Compare two instances of std::thread::id to see if they represent
the same thread of execution.
bool operator==( std::thread::id lhs,std::thread::id rhs);
true if both lhs and rhs
represent the same thread of execution, or both have the singular
not a thread value. false
if lhs and rhs represent different threads
of execution, or one represents a thread of execution and the
other has the singular not a thread value.
Nothing
#include <thread>