Struct custom_print::FmtTryWriter

pub struct FmtTryWriter<F1>(_);

A writer that calls write_str for each formatted chunk, but do not require allocations.

Write function can return either () or fmt::Result.

Writer propagates error to the caller if the write function returns Result::Err. Note that the error context will be lost, because fmt::Error does not support transmission of an error other than that an error occurred.

Implementations

impl<F1> FmtTryWriter<F1> where
    F1: WriteStr, 

pub fn new(write: F1) -> Self

Creates a new FmtTryWriter from an object that implements WriteStr.

pub fn from_closure<F, Ts>(closure: F) -> Self where
    F: IntoTryWriteFn<Ts, TryWriteFn = F1>, 

Creates a new FmtTryWriter with a WriteStr wrapper deduced with IntoTryWriteFn by the closure signature and constructed from it.

impl<F1> FmtTryWriter<F1> where
    Self: Write, 

pub fn write_fmt(&mut self, args: Arguments<'_>) -> Result

Writes a formatted string into this writer, returning any error encountered.

This method is primarily used to interface with the format_args! macro, but it is rare that this should explicitly be called. The write! macro should be favored to invoke this method instead.

Trait Implementations

impl<F1: Clone> Clone for FmtTryWriter<F1>

fn clone(&self) -> FmtTryWriter<F1>

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<F1: Debug> Debug for FmtTryWriter<F1>

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

Formats the value using the given formatter.

impl<F1: PartialEq> PartialEq<FmtTryWriter<F1>> for FmtTryWriter<F1>

fn eq(&self, other: &FmtTryWriter<F1>) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &FmtTryWriter<F1>) -> bool

This method tests for !=.

impl<F1> Write for FmtTryWriter<F1> where
    Self: WriteStr<Output = Result>, 

fn write_str(&mut self, buf: &str) -> Result

Writes a string slice into this writer, returning whether the write succeeded.

fn write_char(&mut self, c: char) -> Result<(), Error>

Writes a char into this writer, returning whether the write succeeded.

fn write_fmt(&mut self, args: Arguments<'_>) -> Result<(), Error>

Glue for usage of the write! macro with implementors of this trait.

impl<F1> WriteBytes for FmtTryWriter<F1> where
    F1: WriteBytes,
    F1::Output: IntoFmtWriteResult, 

type Output = Result

The resulting type after writing.

fn write_bytes(&mut self, buf: &[u8]) -> Self::Output

Performs byte writing.

impl<F1> WriteStr for FmtTryWriter<F1> where
    F1: WriteStr,
    F1::Output: IntoFmtWriteResult, 

type Output = Result

The resulting type after writing.

fn write_str(&mut self, buf: &str) -> Self::Output

Performs byte writing.

impl<F1: Copy> Copy for FmtTryWriter<F1>

impl<F1: Eq> Eq for FmtTryWriter<F1>

impl<F1> StructuralEq for FmtTryWriter<F1>

impl<F1> StructuralPartialEq for FmtTryWriter<F1>