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std::shared_ptr<T>:: get

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std::shared_ptr
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shared_ptr::get
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T * get ( ) const noexcept ;
(C++17 前)
element_type * get ( ) const noexcept ;
(C++17 起)

返回存储的指针。

目录

参数

(无)

返回值

存储的指针。

注释

一个 shared_ptr 可以在共享对象所有权的同时存储指向另一个对象的指针。 get() 返回的是存储的指针，而非托管的指针。

示例

运行此代码 
#include <iostream>
#include <memory>
#include <string_view>
int main()
{
    auto output = [](std::string_view msg, int const* pInt)
    {
        std::cout << msg << *pInt << " in " << pInt << '\n';
    };
    int* pInt = new int(42);
    std::shared_ptr<int> pShared = std::make_shared<int>(42);
    output("Naked pointer: ", pInt);
//  output("Shared pointer: ", pShared); // 编译器错误
    output("Shared pointer: ", &*pShared); // 正确，先调用 operator*，然后取地址
    output("Shared pointer with get(): ", pShared.get());
    delete pInt;
    std::cout << "\nThe shared_ptr's aliasing constructor demo.\n";
    struct Base1 { int i1{}; };
    struct Base2 { int i2{}; };
    struct Derived : Base1, Base2 { int i3{}; };
    std::shared_ptr<Derived> p(new Derived());
    std::shared_ptr<Base2> q(p, static_cast<Base2*>(p.get()));
    std::cout << "q shares ownership with p, but points to Base2 subobject:\n"
              << "p.get(): " << p.get() << '\n'
              << "q.get(): " << q.get() << '\n'
              << "&(p->i1): " << &(p->i1) << '\n'
              << "&(p->i2): " << &(p->i2) << '\n'
              << "&(p->i3): " << &(p->i3) << '\n'
              << "&(q->i2): " << &(q->i2) << '\n';
}

可能的输出： 

Naked pointer: 42 in 0xacac20
Shared pointer: 42 in 0xacac50
Shared pointer with get(): 42 in 0xacac50
The shared_ptr's aliasing constructor demo.
q shares ownership with p, but points to Base2 subobject:
p.get(): 0xacac20
q.get(): 0xacac24
&(p->i1): 0xacac20
&(p->i2): 0xacac24
&(p->i3): 0xacac28
&(q->i2): 0xacac24

参见

解引用存储的指针
(公开成员函数)