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
91 lines
3 KiB
C++
91 lines
3 KiB
C++
//
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// Copyright 2017 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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// -----------------------------------------------------------------------------
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// File: strip.h
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// -----------------------------------------------------------------------------
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//
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// This file contains various functions for stripping substrings from a string.
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#ifndef ABSL_STRINGS_STRIP_H_
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#define ABSL_STRINGS_STRIP_H_
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#include <cstddef>
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#include <string>
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#include "absl/base/macros.h"
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#include "absl/strings/ascii.h"
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#include "absl/strings/match.h"
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#include "absl/strings/string_view.h"
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namespace absl {
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ABSL_NAMESPACE_BEGIN
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// ConsumePrefix()
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//
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// Strips the `expected` prefix from the start of the given string, returning
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// `true` if the strip operation succeeded or false otherwise.
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//
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// Example:
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//
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// absl::string_view input("abc");
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// EXPECT_TRUE(absl::ConsumePrefix(&input, "a"));
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// EXPECT_EQ(input, "bc");
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inline bool ConsumePrefix(absl::string_view* str, absl::string_view expected) {
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if (!absl::StartsWith(*str, expected)) return false;
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str->remove_prefix(expected.size());
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return true;
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}
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// ConsumeSuffix()
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//
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// Strips the `expected` suffix from the end of the given string, returning
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// `true` if the strip operation succeeded or false otherwise.
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//
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// Example:
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//
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// absl::string_view input("abcdef");
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// EXPECT_TRUE(absl::ConsumeSuffix(&input, "def"));
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// EXPECT_EQ(input, "abc");
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inline bool ConsumeSuffix(absl::string_view* str, absl::string_view expected) {
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if (!absl::EndsWith(*str, expected)) return false;
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str->remove_suffix(expected.size());
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return true;
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}
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// StripPrefix()
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//
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// Returns a view into the input string 'str' with the given 'prefix' removed,
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// but leaving the original string intact. If the prefix does not match at the
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// start of the string, returns the original string instead.
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ABSL_MUST_USE_RESULT inline absl::string_view StripPrefix(
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absl::string_view str, absl::string_view prefix) {
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if (absl::StartsWith(str, prefix)) str.remove_prefix(prefix.size());
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return str;
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}
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// StripSuffix()
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//
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// Returns a view into the input string 'str' with the given 'suffix' removed,
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// but leaving the original string intact. If the suffix does not match at the
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// end of the string, returns the original string instead.
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ABSL_MUST_USE_RESULT inline absl::string_view StripSuffix(
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absl::string_view str, absl::string_view suffix) {
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if (absl::EndsWith(str, suffix)) str.remove_suffix(suffix.size());
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return str;
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}
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ABSL_NAMESPACE_END
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} // namespace absl
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#endif // ABSL_STRINGS_STRIP_H_
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