specta 2.0.0-rc.9

Easily export your Rust types to other languages
Documentation 
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use std::future::Future;

use crate::{DataType, Type, TypeMap};

/// Implemented by types that can be returned from a function annotated with
/// [`specta`](crate::specta).
pub trait FunctionResult<TMarker> {
    /// Gets the type of the result as a [`DataType`].
    fn to_datatype(type_map: &mut TypeMap) -> DataType;
}

pub enum FunctionResultMarker {}
impl<T: Type> FunctionResult<FunctionResultMarker> for T {
    fn to_datatype(type_map: &mut TypeMap) -> DataType {
        T::reference(type_map, &[]).inner
    }
}

pub enum FunctionResultFutureMarker {}
impl<F> FunctionResult<FunctionResultFutureMarker> for F
where
    F: Future,
    F::Output: Type,
{
    fn to_datatype(type_map: &mut TypeMap) -> DataType {
        F::Output::reference(type_map, &[]).inner
    }
}