Trait Transform 

pub trait Transform {
    // Required methods
    fn name(&self) -> String;
    fn add_row(&mut self, headers: &Headers, row: &Row) -> Result<(), Error>;
    fn value(&self) -> String;

    // Provided method
    fn hash(
        &self,
        _hasher: &mut DefaultHasher,
        _headers: &Headers,
        _row: &Row,
    ) -> Result<(), Error> { ... }
}

For grouping and reducing rows.

Required Methods

fn name(&self) -> String

Get the resulting column name

fn add_row(&mut self, headers: &Headers, row: &Row) -> Result<(), Error>

Combine the row with the value

fn value(&self) -> String

Turn the current value to a string

Provided Methods

fn hash( &self, _hasher: &mut DefaultHasher, _headers: &Headers, _row: &Row, ) -> Result<(), Error>

Add the row to the hasher to group this row separately from others

Dyn Compatibility

This trait is dyn compatible.

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

Implementors