explicit operator bool() const; |
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.
Exceptions
noexcept
specification: noexcept
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
#include <iostream> #include <memory> typedef std::shared_ptr<int> IntPtr; void report(IntPtr ptr) { if (ptr) { std::cout << "*ptr=" << *ptr << "\n"; } else { std::cout << "ptr is not a valid pointer.\n"; } } int main() { IntPtr ptr; report(ptr); ptr = IntPtr(new int(7)); report(ptr); }
Output:
ptr is not a valid pointer. *ptr=7
See also
returns a pointer to the managed object (public member function) |
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