rhai/src/fn_args.rs
2020-10-28 22:18:44 +08:00

46 lines
1.2 KiB
Rust

//! Helper module which defines `FuncArgs` to make function calling easier.
#![allow(non_snake_case)]
use crate::dynamic::{Dynamic, Variant};
use crate::StaticVec;
/// Trait that represents arguments to a function call.
/// Any data type that can be converted into a `Vec<Dynamic>` can be used
/// as arguments to a function call.
pub trait FuncArgs {
/// Convert to a `StaticVec<Dynamic>` of the function call arguments.
fn into_vec(self) -> StaticVec<Dynamic>;
}
/// Macro to implement `FuncArgs` for tuples of standard types (each can be
/// converted into `Dynamic`).
macro_rules! impl_args {
($($p:ident),*) => {
impl<$($p: Variant + Clone),*> FuncArgs for ($($p,)*)
{
#[inline]
fn into_vec(self) -> StaticVec<Dynamic> {
let ($($p,)*) = self;
let mut _v = StaticVec::new();
$(_v.push($p.into_dynamic());)*
_v
}
}
impl_args!(@pop $($p),*);
};
(@pop) => {
};
(@pop $head:ident) => {
impl_args!();
};
(@pop $head:ident $(, $tail:ident)+) => {
impl_args!($($tail),*);
};
}
impl_args!(A, B, C, D, E, F, G, H, J, K, L, M, N, P, Q, R, S, T, U, V);