std::enable_shared_from_this<T>::operator=
From cppreference.com
< cpp | memory | enable shared from this
enable_shared_from_this& operator=(const enable_shared_from_this &rhs )noexcept; | (since C++11) | |
Does nothing; returns *this.
Contents |
[edit]Parameters
| rhs | - | another enable_shared_from_this to assign to *this |
[edit]Return value
*this
[edit]Notes
weak_this is not affected by the assignment.
[edit]Example
Note: enable_shared_from_this::operator= is defined as protected in order to prevent accidental slicing but allow derived classes to have default assignment operators.
Run this code
#include <iostream>#include <memory> class SharedInt :publicstd::enable_shared_from_this<SharedInt>{public:explicit SharedInt(int n): mNumber(n){} SharedInt(const SharedInt&)=default; SharedInt(SharedInt&&)=default; ~SharedInt()=default; // Both assignment operators use enable_shared_from_this::operator= SharedInt& operator=(const SharedInt&)=default; SharedInt& operator=(SharedInt&&)=default; int number()const{return mNumber;} private:int mNumber;}; int main(){std::shared_ptr<SharedInt> a =std::make_shared<SharedInt>(2);std::shared_ptr<SharedInt> b =std::make_shared<SharedInt>(4);*a =*b; std::cout<< a->number()<<'\n';}
Output:
4
[edit]See also
(C++11) | smart pointer with shared object ownership semantics (class template) |
