复制构造函数传递的是引用而非指针

//
//  main.cpp
//  复制构造函数
//
//  Created by mac on 2019/4/11.
//  Copyright © 2019年 mac. All rights reserved.
//

#include <iostream>
#include <typeinfo>
#include <type_traits>

class A{
public:
    int a;
    A(int s):a(s){}
    A(A* s):a(s->a){}
    A(const A&) = delete;
};

class B{
public:
    int a;
    B(int s):a(s){}
    B(B* s):a(s->a){}
    B(const B&)=default;
    
};

int main(int argc, const char * argv[]) {
    std::cout<<std::is_copy_constructible<A>::value;
    std::cout<<std::is_copy_constructible<B>::value;
    return 0;
}