Compare two instances of
std::thread::id to see if one lies before
the other in the total ordering of thread ID values.
bool operator<( std::thread::id lhs,std::thread::id rhs);
true if the value
before the value of
in the total ordering of thread ID values. If
then exactly one of
and the other returns
rhs<lhs both return
The singular not a thread value held by
std::thread::id instance compares
less than any
std::thread::id instance that represents
a thread of execution. If two instances of
std::thread::id are equal, neither
is less than the other. Any set of distinct
std::thread::id values forms a total
order which is consistent throughout an execution of a program.
This order may vary between executions of the same program.