Trait Usage 

pub trait Usage {
    const NAME: &'static str;
    const DESCRIPTION: Description<'static>;
    const ITEMS: UsageItems<'static>;
}

A comprehensive description of the CLI parameters for a given FromArgs type. A type’s Usage is used to create a --help usage message. This trait is usually derived.

Required Associated Constants

const NAME: &'static str

The name of the command. Can be replaced with argv[0].

const DESCRIPTION: Description<'static>

The top-level text description of the whole command.

const ITEMS: UsageItems<'static>

The items (parameters, subcommands, and so on) in this command.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementations on Foreign Types

impl<T: Usage> Usage for Option<T>

const NAME: &'static str = T::NAME

const DESCRIPTION: Description<'static> = T::DESCRIPTION

const ITEMS: UsageItems<'static>

Implementors