from functools import wraps
from flask import g, redirect, url_for,flash

def login_required(func):
    # 保留func的信息
    @wraps(func)
    # func(a,b,c)
    # func(1,2,c=3)
    def inner(*args, **kwargs):
        if g.user:
            return func(*args, **kwargs)
        else:
            flash('请先登录或者注册')
            return redirect(url_for("display.login"))
    return inner

# @login_required
# def public_question(quesiton_id):
#     pass
#
# login_required(public_question)(question_id)