99 lines
2.6 KiB
Rust
99 lines
2.6 KiB
Rust
use crate::{LensOver, LensView};
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pub struct _0;
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macro_rules! make_tuples {
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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<F>(
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mut tup: ($($t,)*),
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f: F
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) -> ( $($t,)* )
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where
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F: FnOnce(Self::Field) -> Self::Field
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{
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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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$f
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}
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}
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};
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}
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make_tuples!(t, (t, _u), (T, U));
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make_tuples!(t, (t, _u, _v), (T, U, V));
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make_tuples!(t, (t, _u, _v, _w), (T, U, V, W));
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make_tuples!(t, (t, _u, _v, _w, _x), (T, U, V, W, X));
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make_tuples!(t, (t, _u, _v, _w, _x, _y), (T, U, V, W, X, Y));
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make_tuples!(t, (t, _u, _v, _w, _x, _y, _z), (T, U, V, W, X, Y, Z));
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// not doing more cause i'm lazy, open a pr if you need more :)
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macro_rules! make_arrays {
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($f:ident, $n:expr, [$( $v:ident ),*]) => {
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impl<T> LensView<[T; $n]> for _0 {
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type Field = T;
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fn view([ $($v,)* ]: [T; $n]) -> Self::Field {
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$f
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}
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}
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impl<T> LensOver<[T; $n]> for _0 {
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fn over<F>(
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tup: [T; $n],
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fun: F
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) -> [T; $n]
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where
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F: FnOnce(Self::Field) -> Self::Field
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{
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let [$($v,)*] = tup;
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let $f = fun( $f );
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[$($v,)*]
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}
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}
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impl<'a, T> LensView<&'a [T; $n]> for _0 {
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type Field = &'a T;
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fn view([ $($v,)* ]: &'a [T; $n]) -> Self::Field {
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$f
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}
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}
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impl<'a, T> LensView<&'a mut [T; $n]> for _0 {
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type Field = &'a mut T;
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fn view([ $($v,)* ]: &'a mut [T; $n]) -> Self::Field {
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$f
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}
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}
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};
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}
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make_arrays!(t, 1, [t]);
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make_arrays!(t, 2, [t, _a]);
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make_arrays!(t, 3, [t, _a, _b]);
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make_arrays!(t, 4, [t, _a, _b, _c]);
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make_arrays!(t, 5, [t, _a, _b, _c, _d]);
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make_arrays!(t, 6, [t, _a, _b, _c, _d, _e]);
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make_arrays!(t, 7, [t, _a, _b, _c, _d, _e, _g]);
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