gistfile1.txt

// In package btree: 
type Comper interface {
	Less(Comper) bool
	Eq(Comper) bool
}

==============================================

type Int int
func (i Int) Less(c btree.Comper) bool {
    a, ok := c.(Int)
    if !ok {
        return false
    }
    return i < a
}
func (i Int) Eq(c btree.Comper) bool {
    a, ok := c.(Int)
    if !ok {
        return false
    }
    return i == a
}