Home - News ( United States | United Kingdom | Italy | Germany ) - Football scores

Showing content from https://en.cppreference.com/w/cpp/language/../memory/shared_ptr/get.html below:

std::shared_ptr<T>::get - cppreference.com

T* get() const noexcept;

element_type* get() const noexcept;

Returns the stored pointer.

(none)

The stored pointer.

A shared_ptr may share ownership of an object while storing a pointer to another object. get() returns the stored pointer, not the managed pointer.

#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); // compiler error
    output("Shared pointer: ", &*pShared); // OK, calls operator*, then takes addr
    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';
}

Possible output:

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

RetroSearch is an open source project built by @garambo | Open a GitHub Issue

Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo

HTML: 3.2 | Encoding: UTF-8 | Version: 0.7.4