check if shared pointer is null

At the moment, I am using a null-check to decide whether the static local s...

At the moment, I am using a null-check to decide whether the static local shared_ptr should be initialised or merely copied. I fear that this test will not work to.

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You can just test the pointer as a boolean: it will evaluate to true if it ...

You can just test the pointer as a boolean: it will evaluate to true if it is non-null boost::shared_ptr and std::trshared_ptr both implement the.

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Yes, you are testing it correctly. Your problem, however, is likely caused ...

Yes, you are testing it correctly. Your problem, however, is likely caused by dereferencing an invalid iterator. Check that returnsAnIterator().

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Indeed, the assertion wants a pointer to check if it's null, but a sma...

Indeed, the assertion wants a pointer to check if it's null, but a smart-pointer isn't a pointer strictly speaking (it's an object that manages a.

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Is there a difference between doing std::shared_ptr p; if (!p) { // method ...

Is there a difference between doing std::shared_ptr p; if (!p) { // method 1 } if (p == nullptr) { // method 2 }. No, there's no difference. Either of.

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Or if it does not, how is the NULL ity of the a_sp checked? Is there some f...

Or if it does not, how is the NULL ity of the a_sp checked? Is there some function in shared_ptr defined that converts it to boolean value?

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If you don't convert weak_ptr into shared_ptr, your weak_ptr may expir...

If you don't convert weak_ptr into shared_ptr, your weak_ptr may expire shared_ptr, you must check that it isn't null, because weak_ptr may.

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Does a non-empty null shared_ptr even make sense? Would there ever be a cas...

Does a non-empty null shared_ptr even make sense? Would there ever be a case in normal usage (i.e. if you didn't explicitly construct one).

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If it's a null-valued pointer to MyToy, then it leaves the shared_ptr ...

If it's a null-valued pointer to MyToy, then it leaves the shared_ptr How can I check if a smart pointer is "empty" (for instance, dwn.220.v.ua()).

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Speaking generally, you can check the pointer's value. You just have t...

Speaking generally, you can check the pointer's value. You just have to get at the underlying representation because, as you've discovered.

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template < typename T>. class shared_ptr. { // bool operator=...

template < typename T>. class shared_ptr. { // bool operator==(T *p) const // compare against T* and check for equality. {. if (px_ == p).

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An empty shared_ptr (where use_count() == 0) may store a non-null pointer a...

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.

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If I've got a function which returns a smart pointer (more specificall...

If I've got a function which returns a smart pointer (more specifically a share_ptr) and a want set/check it for a NULL value how do I do it.

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comparison with ​0​. If use_count returns zero, the shared pointer is empty...

comparison with ​0​. If use_count returns zero, the shared pointer is empty and manages no objects (whether or not its stored pointer is null).

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A shared_ptr may also own no objects, in which case it is called empty (an ...

A shared_ptr may also own no objects, in which case it is called empty (an empty shared_ptr may have a non-null stored pointer if the aliasing.

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