NAME¶

std::shared_ptr::operatorbool - std::shared_ptr::operatorbool

Synopsis¶

explicit operator bool() const noexcept;

Checks if *this stores a non-null pointer, i.e. whether get() != nullptr.

Parameters¶

(none)

Return value¶

true if *this stores a pointer, false otherwise.

Notes¶

An empty shared_ptr (where use_count() == 0) may store a non-null pointer accessible
by get(), e.g. if it were created using the aliasing constructor.

Example¶

// Run this code

#include <iostream>
#include <memory>

void report(std::shared_ptr<int> ptr)
{
if (ptr) {
std::cout << "*ptr=" << *ptr << "\n";
} else {
std::cout << "ptr is not a valid pointer.\n";
}
}

int main()
{
std::shared_ptr<int> ptr;
report(ptr);

ptr = std::make_shared<int>(7);
report(ptr);
}

Output:¶

ptr is not a valid pointer.
*ptr=7

See also¶

get returns the stored pointer
(public member function)