Trait num_format::WriteFormatted
source · [−]pub trait WriteFormatted {
fn write_formatted<F, N>(&mut self, n: &N, format: &F) -> Result<usize, Error>
where
F: Format,
N: ToFormattedString;
}Expand description
A key trait. Gives types in the standard library that implement io::Write
or fmt::Write, such as &mut [u8] and &mut String, a write_formatted method for writing
formatted numbers.
Required Methods
sourcefn write_formatted<F, N>(&mut self, n: &N, format: &F) -> Result<usize, Error>where
F: Format,
N: ToFormattedString,
fn write_formatted<F, N>(&mut self, n: &N, format: &F) -> Result<usize, Error>where
F: Format,
N: ToFormattedString,
Formats the provided number according to the provided format and then writes the resulting
bytes to the object. Meant to be analagous to io::Write’s write_all method or
fmt::Write’s write_str method. On success, returns the number of bytes written.
Errors
Returns an io::Error under the same conditions as io::Write’s write_all method.