mirror of
https://github.com/matrix-construct/construct
synced 2024-11-16 06:51:08 +01:00
70 lines
1.5 KiB
C++
70 lines
1.5 KiB
C++
// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2019 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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#pragma once
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#define HAVE_IRCD_UTIL_MAYBE_H
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namespace ircd { inline namespace util
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{
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using maybe_void_type = std::tuple<bool, std::exception_ptr>;
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template<class function>
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using maybe_retval = typename std::invoke_result<function>::type;
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template<class function>
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using maybe_type = std::tuple<maybe_retval<function>, std::exception_ptr>;
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template<class function>
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constexpr bool maybe_void();
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template<class function>
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typename std::enable_if<!maybe_void<function>(), maybe_type<function>>::type
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maybe(function&& f)
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noexcept try
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{
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return
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{
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f(), std::exception_ptr{}
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};
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}
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catch(...)
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{
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return
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{
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{}, std::current_exception()
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};
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}
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template<class function>
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typename std::enable_if<maybe_void<function>(), maybe_void_type>::type
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maybe(function&& f)
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noexcept try
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{
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f();
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return
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{
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true, std::exception_ptr{}
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};
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}
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catch(...)
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{
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return
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{
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false, std::current_exception()
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};
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}
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template<class function>
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constexpr bool
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maybe_void()
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{
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return std::is_same<maybe_retval<function>, void>();
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}
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}}
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