Trait FromUserData 

pub trait FromUserData<T> {
    // Required method
    fn from_user_data(data: &T) -> Self;
}

Constructor for aggregate functions.

Aggregate functions are instantiated using user data provided when the function is registered. There is a blanket implementation for types implementing Default for cases where user data is not required.

Required Methods

fn from_user_data(data: &T) -> Self

Construct a new instance based on the provided user data.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors

impl<U, F: Default> FromUserData<U> for F