test case for Cords to open source. PiperOrigin-RevId: 312707974 -- 34484d18dfb63a0a7ad6e2aaeb570e33592968be by Abseil Team <absl-team@google.com>: Let Cord::Cord(string&&), Cord::operator=(string&&), Cord::Append(string&&), and Cord::Prepend(string&&) steal string data and embed it into the Cord as a single external chunk, instead of copying it into flat chunks (at most 4083-byte each). Stealing string data is faster, but it creates a long chunk, which leads to a higher more memory usage if its subcords are created and outlive the whole Cord. These functions revert to copying the data if any of the following conditions holds: - string size is at most kMaxBytesToCopy (511), to avoid the overhead of an external chunk for short strings; - less than half of string capacity is used, to avoid pinning to much unused memory. PiperOrigin-RevId: 312683785 GitOrigin-RevId: 7d0468a6610ed85586d5c87fd65de8dac5118923 Change-Id: If79b5a1dfe6d53a8ddddbc7da84338f11fc4cfa3pull/695/head
Abseil Team
5 years ago
committed by
Derek Mauro
parent
cf1a02e2dc
commit
33caf1097e
31 changed files with 345 additions and 333 deletions
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// 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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