std::enable_shared_from_this<T>::operator=
From cppreference.com
enable_shared_from_this& operator=( const enable_shared_from_this &rhs ) noexcept;
|
(since C++11) | |
Does nothing; returns *this.
Parameters
| rhs | - | another enable_shared_from_this to assign to *this
|
Return value
*this
Notes
weak_this is not affected by the assignment.
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 : public std::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