go 用slice模拟vector功能

appendVector

a = append(a, b...)

copy

b = append([]T(nil), a...)

b = make([]T, len(a))
copy(b, a)

cut删除一段范围i~j

copy(a[i:], a[j:])
for k, n := len(a) - j + i, len(a); k < n; k++ {
a[k] = nil //or the zero value of T
}
a = a[:len(a) - j + i]

delete删除指定i

copy(a[i:], a[i+1:]
a[len(a] - 1] = nil //or zero value of T
a = a[:len(a)-1]

expand 在i位置扩展j个位置出来

a = append(a[:i], append(make([]T, j), a[i:]...)...)

extend 在最后扩展j个位置

a = append(a, make([]T, j)...)

insert 在i位置插入

a = append(a[:i], append([]T{x}, a[i:]...)...)

a = append(a, nil)//or zero value of T
copy(a[i+1:], a[i:])
a[i] = x

insertVector 插入vector b

a = append(a[:i], append(b, a[i:]...)...)

pop

x, a = a[len(a)-1], a[:len(a)-1]

push

a = append(a, x)

shift

x, a := a[0], a[i:]

unshift

a = append([]T{x}, a...)

filter

b := a[:0]
for _, x := range a {
if f(x) {
b = append(b, x)
}
}

reversing

for left, right := 0, len(a) - 1; left < right; left, right = left - 1, right - 1 {
a[left], a[right] = a[right], a[left]
}