std::enable_shared_from_this<T>::operator=
enable_shared_from_this<T>& operator=( const enable_shared_from_this<T> &obj ) noexcept;
Does nothing; returns *this
.
Parameters
obj
- an enable_shared_from_this to assign to *this
Return value
*this
Notes
The private std::weak_ptr<T>
member is not affected by this assignment operator.
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.
#include <memory>
#include <iostream>
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() << std::endl;
}
Result
4