CODEWITHSUNDEEP
c++volatile
Graeme
Graeme

Reputation: 4592

Can you cast away volatile on a member from a volatile function>

If you have a class member function marked volatile, is it possible to cast away volatile on a class member when it's bein used within that function?

Upvotes: 0

Views: 173

Answers (2)

David Rodríguez - dribeas
David Rodríguez - dribeas

Reputation: 208353

You can cast away volatile from any context by using const_cast. You are asking precisely about casting away inside a volatile member, but that does not make any difference.

The volatile in the function is a check that tells the compiler not to complain if you try to call that method on a volatile object (or through a reference or pointer to volatile object), which is unrelated to the volatile-ness of the members.

What I am trying to say is that if you expect the behavior while accessing data members to be consistent with volatile semantics just because the code is inside a volatile member method, that won't happen.

Upvotes: 0

Sarfaraz Nawaz
Sarfaraz Nawaz

Reputation: 361472

Yes. To cast away the volatile-ness of an object, const_cast is used:

T & t = const_cast<T&>(volatile_t);

This is the way. But whether you should use it in your code or not, I cannot say without looking at the code. In general, casting away the const-ness as well as volatile-ness, is a dangerous idea, and should be done only after very careful examination of all cases.

Upvotes: 4

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