Type Definition cuba::Integrand

type Integrand<T> = fn(x: &[f64], f: &mut [f64], user_data: &mut T, nvec: usize, core: i32) -> Result<(), &'static str>;

Integrand evaluation function.

The dimensions of random input variables x and output f are provided to the integration routine as dimension and components respectively. T can be any type. If you don't want to provide user data, simply make T a usize and provide any number.

core specifies the current core that is being used. This can be used to write to the user data in a thread-safe way.

On returning an error, the integration will be aborted.