A simple library that lets you compare a value against many values using one operator.

E.g.

x == srp::any_of(1, 2, 3, 4);

is equivalent to:

x == 1 || x == 2 || x == 3 || x == 4;

Besides any_of, library also provides none_of, all_of and one_of. All of them override operator== in an expected way:

x == srp::none_of(1, 2, 3) is equivalent to x != 1 && x != 2 && x != 3 x == srp::all_of(1, 2, 3) is equivalent to x == 1 && x == 2 && x == 3 x == srp::one_of(1, 2, 3) is equivalent to (x == 1) + (x == 2) + (x == 3) == 1

In addition to these functions, you can define your own functions with custom behaviour using srp::make_custom_of. It is a function template taking operator structs defining operators that should be available and return a lambda that can be called just like srp::any_of. Operator struct should define an operator as a friend function. Library provides srp::EqOp that provides operator== and srp::NeqOp that provides operator!=.