194 lines
5.4 KiB
C++
194 lines
5.4 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_EVENT_HH
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#define OSTD_EVENT_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 SignalBase {
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SignalBase(C *cl): p_class(cl), p_funcs(nullptr), p_nfuncs(0) {}
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SignalBase(const SignalBase &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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SignalBase(SignalBase &&ev): p_class(nullptr), p_funcs(nullptr),
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p_nfuncs(0) {
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swap(ev);
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}
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SignalBase &operator=(const SignalBase &ev) {
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using Func = Function<void(C &, A...)>;
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p_class = ev.p_class;
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p_nfuncs = ev.p_nfuncs;
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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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return *this;
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}
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SignalBase &operator=(SignalBase &&ev) {
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swap(ev);
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return *this;
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}
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~SignalBase() { clear(); }
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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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C *get_class() const {
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return p_class;
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}
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C *set_class(C *cl) {
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C *ocl = p_class;
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p_class = cl;
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return ocl;
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}
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void swap(SignalBase &ev) {
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detail::swap_adl(p_class, ev.p_class);
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detail::swap_adl(p_funcs, ev.p_funcs);
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detail::swap_adl(p_nfuncs, ev.p_nfuncs);
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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 Signal {
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private:
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using Base = detail::SignalBase<C, A...>;
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Base p_base;
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public:
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Signal(C *cl): p_base(cl) {}
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Signal(const Signal &ev): p_base(ev.p_base) {}
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Signal(Signal &&ev): p_base(move(ev.p_base)) {}
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Signal &operator=(const Signal &ev) {
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p_base = ev.p_base;
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return *this;
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}
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Signal &operator=(Signal &&ev) {
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p_base = move(ev.p_base);
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return *this;
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}
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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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C *get_class() const { return p_base.get_class(); }
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C *set_class(C *cl) { return p_base.set_class(cl); }
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void swap(Signal &ev) { p_base.swap(ev.p_base); }
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};
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template<typename C, typename ...A>
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struct Signal<const C, A...> {
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private:
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using Base = detail::SignalBase<const C, A...>;
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Base p_base;
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public:
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Signal(C *cl): p_base(cl) {}
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Signal(const Signal &ev): p_base(ev.p_base) {}
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Signal(Signal &&ev): p_base(move(ev.p_base)) {}
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Signal &operator=(const Signal &ev) {
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p_base = ev.p_base;
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return *this;
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}
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Signal &operator=(Signal &&ev) {
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p_base = move(ev.p_base);
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return *this;
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}
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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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C *get_class() const { return p_base.get_class(); }
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C *set_class(C *cl) { return p_base.set_class(cl); }
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void swap(Signal &ev) { p_base.swap(ev.p_base); }
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};
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} /* namespace ostd */
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#endif |