warning C4141: 'mutable' : used more than once

Hi,

I'm trying to use const correctness as far as possible. To allow member functions which just lock/unlock a mutex and else doing nothing but reading out some information to be const, I usually declare the mutex class members mutable, which works well so far.
Now I had a class with more than one mutex (all decleared mutable) and msvc gives me the warning shown in the topic.

Is there anything to care about for me?

Thank you!

Post the exact code that produces the warning. The description claims it happens when you do

Code:

mutable mutable mutex m_mutex;

Thank you, this was exactly the problem.

Originally Posted by pheres

Thank you, this was exactly the problem.

So wait. The error said "mutable used more than once." And on the line in question, the keyword "mutable" was in fact, used more than once. And this confounded you?

Perhaps it came to pass like this?

Code:

#define mint mutable int

class A
{
    mutable mint b;
};

Originally Posted by anon

Perhaps it came to pass like this?

Code:

#define mint mutable int

class A
{
    mutable mint b;
};

That seems more plausible.

Originally Posted by brewbuck

So wait. The error said "mutable used more than once." And on the line in question, the keyword "mutable" was in fact, used more than once. And this confounded you?

Hehe, yes that was it
The warning showed up in the compile cycle in which I also added another mutable member (and probably messed up the first one with some copy&paste magic). So I mentally charged the new mutable member and didn't try to look on other possible causes. Damn brain.