go impl for https://docs.rs/anyhow/latest/anyhow/
go get github.com/chyroc/anyhow- result struct
Result1[T]Result2[T1, T2]Result3[T1, T2, T3]Result4[T1, T2, T3, T4]Result5[T1, T2, T3, T4, T5]Result6[T1, T2, T3, T4, T5, T6]
- functions:
And(self R[T], res R[U]) R[U]: Returns res if the result is Ok, otherwise returns the Err value of selfAndThen(self R[T], op (T) -> R[U]) R[U]: Calls op if the result is Ok, otherwise returns the Err value of selfMap(self R[T], op (T) -> U) R[U]: Maps a Result to Result by applying a function to a contained Ok value, leaving an Err value untouchedMapOr(self R[T], default U, op func(T) U) U: Returns the provided default (if Err), or applies a function to the contained value (if Ok)
- methods:
(R[T]) IntoErr() error: Returns the contained Err value, but never panics(R[T]) IntoOk() T1: Returns the contained Ok value, but never panics(R[T]) Expect(string) T: Returns the contained Ok value, otherwise panics with a panic message including the passed message, and the content of the Err(R[T]) ExpectErr(string) error: Returns the contained Err value, otherwise panics with a panic message including the passed message, and the content of the Ok(R[T]) Inspect(f (T) -> void) R[T]: Calls a function with a reference to the contained value if Ok(R[T]) InspectErr(f (error) -> void) R[T]: Calls a function with a reference to the contained value if Err(R[T]) MapErr(op func(error) error) R[T]: Maps a R[T] to R[T] by applying a function to a contained Err value, leaving an Ok value untouched(R[T]) IsErr() bool: Returns true if the result is Err(R[T]) IsOk() bool: Returns true if the result is Ok(R[T]) Or(res R[T]) R[T]: Returns res if the result is Err, otherwise returns the Ok value of self(R[T]) OrElse(op (error) -> R[T]) R[T]: Calls op if the result is Err, otherwise returns the Ok value of self(R[T]) Unwrap() T: Returns the contained Ok value, otherwise panics with Err(R[T]) UnwrapOr(default T) T: Returns the contained Ok value or a provided default(R[T]) UnwrapOrDefault() T: Returns the contained Ok value or a default value(R[T]) UnwrapOrElse(op (error) -> T) T: Returns the contained Ok value or computes it from a closure
package main
import (
"log"
"os/user"
. "github.com/chyroc/anyhow"
)
func getHomePath() Result1[string] {
user, err := user.Current()
if err != nil {
return Err1[string](err)
}
return Ok1(user.HomeDir)
}
func Example_AndThen_UnwrapOr() {
// get home path, and then get log path, or use /tmp/log
_ = AndThen11(getHomePath(), func(t1 string) Result1[string] {
return Ok1(t1 + "/.log")
}).UnwrapOr("/tmp/log")
}
func Example_Inspect_InspectErr() {
// get home path, log it, or log error
_ = getHomePath().Inspect(func(t1 string) {
log.Println("home:", t1)
}).InspectErr(func(err error) {
log.Println("error:", err)
}).UnwrapOr("/tmp/log")
}
func Example_Expect_ExpectErr() {
// get home path, or panic with `must get home` msg
_ = getHomePath().Expect("must get home")
// get home path with err, or panic with `must get err` msg
_ = getHomePath().ExpectErr("must get err")
}