Add explicit to single-parameter constructors #28
Description
Describe the new feature
Can we add explicit to single-parameter constructors to avoid unintended implicit construct?
Code example
explicit thread_pool(const ui32 &_thread_count = std::thread::hardware_concurrency())
: thread_count(_thread_count ? _thread_count : std::thread::hardware_concurrency()), threads(new std::thread[thread_count]);
// ...
explicit synced_stream(std::ostream &_out_stream = std::cout);