Add 'third_party/abseil_cpp/' from commit '768eb2ca28'

git-subtree-dir: third_party/abseil_cpp
git-subtree-mainline: ffb2ae54be
git-subtree-split: 768eb2ca28

third_party/abseil_cpp/absl/flags/parse.h

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+//
+// 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: parse.h
+// -----------------------------------------------------------------------------
+//
+// This file defines the main parsing function for Abseil flags:
+// `absl::ParseCommandLine()`.
+
+#ifndef ABSL_FLAGS_PARSE_H_
+#define ABSL_FLAGS_PARSE_H_
+
+#include <string>
+#include <vector>
+
+#include "absl/base/config.h"
+#include "absl/flags/internal/parse.h"
+
+namespace absl {
+ABSL_NAMESPACE_BEGIN
+
+// ParseCommandLine()
+//
+// Parses the set of command-line arguments passed in the `argc` (argument
+// count) and `argv[]` (argument vector) parameters from `main()`, assigning
+// values to any defined Abseil flags. (Any arguments passed after the
+// flag-terminating delimiter (`--`) are treated as positional arguments and
+// ignored.)
+//
+// Any command-line flags (and arguments to those flags) are parsed into Abseil
+// Flag values, if those flags are defined. Any undefined flags will either
+// return an error, or be ignored if that flag is designated using `undefok` to
+// indicate "undefined is OK."
+//
+// Any command-line positional arguments not part of any command-line flag (or
+// arguments to a flag) are returned in a vector, with the program invocation
+// name at position 0 of that vector. (Note that this includes positional
+// arguments after the flag-terminating delimiter `--`.)
+//
+// After all flags and flag arguments are parsed, this function looks for any
+// built-in usage flags (e.g. `--help`), and if any were specified, it reports
+// help messages and then exits the program.
+std::vector<char*> ParseCommandLine(int argc, char* argv[]);
+
+ABSL_NAMESPACE_END
+}  // namespace absl
+
+#endif  // ABSL_FLAGS_PARSE_H_