mirror of
https://github.com/matrix-construct/construct
synced 2024-11-27 01:02:46 +01:00
113 lines
3 KiB
C++
113 lines
3 KiB
C++
// Matrix Construct
|
|
//
|
|
// Copyright (C) Matrix Construct Developers, Authors & Contributors
|
|
// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
|
|
//
|
|
// Permission to use, copy, modify, and/or distribute this software for any
|
|
// purpose with or without fee is hereby granted, provided that the above
|
|
// copyright notice and this permission notice is present in all copies. The
|
|
// full license for this software is available in the LICENSE file.
|
|
|
|
#pragma once
|
|
#define HAVE_IRCD_UTIL_CALLBACKS_H
|
|
|
|
namespace ircd {
|
|
inline namespace util
|
|
{
|
|
/// The purpose of callbacks is simply explained with an analogy out of
|
|
/// browser-javascript land: it is window.onload.addEventListener() in lieu
|
|
/// of assigning window.onload = function(). This is a list of multiple
|
|
/// callbacks listening for invocation. The listener is responsible for
|
|
/// both adding and removing itself using the std list interface.
|
|
///
|
|
/// The template provides an option for whether exceptions should propagate
|
|
/// to the caller. If they propagate, all listeners after the exception won't
|
|
/// be invoked.
|
|
///
|
|
template<class prototype,
|
|
bool exceptions = true>
|
|
struct callbacks;
|
|
|
|
template<class prototype>
|
|
struct callbacks<prototype, true>;
|
|
|
|
template<class prototype>
|
|
struct callbacks<prototype, false>;
|
|
}}
|
|
|
|
template<class prototype>
|
|
struct ircd::util::callbacks<prototype, true>
|
|
:std::list<std::function<prototype>>
|
|
{
|
|
struct callback;
|
|
using proto_type = prototype;
|
|
using list_type = std::list<std::function<prototype>>;
|
|
|
|
template<class... args>
|
|
void operator()(args&&... a) const
|
|
{
|
|
for(const auto &func : *this)
|
|
func(std::forward<args>(a)...);
|
|
}
|
|
|
|
callbacks() = default;
|
|
callbacks(callbacks &&) = default;
|
|
callbacks(const callbacks &) = delete;
|
|
callbacks &operator=(callbacks &&) = default;
|
|
callbacks &operator=(const callbacks &) = delete;
|
|
};
|
|
|
|
template<class prototype>
|
|
struct ircd::util::callbacks<prototype, false>
|
|
:std::list<std::function<prototype>>
|
|
{
|
|
struct callback;
|
|
using proto_type = prototype;
|
|
using list_type = std::list<std::function<prototype>>;
|
|
|
|
template<class... args>
|
|
void operator()(args&&... a) const
|
|
{
|
|
for(const auto &func : *this) try
|
|
{
|
|
func(std::forward<args>(a)...);
|
|
}
|
|
catch(const std::exception &e)
|
|
{
|
|
// Logging isn't available in ircd::util;
|
|
// just silently drop and continue.
|
|
}
|
|
}
|
|
|
|
callbacks() = default;
|
|
callbacks(callbacks &&) = default;
|
|
callbacks(const callbacks &) = delete;
|
|
callbacks &operator=(callbacks &&) = default;
|
|
callbacks &operator=(const callbacks &) = delete;
|
|
};
|
|
|
|
template<class prototype>
|
|
struct ircd::util::callbacks<prototype, true>::callback
|
|
:util::unique_iterator<list_type>
|
|
{
|
|
template<class function>
|
|
callback(callbacks &c, function&& f)
|
|
:util::unique_iterator<list_type>
|
|
{
|
|
c, c.emplace(end(c), std::forward<function>(f))
|
|
}
|
|
{}
|
|
};
|
|
|
|
template<class prototype>
|
|
struct ircd::util::callbacks<prototype, false>::callback
|
|
:util::unique_iterator<list_type>
|
|
{
|
|
template<class function>
|
|
callback(callbacks &c, function&& f)
|
|
:util::unique_iterator<list_type>
|
|
{
|
|
c, c.emplace(end(c), std::forward<function>(f))
|
|
}
|
|
{}
|
|
};
|