25     size_t key;  member
33         return a.key < b.key;  in operator ()()
38         return a.key < key;  in operator <()
43         return a.key <= key;  in operator >=()
48         return a.key >= key;  in operator <=()
53         return a.key == key;  in operator ==()
58         return a.key == key;  in operator ==()
63         return a.key != key;  in operator !=()
68         tmp.key = !key;  in operator !()
74         stream << a.key;  in operator <<()
78     UserType() : key(-1), f(0.0f), d(0.0), i(0) {}  in UserType()
79     UserType(size_t Number) : key(Number), f(0.0f), d(0.0), i(0) {}  in UserType()
83         key = other.key;  in operator =()
86     UserType(const UserType& other) : key(other.key), f(other.f), d(other.d), i(other.i) {}  in UserType()
87     UserType(UserType&& other) : key(other.key), f(other.f), d(other.d), i(other.i)  in UserType()
89         other.key = -1;  in UserType()