Trait WriteExt 

pub trait WriteExt: Write {
    // Provided methods
    unsafe fn write_unchecked(
        &mut self,
        buffer: &[u8],
        start_index: usize,
        count: usize,
    ) -> Result<usize> { ... }
    unsafe fn write_all_unchecked(
        &mut self,
        buffer: &[u8],
        start_index: usize,
        count: usize,
    ) -> Result<()> { ... }
}

Extension methods for Write values.

WriteExt provides small method-style helpers for byte writers. The methods are implemented for every type that implements Write, including dyn Write trait objects.

Provided Methods

unsafe fn write_unchecked( &mut self, buffer: &[u8], start_index: usize, count: usize, ) -> Result<usize>

Writes bytes from a range of buffer without checking the range bounds in release builds.

This method delegates to Write::write after creating the source slice with raw pointer arithmetic. It performs at most one write operation and returns the number of bytes written, keeping the same short-write and error behavior as Write::write.

Parameters

• buffer: Source buffer.
• start_index: Start offset inside buffer.
• count: Maximum number of bytes to write.

Returns

The number of bytes written from buffer[start_index..start_index + count]. The value is in 0..=count.

Errors

Returns the error reported by Write::write.

Safety

The caller must guarantee that start_index..start_index + count is a valid range within buffer and that start_index + count does not overflow usize.

unsafe fn write_all_unchecked( &mut self, buffer: &[u8], start_index: usize, count: usize, ) -> Result<()>

Writes exactly count bytes from a range of buffer without checking the range bounds in release builds.

This method delegates to Write::write_all after creating the source slice with raw pointer arithmetic. It keeps the same short-write, std::io::ErrorKind::Interrupted, and std::io::ErrorKind::WriteZero behavior as Write::write_all.

Parameters

• buffer: Source buffer.
• start_index: Start offset inside buffer.
• count: Number of bytes to write.

Errors

Returns the error reported by Write::write_all.

Safety

The caller must guarantee that start_index..start_index + count is a valid range within buffer and that start_index + count does not overflow usize.

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors

impl<T> WriteExt for T

where T: Write + ?Sized,