66 lines
1.6 KiB
C++
66 lines
1.6 KiB
C++
#ifndef CANVAS_SIGNAL_HPP
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#define CANVAS_SIGNAL_HPP
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#include "callable.hpp"
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#include <cstdio>
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#include <vector>
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namespace ce {
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/*! Observer-listener implementation
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*/
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template <class... Args>
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class Signal {
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std::vector<Callable<void, Args...>> listeners{};
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public:
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void connect(Callable<void, Args...> callable);
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void disconnect(Callable<void, Args...> callable);
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void invoke(Args...);
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};
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template <class... Args> void Signal<Args...>::connect(Callable<void, Args...> callable) {
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this->listeners.push_back(callable);
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}
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template <class... Args> void Signal<Args...>::disconnect(Callable<void, Args...> callable) {
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std::erase_if(this->listeners,
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[&callable](Callable<void, Args...> &listener) -> bool {
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return listener == callable;
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});
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}
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template <class... Args> void Signal<Args...>::invoke(Args... args) {
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for(Callable<void, Args...> &listener : this->listeners) {
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listener.call(args...);
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}
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}
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#ifdef DEBUG
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static inline
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void TEST_signals() {
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struct A {inline void f(int val) {
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std::printf("A: %d\n", val);
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}};
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struct B { inline void f(int val) {
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std::printf("B: %d\n", val);
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}};
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A a_object;
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B b_object;
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Signal<int> signal;
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Callable<void, int> a_callable{Callable<void, int>::make(&a_object, &A::f)};
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Callable<void, int> b_callable{Callable<void, int>::make(&b_object, &B::f)};
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signal.connect(a_callable);
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signal.invoke(5);
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signal.connect(b_callable);
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signal.invoke(12);
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signal.disconnect(a_callable);
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signal.invoke(10);
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}
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#endif
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}
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#endif // !CANVAS_SIGNAL_HPP
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