Always declare std::mutex as mutable in C++11?

Question

After watching Herb Sutter\'s talk You Don\'t Know const and mutable, I wonder whether I should always define a mutex as mutable? If yes, I guess the same holds for any sync

Answer 1

The accepted answer covers the question, but it's worth mentioning that Sutter has since changed the slide that incorrectly suggested that const == mutable == thread-safe. The blog post that lead to that slide change can be found here:

What Sutter got wrong about Const in C++11

TL:DR Const and Mutable both imply Thread-safe, but have different meanings in regards to what can and can't be changed in your program.