mirror of
https://github.com/matrix-construct/construct
synced 2024-07-05 10:08:36 +02:00
84 lines
2 KiB
C++
84 lines
2 KiB
C++
// Matrix Construct
|
|
//
|
|
// Copyright (C) Matrix Construct Developers, Authors & Contributors
|
|
// Copyright (C) 2016-2019 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_CLOSURE_H
|
|
|
|
namespace ircd {
|
|
inline namespace util
|
|
{
|
|
template<template<class, class...>
|
|
class F,
|
|
class R,
|
|
class... A>
|
|
struct closure;
|
|
|
|
template<template<class, class...>
|
|
class F,
|
|
class... A>
|
|
struct closure<F, bool, A...>;
|
|
|
|
/// Template for creating callback-based iterations allowing closures of
|
|
/// either `void (...)` or `bool (...)` to be passed to the same overload.
|
|
///
|
|
/// This reduces/deduplicates interfaces which offer an overload for each
|
|
/// and thus two library symbols, usually just calling each other...
|
|
///
|
|
template<template<class, class...>
|
|
class F,
|
|
class... A>
|
|
using closure_bool = closure<F, bool, A...>;
|
|
}}
|
|
|
|
template<template<class, class...>
|
|
class F,
|
|
class R,
|
|
class... A>
|
|
struct ircd::util::closure
|
|
:F<R (A...)>
|
|
{
|
|
using proto_type = R (A...);
|
|
using func_type = F<proto_type>;
|
|
|
|
using func_type::func_type;
|
|
using func_type::operator=;
|
|
};
|
|
|
|
template<template<class, class...>
|
|
class F,
|
|
class... A>
|
|
struct ircd::util::closure<F, bool, A...>
|
|
:F<bool (A...)>
|
|
{
|
|
using proto_type = bool (A...);
|
|
using func_type = F<proto_type>;
|
|
|
|
template<class lambda>
|
|
closure(lambda &&o) noexcept;
|
|
};
|
|
|
|
template<template<class, class...>
|
|
class F,
|
|
class... A>
|
|
template<class lambda>
|
|
[[gnu::always_inline]]
|
|
inline
|
|
ircd::util::closure<F, bool, A...>::closure(lambda &&o)
|
|
noexcept
|
|
:F<bool (A...)>
|
|
{
|
|
[o(std::move(o))](A&&... a)
|
|
{
|
|
o(std::forward<A>(a)...);
|
|
return true;
|
|
}
|
|
}
|
|
{}
|