diff options
author | Abseil Team <absl-team@google.com> | 2019-05-07T19·56-0700 |
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committer | Eric Fiselier <eric@efcs.ca> | 2019-05-07T20·32-0400 |
commit | aa468ad75539619b47979911297efbb629c52e44 (patch) | |
tree | 660bdd268ea4bb18d565b253cce6b6a6bbca0590 /absl/flags/internal/type_erased.h | |
parent | cd86d0d20ab167c33b23d3875db68d1d4bad3a3b (diff) |
Export of internal Abseil changes.
-- 78293ba4eb4981991ae7e6edd25eb9245fcd7515 by Andy Soffer <asoffer@google.com>: internal changes PiperOrigin-RevId: 247073879 -- 7bd97e3aad0c3012b89a39392a6ad3f254e9f3c3 by Derek Mauro <dmauro@google.com>: Release commandline flags PiperOrigin-RevId: 247065920 -- 2a991849fd7b140a43b073076d194b61533fd199 by Tom Manshreck <shreck@google.com>: Add documentation for built-in usage flags PiperOrigin-RevId: 247058863 -- 14157b0de45841706bbd631284191fd94c313db9 by Derek Mauro <dmauro@google.com>: Internal change PiperOrigin-RevId: 247058292 -- ed67e0a80468596e30540b367727a250fa415b68 by Abseil Team <absl-team@google.com>: Internal Change. PiperOrigin-RevId: 246828655 -- e1bc8c2aa3f90b3d56c55c5b7244e718c919265d by Abseil Team <absl-team@google.com>: Internal change PiperOrigin-RevId: 246822325 -- 907a68f287199f749cb9bdb48571b50bc34731e1 by Eric Fiselier <ericwf@google.com>: Accept vector<bool>::reference in StrCat and friends. Converting vector<bool>::reference to alphanum requires two user defined conversions, which isn't allowed. In order to accept this, we need a special constructor that is only enabled for the bool proxy types. PiperOrigin-RevId: 246626732 -- fe4295fa95cc65dee8c881ba12dd8f516e68c40d by Abseil Team <absl-team@google.com>: Clarify the proper way to define AbslHashValue, and fix confusing indentation. PiperOrigin-RevId: 246406528 -- d7174681a72d4a25c8fd2b4d9f515a0763eff87c by Gennadiy Rozental <rogeeff@google.com>: Internal change PiperOrigin-RevId: 246358214 -- a7fdc19683cf1a5885e9e1af52fcdb2db1eda53b by Abseil Team <absl-team@google.com>: Fix sample template instantiation. PiperOrigin-RevId: 246354617 -- 29a23c6835f872948d09b24d890385bf195bc995 by Abseil Team <absl-team@google.com>: Fix incorrectly copy-pasted static_assert in absl::optional::value_or The static_assert for a move-constructible type previously said the type must be copy-constructible. PiperOrigin-RevId: 246313827 -- 41884d5872d4ea2c67875b00144b8c8a5859a295 by Greg Falcon <gfalcon@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 245418790 -- 7f90a7f94cdd5e21232c749efe952a750b5c43a2 by Abseil Team <absl-team@google.com>: Internal change PiperOrigin-RevId: 245412658 -- 730a329cf047d54b46971fce1781edd857208c2a by Greg Falcon <gfalcon@google.com>: internal change PiperOrigin-RevId: 245293234 -- cf0216be6338200cbb18167d3f3b2e98e372be77 by Greg Falcon <gfalcon@google.com>: Internal change PiperOrigin-RevId: 245288164 GitOrigin-RevId: 78293ba4eb4981991ae7e6edd25eb9245fcd7515 Change-Id: I5ea9a852c36c722bae2d6be65fb7f72473d94ab6
Diffstat (limited to 'absl/flags/internal/type_erased.h')
-rw-r--r-- | absl/flags/internal/type_erased.h | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/absl/flags/internal/type_erased.h b/absl/flags/internal/type_erased.h new file mode 100644 index 000000000000..249d36b9f33f --- /dev/null +++ b/absl/flags/internal/type_erased.h @@ -0,0 +1,97 @@ +// +// Copyright 2019 The Abseil Authors. +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// https://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +#ifndef ABSL_FLAGS_INTERNAL_TYPE_ERASED_H_ +#define ABSL_FLAGS_INTERNAL_TYPE_ERASED_H_ + +#include <string> + +#include "absl/flags/internal/commandlineflag.h" +#include "absl/flags/internal/registry.h" + +// -------------------------------------------------------------------- +// Registry interfaces operating on type erased handles. + +namespace absl { +namespace flags_internal { + +// If a flag named "name" exists, store its current value in *OUTPUT +// and return true. Else return false without changing *OUTPUT. +// Thread-safe. +bool GetCommandLineOption(absl::string_view name, std::string* value); + +// If a flag named "name" exists, store its information in *OUTPUT +// and return true. Else return false without changing *OUTPUT. +// Thread-safe. +bool GetCommandLineFlagInfo(absl::string_view name, + CommandLineFlagInfo* OUTPUT); + +// Returns the CommandLineFlagInfo of the flagname. exit() with an +// error code if name not found. +// Thread-safe. +CommandLineFlagInfo GetCommandLineFlagInfoOrDie(absl::string_view name); + +// Set the value of the flag named "name" to value. If successful, +// returns true. If not successful (e.g., the flag was not found or +// the value is not a valid value), returns false. +// Thread-safe. +bool SetCommandLineOption(absl::string_view name, absl::string_view value); + +bool SetCommandLineOptionWithMode(absl::string_view name, + absl::string_view value, + FlagSettingMode set_mode); + +//----------------------------------------------------------------------------- + +// Returns true iff all of the following conditions are true: +// (a) "name" names a registered flag +// (b) "value" can be parsed succesfully according to the type of the flag +// (c) parsed value passes any validator associated with the flag +bool IsValidFlagValue(absl::string_view name, absl::string_view value); + +//----------------------------------------------------------------------------- + +// Returns true iff a flag named "name" was specified on the command line +// (either directly, or via one of --flagfile or --fromenv or --tryfromenv). +// +// Any non-command-line modification of the flag does not affect the +// result of this function. So for example, if a flag was passed on +// the command line but then reset via SET_FLAGS_DEFAULT, this +// function will still return true. +bool SpecifiedOnCommandLine(absl::string_view name); + +//----------------------------------------------------------------------------- + +// If a flag with specified "name" exists and has type T, store +// its current value in *dst and return true. Else return false +// without touching *dst. T must obey all of the requirements for +// types passed to DEFINE_FLAG. +template <typename T> +inline bool GetByName(absl::string_view name, T* dst) { + CommandLineFlag* flag = flags_internal::FindCommandLineFlag(name); + if (!flag) return false; + + if (auto val = flag->Get<T>()) { + *dst = *val; + return true; + } + + return false; +} + +} // namespace flags_internal +} // namespace absl + +#endif // ABSL_FLAGS_INTERNAL_TYPE_ERASED_H_ |