在 Golang 中，如何将接口作为泛型类型与 nil 进行比较

node

comparableT

==!=comparable

type node[T comparable] struct {
    next *node[T]
    leaf T
}

nilTnil

T

var zero T
if n.leaf != zero {
    return n
}

comparable

any*T

anyleafTleaf

type node[T any] struct {
    next *node[T]
    leaf *T
}

func (n *node[T]) GetFirstNodeHasLeaf() *node[T] {
    if n.leaf != nil { // ok, leaf is a pointer type
        return n
    }
...
}

anyT

anyTnode

Tanynil

if !reflect.ValueOf(n.leaf).IsZero() {
    return n
}

TT

// leaf is an interface type
if !reflect.ValueOf(&n.leaf).Elem().IsZero() {
    return n
}