'can c++ class attributes be conditionally compiled

Say I want to make 2 versions of a class - a thread safe version which will use lock guards on all mutating operations, and a 'thread dangerous' one which won't and will presumably run faster in a single-threaded client.

A bit like this:

#include <type_traits>
#include <mutex>

template <bool THREADSAFE>
class wibble {
    private:
    typename std::enable_if<THREADSAFE, std::mutex>::type mtx_;
};

wibble<true> threadsafe; // ok
wibble<false> thread_dangerous; // compiler error

Thanks!

c++enable-if


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