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std::unique_ptr<T,Deleter>:: get

From cppreference.net
C++
Memory management library
( exposition only* )
Allocators
Uninitialized memory algorithms
Constrained uninitialized memory algorithms
Memory resources
Uninitialized storage (until C++20)
( until C++20* )
( until C++20* )
( until C++20* )

Garbage collector support (until C++23)
(C++11) (until C++23)
(C++11) (until C++23)
(C++11) (until C++23)
(C++11) (until C++23)
(C++11) (until C++23)
(C++11) (until C++23)
std::unique_ptr
pointer get ( ) const noexcept ;
(自 C++11 起)
(自 C++23 起为 constexpr)

返回指向被管理对象的指针，若未持有任何对象则返回 nullptr 。

目录

参数

(无)

返回值

指向被管理对象的指针，如果未拥有对象则为 nullptr 。

示例

运行此代码 
#include <iomanip>
#include <iostream>
#include <memory>
#include <string>
#include <utility>
class Res
{
    std::string s;
public:
    Res(std::string arg) : s{std::move(arg)}
    {
        std::cout << "Res::Res(" << std::quoted(s) << ");\n";
    }
    ~Res()
    {
        std::cout << "Res::~Res();\n";
    }
private:
    friend std::ostream& operator<<(std::ostream& os, Res const& r)
    {
        return os << "Res { s = " << std::quoted(r.s) << "; }";
    }
};
int main()
{
    std::unique_ptr<Res> up(new Res{"Hello, world!"});
    Res* res = up.get();
    std::cout << *res << '\n';
}

输出： 

Res::Res("Hello, world!");
Res { s = "Hello, world!"; }
Res::~Res();

参见

返回指向被管理对象的指针并释放所有权
(公开成员函数)