50 lines
1.2 KiB
Rust
50 lines
1.2 KiB
Rust
//! Helper module which defines `FnArgs`
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//! to make function calling easier.
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use crate::any::{Any, Variant};
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/// Trait that represent arguments to a function call.
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pub trait FuncArgs<'a> {
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/// Convert to a `Vec` of `Variant` arguments.
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fn into_vec(self) -> Vec<&'a mut Variant>;
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}
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impl<'a> FuncArgs<'a> for Vec<&'a mut Variant> {
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fn into_vec(self) -> Self {
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self
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}
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}
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impl<'a, T: Any> FuncArgs<'a> for &'a mut Vec<T> {
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fn into_vec(self) -> Vec<&'a mut Variant> {
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self.iter_mut().map(|x| x as &mut Variant).collect()
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}
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}
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macro_rules! impl_args {
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($($p:ident),*) => {
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impl<'a, $($p: Any + Clone),*> FuncArgs<'a> for ($(&'a mut $p,)*)
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{
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fn into_vec(self) -> Vec<&'a mut Variant> {
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let ($($p,)*) = self;
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#[allow(unused_variables, unused_mut)]
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let mut v = Vec::new();
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$(v.push($p as &mut Variant);)*
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v
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}
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}
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impl_args!(@pop $($p),*);
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};
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(@pop) => {
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};
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(@pop $head:ident $(, $tail:ident)*) => {
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impl_args!($($tail),*);
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};
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}
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#[cfg_attr(rustfmt, rustfmt_skip)]
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impl_args!(A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S);
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