Support two value factory methods: FromNillable() and PtrFromNillable()
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…ble()`
These methods accept the nillable pointer value as an argument and make
the `Optional[T]` type value.
`FromNillable()`
----
If the given value is not nil, this returns Some[T] value with doing
value-dereference.
On the other hand, if the value is nil, this returns None[T].
example:
```go
num := 123
some := FromNillable[int](&num)
fmt.Printf("%v\n", some.IsSome()) // => true
fmt.Printf("%v\n", some.Unwrap()) // => 123
none := FromNillable[int](nil)
fmt.Printf("%v\n", none.IsSome()) // => false
fmt.Printf("%v\n", none.Unwrap()) // => 0 (the default value of int)
```
`PtrFromNillable()`
----
If the given value is not nil, this returns Some[*T] value **without**
doing value-dereference.
On the other hand, if the value is nil, this returns None[*T].
example:
```go
num := 123
some := PtrFromNillable[int](&num)
fmt.Printf("%v\n", some.IsSome()) // => true
fmt.Printf("%v\n", *some.Unwrap()) // => 123 (NOTE: it needs doing dereference)
none := PtrFromNillable[int](nil)
fmt.Printf("%v\n", none.IsSome()) // => false
fmt.Printf("%v\n", none.Unwrap()) // => nil
```
Signed-off-by: moznion <moznion@mail.moznion.net>
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These methods accept the nillable pointer value as an argument and make the
Optional[T]type value.FromNillable()If the given value is not nil, this returns
Some[T]value with doing value-dereference.On the other hand, if the value is nil, this returns
None[T].example:
PtrFromNillable()If the given value is not nil, this returns
Some[*T]value without doing value-dereference.On the other hand, if the value is nil, this returns
None[*T].example: