dispatcher.h

#pragma once
#include <functional>
 
namespace asyncpp {
    class dispatcher {
#if defined(ASYNCPP_SO_COMPAT)
        static thread_local dispatcher* g_current_dispatcher;
#else
        static thread_local inline dispatcher* g_current_dispatcher = nullptr;
#endif
 
    protected:
        ~dispatcher() = default;
 
        static dispatcher* current(dispatcher* disp) {
            const auto old = g_current_dispatcher;
            g_current_dispatcher = disp;
            return old;
        }
 
    public:
        virtual void push(std::function<void()> cbfn) = 0;
        static dispatcher* current() noexcept { return g_current_dispatcher; }
    };
 
#if defined(ASYNCPP_SO_COMPAT_IMPL)
    thread_local dispatcher* dispatcher::g_current_dispatcher = nullptr;
#endif
} // namespace asyncpp