2 // Copyright 2019 The Abseil Authors.
4 // Licensed under the Apache License, Version 2.0 (the "License");
5 // you may not use this file except in compliance with the License.
6 // You may obtain a copy of the License at
8 // https://www.apache.org/licenses/LICENSE-2.0
10 // Unless required by applicable law or agreed to in writing, software
11 // distributed under the License is distributed on an "AS IS" BASIS,
12 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 // See the License for the specific language governing permissions and
14 // limitations under the License.
16 #ifndef ABSL_FLAGS_USAGE_H_
17 #define ABSL_FLAGS_USAGE_H_
19 #include "absl/strings/string_view.h"
21 // --------------------------------------------------------------------
22 // Usage reporting interfaces
26 // Sets the "usage" message to be used by help reporting routines.
28 // absl::SetProgramUsageMessage(
29 // absl::StrCat("This program does nothing. Sample usage:\n", argv[0],
30 // " <uselessarg1> <uselessarg2>"));
31 // Do not include commandline flags in the usage: we do that for you!
32 // Note: Calling SetProgramUsageMessage twice will trigger a call to std::exit.
33 void SetProgramUsageMessage(absl::string_view new_usage_message);
35 // Returns the usage message set by SetProgramUsageMessage().
36 absl::string_view ProgramUsageMessage();
40 #endif // ABSL_FLAGS_USAGE_H_