C++Primer第五版 12.1.5节练习

#include <iostream>
#include <memory>

using namespace std;

int main()
{
unique_ptr<int> p(new int(10));
unique_ptr<int> p1(p);//非法拷贝
unique_ptr<int> p2;
p2 = p;               //非法赋值
return 0;
}

//编译器内容
[Error] use of deleted function 'std::unique_ptr<_Tp, _Dp>::unique_ptr(const

std::unique_ptr<_Tp, _Dp>&) [with _Tp = int; _Dp =

std::default_delete<int>]'

int ix = 1024, *pi = &ix, *pi2 = new int(2048);
typedef unique_ptr<int> IntP;
(a) IntP p0(ix);   //错误 类型不一致,无法赋值
(b) IntP p1(pi);   //正确 p1指向pi2
(c) IntP p2(pi2);  //正确 p2指向pi2
(d) IntP p3(&ix);  //正确 p3指向ix的地址
(e) IntP p4(new int(2048)); //正确
(f) IntP p5(p2.get()); //正确