mirror of
https://github.com/matrix-construct/construct
synced 2024-06-25 21:38:18 +02:00
71 lines
1.5 KiB
C++
71 lines
1.5 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_MAYBE_H
|
|
|
|
namespace ircd { inline namespace util
|
|
{
|
|
using maybe_void_type = std::tuple<bool, std::exception_ptr>;
|
|
|
|
template<class function>
|
|
using maybe_retval = typename std::invoke_result<function>::type;
|
|
|
|
template<class function>
|
|
using maybe_type = std::tuple<maybe_retval<function>, std::exception_ptr>;
|
|
|
|
template<class function>
|
|
constexpr bool maybe_void();
|
|
|
|
template<class function>
|
|
typename std::enable_if<!maybe_void<function>(), maybe_type<function>>::type
|
|
maybe(function&& f)
|
|
noexcept try
|
|
{
|
|
return
|
|
{
|
|
f(), std::exception_ptr{}
|
|
};
|
|
}
|
|
catch(...)
|
|
{
|
|
return
|
|
{
|
|
{}, std::current_exception()
|
|
};
|
|
}
|
|
|
|
template<class function>
|
|
typename std::enable_if<maybe_void<function>(), maybe_void_type>::type
|
|
maybe(function&& f)
|
|
noexcept try
|
|
{
|
|
f();
|
|
return
|
|
{
|
|
true, std::exception_ptr{}
|
|
};
|
|
}
|
|
catch(...)
|
|
{
|
|
return
|
|
{
|
|
false, std::current_exception()
|
|
};
|
|
}
|
|
|
|
template<class function>
|
|
constexpr bool
|
|
maybe_void()
|
|
{
|
|
return std::is_same<maybe_retval<function>, void>();
|
|
}
|
|
}}
|