forked from OctaForge/libostd
136 lines
3.8 KiB
C++
136 lines
3.8 KiB
C++
/* Signals/slots for OctaSTD.
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*
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* This file is part of OctaSTD. See COPYING.md for futher information.
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*/
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#ifndef OSTD_SIGNAL_HH
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#define OSTD_SIGNAL_HH
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#include "ostd/functional.hh"
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#include "ostd/utility.hh"
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namespace ostd {
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namespace detail {
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template<typename C, typename ...A>
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struct EventBase {
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EventBase(C *cl): p_class(cl), p_funcs(nullptr), p_nfuncs(0) {}
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EventBase(const EventBase &ev): p_class(ev.p_class),
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p_nfuncs(ev.p_nfuncs) {
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using Func = Function<void(C &, A...)>;
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Func *nbuf = (Func *)new byte[sizeof(Func) * p_nfuncs];
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for (Size i = 0; i < p_nfuncs; ++i)
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new (&nbuf[i]) Func(ev.p_funcs[i]);
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p_funcs = nbuf;
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}
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EventBase(EventBase &&ev): p_class(ev.p_class), p_funcs(ev.p_funcs),
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p_nfuncs(ev.p_nfuncs) {
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ev.p_class = nullptr;
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ev.p_funcs = nullptr;
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ev.p_nfuncs = 0;
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}
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void clear() {
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for (Size i = 0; i < p_nfuncs; ++i)
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p_funcs[i].~Function<void(C &, A...)>();
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delete[] (byte *)p_funcs;
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p_funcs = nullptr;
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p_nfuncs = 0;
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}
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template<typename F>
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Size connect(F &&func) {
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using Func = Function<void(C &, A...)>;
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for (Size i = 0; i < p_nfuncs; ++i)
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if (!p_funcs[i]) {
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p_funcs[i] = forward<F>(func);
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return i;
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}
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Func *nbuf = (Func *)new byte[sizeof(Func) * (p_nfuncs + 1)];
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for (Size i = 0; i < p_nfuncs; ++i) {
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new (&nbuf[i]) Func(move(p_funcs[i]));
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p_funcs[i].~Func();
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}
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new (&nbuf[p_nfuncs]) Func(forward<F>(func));
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delete[] (byte *)p_funcs;
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p_funcs = nbuf;
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return p_nfuncs++;
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}
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bool disconnect(Size idx) {
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if ((idx >= p_nfuncs) || !p_funcs[idx]) return false;
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p_funcs[idx] = nullptr;
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return true;
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}
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template<typename ...Args>
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void emit(Args &&...args) const {
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if (!p_class) return;
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for (Size i = 0; i < p_nfuncs; ++i)
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if (p_funcs[i]) p_funcs[i](*p_class, args...);
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}
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private:
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C *p_class;
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Function<void(C &, A...)> *p_funcs;
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Size p_nfuncs;
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};
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} /* namespace detail */
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template<typename C, typename ...A>
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struct Event {
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private:
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using Base = detail::EventBase<C, A...>;
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Base p_base;
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public:
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Event(C *cl): p_base(cl) {}
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Event(const Event &ev): p_base(ev.p_base) {}
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Event(Event &&ev): p_base(move(ev.p_base)) {}
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~Event() { clear(); }
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void clear() { p_base.clear(); }
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template<typename F>
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Size connect(F &&func) { return p_base.connect(forward<F>(func)); }
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bool disconnect(Size idx) { return p_base.disconnect(idx); }
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template<typename ...Args>
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void emit(Args &&...args) { p_base.emit(forward<Args>(args)...); }
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template<typename ...Args>
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void operator()(Args &&...args) { emit(forward<Args>(args)...); }
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};
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template<typename C, typename ...A>
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struct Event<const C, A...> {
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private:
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using Base = detail::EventBase<const C, A...>;
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Base p_base;
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public:
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Event(C *cl): p_base(cl) {}
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Event(const Event &ev): p_base(ev.p_base) {}
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Event(Event &&ev): p_base(move(ev.p_base)) {}
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~Event() { clear(); }
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void clear() { p_base.clear(); }
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template<typename F>
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Size connect(F &&func) { return p_base.connect(forward<F>(func)); }
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bool disconnect(Size idx) { return p_base.disconnect(idx); }
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template<typename ...Args>
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void emit(Args &&...args) const { p_base.emit(forward<Args>(args)...); }
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template<typename ...Args>
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void operator()(Args &&...args) const { emit(forward<Args>(args)...); }
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};
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} /* namespace ostd */
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#endif |