Go泛型Generics

泛型函数

type Num interface {
    ~int | ~int8 | ~int16 | ~int32 | ~int64 |
    ~uint | ~uint8 | ~uint16 | ~uint32 | ~uint64 | 
    ~float32 | ~float64
}

func Sum[T Num](m []T) T {
    var s T
    for _, v := range m {
        s += v
    }
    return s
}

泛型类, 用栈打个比方

type Stack[T any] []T

func NewStack[T any]() *Stack[T] {
    return &Stack[T]{}
}

func (s *Stack[T]) Push(val T) {
    *s = append(*s, val)
}

func (s *Stack[T]) Pop() (val T) {
    if s.Empty() {
        return
    }
    i := len(*s) - 1
    val = (*s)[i]
    *s = (*s)[:i]
    return
}

func (s *Stack[T]) Empty() bool {
    return len(*s) == 0
}

func (s *Stack[T]) Peek() T {
    return (*s)[len(*s) - 1]
}