72 lines
1.5 KiB
Rust
72 lines
1.5 KiB
Rust
use crate::func::*;
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pub struct SoloClass;
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impl WeakFunctor for SoloClass {
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type F<'a, A> = A;
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}
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impl Functor for SoloClass {
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fn fmap<'a, A: 'a, B: 'a, F: 'a + FnOnce(A) -> B>(f: F, fa: Self::F<'a, A>) -> Self::F<'a, B> {
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f(fa)
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}
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fn replace<'a, A: 'a, B: 'a>(fa: Self::F<'a, A>, b: B) -> Self::F<'a, B> {
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drop(fa);
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b
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}
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fn void<'a, A: 'a>(fa: Self::F<'a, A>) -> Self::F<'a, ()> {
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drop(fa);
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}
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}
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impl ApplicativeSeq for SoloClass {
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fn seq<'a, A: 'a, B: 'a, F: 'a + FnOnce(A) -> B>(
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ff: Self::F<'a, F>,
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fa: Self::F<'a, A>,
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) -> Self::F<'a, B> {
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ff(fa)
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}
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}
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impl ApplicativeLA2 for SoloClass {
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fn la2<'a, A: 'a, B: 'a, C: 'a, F: 'a + FnOnce(A, B) -> C>(
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f: F,
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fa: Self::F<'a, A>,
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fb: Self::F<'a, B>,
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) -> Self::F<'a, C> {
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f(fa, fb)
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}
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}
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impl Applicative for SoloClass {
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fn pure<'a, A: 'a>(a: A) -> Self::F<'a, A> {
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a
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}
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fn discard_first<'a, A: 'a, B: 'a>(fa: Self::F<'a, A>, fb: Self::F<'a, B>) -> Self::F<'a, B> {
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drop(fa);
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fb
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}
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fn discard_second<'a, A: 'a, B: 'a>(fa: Self::F<'a, A>, fb: Self::F<'a, B>) -> Self::F<'a, A> {
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drop(fb);
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fa
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}
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}
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impl Monad for SoloClass {
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fn bind<'a, A: 'a, B: 'a, F: 'a + FnOnce(A) -> Self::F<'a, B>>(
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fa: Self::F<'a, A>,
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f: F,
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) -> Self::F<'a, B> {
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f(fa)
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}
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fn join<'a, A: 'a>(ffa: Self::F<'a, Self::F<'a, A>>) -> Self::F<'a, A>
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{
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ffa
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}
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}
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