48 lines
1.3 KiB
Rust
48 lines
1.3 KiB
Rust
use crate::{LensOver, LensView};
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pub struct _0;
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macro_rules! make {
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($f:ident, ( $( $v:ident ),* ), ( $( $t:ident ),* ) ) => {
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impl< $($t,)* > LensView<( $($t,)* )> for _0 {
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type Field = T;
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fn view(( $($v,)* ): ($($t,)*)) -> Self::Field {
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$f
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}
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}
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impl< $($t,)* > LensOver<( $($t,)* )> for _0 {
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fn over(
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mut tup: ($($t,)*),
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f: &dyn Fn(Self::Field) -> Self::Field
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) -> ( $($t,)* ) {
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tup.0 = f(tup.0);
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tup
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}
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}
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impl<'a, $($t,)* > LensView<&'a ( $($t,)* )> for _0 {
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type Field = &'a T;
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fn view(( $($v,)* ): &'a ($($t,)*)) -> Self::Field {
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$f
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}
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}
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impl<'a, $($t,)* > LensView<&'a mut ( $($t,)* )> for _0 {
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type Field = &'a mut T;
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fn view(( $($v,)* ): &'a mut ($($t,)*)) -> Self::Field {
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$f
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}
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}
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};
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}
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make!(t, (t, _u), (T, U));
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make!(t, (t, _u, _v), (T, U, V));
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make!(t, (t, _u, _v, _w), (T, U, V, W));
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make!(t, (t, _u, _v, _w, _x), (T, U, V, W, X));
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make!(t, (t, _u, _v, _w, _x, _y), (T, U, V, W, X, Y));
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make!(t, (t, _u, _v, _w, _x, _y, _z), (T, U, V, W, X, Y, Z));
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// not doing more cause i'm lazy, open a pr if you need more :)
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