When to make a type non-movable in C++11?

Question

I was surprised this didn\'t show up in my search results, I thought someone would\'ve asked this before, given the usefulness of move semantics in C++11:

When do I

Answer 1

Actually when I search around, I found quite some types in C++11 are not movable:

• all mutex types(recursive_mutex , timed_mutex, recursive_timed_mutex,
• condition_variable
• type_info
• error_category
• locale::facet
• random_device
• seed_seq
• ios_base
• basic_istream::sentry
• basic_ostream::sentry
• all atomic types
• once_flag

Apparently there is a discussion on Clang: https://groups.google.com/forum/?fromgroups=#!topic/comp.std.c++/pCO1Qqb3Xa4