E1776 无法引用 函数 "A::A(const A&)" (已隐式声明) -- 它是已删除的函数:https://blog.csdn.net/Bit_Coders/article/details/117260363
>>c++拷贝构造函数(深拷贝,浅拷贝)详解:https://www.gxlsystem.com/bianchengyuyan-416455.html
标签:函数,删除,引用,https,无法,拷贝 From: https://www.cnblogs.com/2008nmj/p/17741323.html