chords

typedef bool (*InputFunc)(Input const*);

template<InputFunc Function1, InputFunc... Functions>
struct Logic {
    static inline bool conjunction(Input const* input) {
        return Function1(input) && Logic<Functions...>::conjunction(input);
    }
    static inline bool disjunction(Input const* input) {
        return Function1(input) || Logic<Functions...>::disjunction(input);
    }
};

template<InputFunc Function1>
struct Logic<Function1> {
    static inline bool conjunction(Input const* input) {
        return Function1(input);
    }
    static inline bool disjunction(Input const* input) {
        return Function1(input);
    }
};

if (
    Logic<
        Logic<
            Key::pressed<Key::LEFT_CONTROL>,
            Key::wentDown<Key::C>
        >::conjunction,
        Mouse::wentDown<Mouse::RIGHT>
    >::disjunction(&input)
    ) {
    printf("LCtrl + C or right mouse pressed.\n");
}