dyn_fmt

Trait AsStrFormatExt

Source 
pub trait AsStrFormatExt: AsRef<str> {
    // Provided method
    fn format<'a, T: Display + ?Sized + 'a>(
        &self,
        args: impl IntoIterator<Item = &'a T> + Clone,
    ) -> String { ... }
}
Expand description

Extends strings with the format method, which is a runtime analog of the format! macro. Unavailable in no_std environment.

Provided Methods§

Source

fn format<'a, T: Display + ?Sized + 'a>( &self, args: impl IntoIterator<Item = &'a T> + Clone, ) -> String

Creates a String replacing the {}s within self using provided parameters in the order given. A runtime analog of format! macro. In contrast with the macro format string have not be a string literal.

§Examples:
use dyn_fmt::AsStrFormatExt;
assert_eq!("{}a{}b{}c".format(&[1, 2, 3]), "1a2b3c");
assert_eq!("{}a{}b{}c".format(&[1, 2, 3, 4]), "1a2b3c"); // extra arguments are ignored
assert_eq!("{}a{}b{}c".format(&[1, 2]), "1a2bc"); // missing arguments are replaced by empty string
assert_eq!("{{}}{}".format(&[1, 2]), "{}1");

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.

Implementors§