Trait FormatArgument 

pub trait FormatArgument {
    // Required methods
    fn supports_format(&self, specifier: &Specifier) -> bool;
    fn fmt_display(&self, f: &mut Formatter<'_>) -> Result;
    fn fmt_debug(&self, f: &mut Formatter<'_>) -> Result;
    fn fmt_octal(&self, f: &mut Formatter<'_>) -> Result;
    fn fmt_lower_hex(&self, f: &mut Formatter<'_>) -> Result;
    fn fmt_upper_hex(&self, f: &mut Formatter<'_>) -> Result;
    fn fmt_binary(&self, f: &mut Formatter<'_>) -> Result;
    fn fmt_lower_exp(&self, f: &mut Formatter<'_>) -> Result;
    fn fmt_upper_exp(&self, f: &mut Formatter<'_>) -> Result;

    // Provided method
    fn to_usize(&self) -> Result<usize, ()> { ... }
}

A type that indicates whether its value supports a specific format, and provides formatting functions that correspond to different format types.

Required Methods

fn supports_format(&self, specifier: &Specifier) -> bool

Returns true if self can be formatted using the given specifier.

fn fmt_display(&self, f: &mut Formatter<'_>) -> Result

Formats the value the way it would be formatted if it implemented std::fmt::Display.

fn fmt_debug(&self, f: &mut Formatter<'_>) -> Result

Formats the value the way it would be formatted if it implemented std::fmt::Debug.

fn fmt_octal(&self, f: &mut Formatter<'_>) -> Result

Formats the value the way it would be formatted if it implemented std::fmt::Octal.

fn fmt_lower_hex(&self, f: &mut Formatter<'_>) -> Result

Formats the value the way it would be formatted if it implemented std::fmt::LowerHex.

fn fmt_upper_hex(&self, f: &mut Formatter<'_>) -> Result

Formats the value the way it would be formatted if it implemented std::fmt::UpperHex.

fn fmt_binary(&self, f: &mut Formatter<'_>) -> Result

Formats the value the way it would be formatted if it implemented std::fmt::Binary.

fn fmt_lower_exp(&self, f: &mut Formatter<'_>) -> Result

Formats the value the way it would be formatted if it implemented std::fmt::LowerExp.

fn fmt_upper_exp(&self, f: &mut Formatter<'_>) -> Result

Formats the value the way it would be formatted if it implemented std::fmt::UpperExp.

Provided Methods

fn to_usize(&self) -> Result<usize, ()>

Performs a type conversion into usize that might fail. Like TryInto<usize>, but does not consume self. The parser uses this to support formats whose width or precision use “dollar syntax”. For more information about these, see std::fmt. The default implementation always returns an error.

Implementors