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fix: add missing Memoize to readers

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Signed-off-by: Dr. Carsten Leue <carsten.leue@de.ibm.com>
This commit is contained in:
Dr. Carsten Leue
2023-09-20 15:56:02 +02:00
parent 44c8441b07
commit 943ae8e009
8 changed files with 75 additions and 2 deletions
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10
context/readerio/reader.go
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@@ -18,6 +18,7 @@ package readerio
import (
"context"
L "github.com/IBM/fp-go/lazy"
R "github.com/IBM/fp-go/readerio/generic"
)
@@ -54,6 +55,13 @@ func Ask() ReaderIO[context.Context] {
}
// Defer creates an IO by creating a brand new IO via a generator function, each time
func Defer[A any](gen func() ReaderIO[A]) ReaderIO[A] {
func Defer[A any](gen L.Lazy[ReaderIO[A]]) ReaderIO[A] {
return R.Defer[ReaderIO[A]](gen)
}
// Memoize computes the value of the provided [ReaderIO] monad lazily but exactly once
// The context used to compute the value is the context of the first call, so do not use this
// method if the value has a functional dependency on the content of the context
func Memoize[A any](rdr ReaderIO[A]) ReaderIO[A] {
return R.Memoize[ReaderIO[A]](rdr)
}

10
context/readerioeither/generic/reader.go
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@@ -573,3 +573,13 @@ func MonadAlt[LAZY ~func() GEA, GEA ~func(context.Context) GIOA, GIOA ~func() E.
func Alt[LAZY ~func() GEA, GEA ~func(context.Context) GIOA, GIOA ~func() E.Either[error, A], A any](second LAZY) func(GEA) GEA {
return RIE.Alt(second)
}
// Memoize computes the value of the provided monad lazily but exactly once
// The context used to compute the value is the context of the first call, so do not use this
// method if the value has a functional dependency on the content of the context
func Memoize[
GRA ~func(context.Context) GIOA,
GIOA ~func() E.Either[error, A],
A any](rdr GRA) GRA {
return RIE.Memoize[GRA](rdr)
}

7
context/readerioeither/reader.go
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@@ -213,3 +213,10 @@ func MonadAlt[A any](first ReaderIOEither[A], second L.Lazy[ReaderIOEither[A]])
func Alt[A any](second L.Lazy[ReaderIOEither[A]]) func(ReaderIOEither[A]) ReaderIOEither[A] {
return G.Alt(second)
}
// Memoize computes the value of the provided [ReaderIOEither] monad lazily but exactly once
// The context used to compute the value is the context of the first call, so do not use this
// method if the value has a functional dependency on the content of the context
func Memoize[A any](rdr ReaderIOEither[A]) ReaderIOEither[A] {
return G.Memoize[ReaderIOEither[A]](rdr)
}