Launchpad.net.gnuflag is a package library for creating, parsing and managing flags in Go programming language. One of the key functions of this package is to create a FlagSet, which allows for the creation and management of flags, including parsing and usage descriptions.
This code creates a new FlagSet object with the name "example" and the default behavior of exiting on error.
Example 2: Adding flags to a FlagSet
// Adding a boolean flag flagSet.Bool("verbose", false, "enable verbose logging")
// Adding an integer flag flagSet.Int("port", 8080, "set the port number")
These lines add two different types of flags to the FlagSet object. The first line adds a boolean flag called "verbose" with a default value of false and a description of "enable verbose logging". The second line adds an integer flag called "port" with a default value of 8080 and a description of "set the port number".
Example 3: Parsing command-line arguments
// Parse the command-line arguments err := flagSet.Parse(os.Args[1:])
if err != nil { log.Fatal(err) }
This code parses the command-line arguments passed to the application, using the FlagSet object created earlier. If an error occurs during parsing, the program will exit with an error message.
Overall, the Launchpad.net.gnuflag library is a useful tool for managing flags in Go applications, allowing for easy creation and parsing of different types of flags.
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