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//! How to add `no-thing` flag which is `true` by default and
//! `false` if passed.
//!
//! Running this example with --help prints this message:
//! -----------------------------------------------------
//! structopt 0.3.25
//!
//! USAGE:
//! negative_flag [FLAGS]
//!
//! FLAGS:
//! -h, --help Prints help information
//! -V, --version Prints version information
//! --no-verbose
//! -----------------------------------------------------
use structopt::StructOpt;
#[derive(Debug, StructOpt)]
struct Opt {
#[structopt(long = "no-verbose", parse(from_flag = std::ops::Not::not))]
verbose: bool,
}
fn main() {
let cmd = Opt::from_args();
println!("{:#?}", cmd);
}
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