std::shared_ptr::use_count
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<metanoindex/>
<tbody> </tbody> long use_count() const; |
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Returns the number of different shared_ptr instances (this included) managing the current object. If there is no managed object, 0 is returned.
Parameter
(None)
Original:
(none)
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Rückgabewert
the number of shared_ptr instances managing the current object or 0 if there is no managed object.
Beispiel
#include <memory>
#include <iostream>
void fun(std::shared_ptr<int> sp)
{
std::cout << "fun: sp.use_count() == " << sp.use_count() << std::endl;
}
int main()
{
std::shared_ptr<int> sp1 {std::make_shared<int>(5)};
std::cout << "sp1.use_count() == " << sp1.use_count() << std::endl;
fun(sp1);
}
Output:
sp1.use_count() == 1
fun: sp.use_count() == 2