Input type and return type in generic function

help
1

is it important that the input type as parameter and and return type type in generic function should be same?
is it possible to have a generic function with different input type as parameter and return type ?

2

Yes, it is possible. It sounds like you have a compile error, if you post the error and the related code we can help you fix it.

3

can give a simple example

4 
fn collect_iterator<I, C>(iter: I) -> C
where
    I: IntoIterator,
    C: std::iter::FromIterator
{
    iter.into_iter().collect()
}

This can take anything that can be converted into an iterator and converts it into anything that can be built from an iterator.

Or a simpler example is

fn convert<A: Into<B>, B>(a: A) -> B {
    a.into()
}
1 Like
5

return type may various as usize,isize,char ...

6

I'm not sure what you are trying to ask, do you have a specific question or problem you are trying to solve?

1 Like
7

You can't have functions just generic over numeric types. Generics are based on traits, which are tied to specific methods you run.

See:

8

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