From aa468ad75539619b47979911297efbb629c52e44 Mon Sep 17 00:00:00 2001 From: Abseil Team Date: Tue, 7 May 2019 12:56:42 -0700 Subject: Export of internal Abseil changes. -- 78293ba4eb4981991ae7e6edd25eb9245fcd7515 by Andy Soffer : internal changes PiperOrigin-RevId: 247073879 -- 7bd97e3aad0c3012b89a39392a6ad3f254e9f3c3 by Derek Mauro : Release commandline flags PiperOrigin-RevId: 247065920 -- 2a991849fd7b140a43b073076d194b61533fd199 by Tom Manshreck : Add documentation for built-in usage flags PiperOrigin-RevId: 247058863 -- 14157b0de45841706bbd631284191fd94c313db9 by Derek Mauro : Internal change PiperOrigin-RevId: 247058292 -- ed67e0a80468596e30540b367727a250fa415b68 by Abseil Team : Internal Change. PiperOrigin-RevId: 246828655 -- e1bc8c2aa3f90b3d56c55c5b7244e718c919265d by Abseil Team : Internal change PiperOrigin-RevId: 246822325 -- 907a68f287199f749cb9bdb48571b50bc34731e1 by Eric Fiselier : Accept vector::reference in StrCat and friends. Converting vector::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 : Clarify the proper way to define AbslHashValue, and fix confusing indentation. PiperOrigin-RevId: 246406528 -- d7174681a72d4a25c8fd2b4d9f515a0763eff87c by Gennadiy Rozental : Internal change PiperOrigin-RevId: 246358214 -- a7fdc19683cf1a5885e9e1af52fcdb2db1eda53b by Abseil Team : Fix sample template instantiation. PiperOrigin-RevId: 246354617 -- 29a23c6835f872948d09b24d890385bf195bc995 by Abseil Team : 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 : Import of CCTZ from GitHub. PiperOrigin-RevId: 245418790 -- 7f90a7f94cdd5e21232c749efe952a750b5c43a2 by Abseil Team : Internal change PiperOrigin-RevId: 245412658 -- 730a329cf047d54b46971fce1781edd857208c2a by Greg Falcon : internal change PiperOrigin-RevId: 245293234 -- cf0216be6338200cbb18167d3f3b2e98e372be77 by Greg Falcon : Internal change PiperOrigin-RevId: 245288164 GitOrigin-RevId: 78293ba4eb4981991ae7e6edd25eb9245fcd7515 Change-Id: I5ea9a852c36c722bae2d6be65fb7f72473d94ab6 --- absl/flags/declare.h | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 58 insertions(+) create mode 100644 absl/flags/declare.h (limited to 'absl/flags/declare.h') diff --git a/absl/flags/declare.h b/absl/flags/declare.h new file mode 100644 index 0000000..556ec5e --- /dev/null +++ b/absl/flags/declare.h @@ -0,0 +1,58 @@ +// +// 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. +// +// ----------------------------------------------------------------------------- +// File: declare.h +// ----------------------------------------------------------------------------- +// +// This file defines the ABSL_DECLARE_FLAG macro, allowing you to declare an +// `absl::Flag` for use within a translation unit. You should place this +// declaration within the header file associated with the .cc file that defines +// and owns the `Flag`. + +#ifndef ABSL_FLAGS_DECLARE_H_ +#define ABSL_FLAGS_DECLARE_H_ + +#include "absl/strings/string_view.h" + +namespace absl { +namespace flags_internal { + +// absl::Flag represents a flag of type 'T' created by ABSL_FLAG. +template +class Flag; + +} // namespace flags_internal + +// Flag +// +// Forward declaration of the `absl::Flag` type for use in defining the macro. +template +using Flag = flags_internal::Flag; + +} // namespace absl + +// ABSL_DECLARE_FLAG() +// +// This macro is a convenience for declaring use of an `absl::Flag` within a +// translation unit. This macro should be used within a header file to +// declare usage of the flag within any .cc file including that header file. +// +// The ABSL_DECLARE_FLAG(type, name) macro expands to: +// +// extern absl::Flag FLAGS_name; +#define ABSL_DECLARE_FLAG(type, name) extern ::absl::Flag FLAGS_##name + +#endif // ABSL_FLAGS_DECLARE_H_ -- cgit v1.2.3