go语法入门泛型type parameters简称T(类型形参)两种场景使用

// maxInt64 获取j，j中的最大值
func maxInt64(i, j int64) int64 {
    if i >= j {
        return i
    }
    return j
}
// maxInt32 获取j，j中的最大值
func maxInt32(i, j int32) int32 {
    if i >= j {
        return i
    }
    return j
}

maxInt64(i, j int64) int64
maxInt32(i, j int32) int32

func maxInt32orInt62[T int32 | int64](i, j T) T {
    if i >= j {
        return i
    }
    return j
}
func TestMaxInt32orInt62(t *testing.T) {
    var i1, j1 int32 = 1, 3
    t.Log(maxInt32orInt62(i1, j1))
    var i2, j2 int64 = 11, 3
    t.Log(maxInt32orInt62(i2, j2))
}

[T int32 | int64]

type sumInt struct {
    Num int64
}
func (s sumInt) Sum() int64 {
    return s.Num
}
type sumFloat struct {
    Num float64
}
func (s sumFloat) Sum() float64 {
    return s.Num
}
func TestSumIntOrFloat(t *testing.T) {
    i := sumInt{Num: 100}
    t.Log(i.Sum())
    f := sumFloat{Num: 100.0}
    t.Log(f.Sum())
}

type sumIntOrFloat[T int64 | float64] struct {
    Num T
}
func (s sumIntOrFloat[T]) Sum() T {
    return s.Num
}
func TestSumIntOrFloat(t *testing.T) {
    i := sumIntOrFloat[int64]{Num: 100}
    t.Log(i.Sum())
    f := sumIntOrFloat[float64]{Num: 100.0}
    t.Log(f.Sum())
}