package util

import (
	"io"
	"os"
)

// Return a slice of range [0, n)
func Range(n int) []int {
	s := make([]int, n)
	for i := 0; i < n; i++ {
		s[i] = i
	}
	return s
}

func CopyFile(srcPath, dstPath string) error {
	fin, err := os.Open(srcPath)
	if err != nil {
		return err
	}
	defer fin.Close()

	fout, err := os.Create(dstPath)
	if err != nil {
		return err
	}
	defer fout.Close()

	_, err = io.Copy(fout, fin)
	return err
}