mirror of
https://github.com/matrix-construct/construct
synced 2024-06-30 07:48:22 +02:00
41 lines
1.1 KiB
C++
41 lines
1.1 KiB
C++
// The Construct
|
|
//
|
|
// Copyright (C) The Construct Developers, Authors & Contributors
|
|
// Copyright (C) 2016-2020 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_MASK_H
|
|
|
|
namespace ircd {
|
|
inline namespace util
|
|
{
|
|
template<class T> T popmask(const T) noexcept;
|
|
template<class T> T boolmask(const T) noexcept;
|
|
}}
|
|
|
|
/// Convenience template. Extends a bool value where the lsb is 1 or 0 into a
|
|
/// mask value like the result of vector comparisons.
|
|
template<class T>
|
|
inline T
|
|
ircd::util::boolmask(const T a)
|
|
noexcept
|
|
{
|
|
return ~(popmask(a) - 1);
|
|
}
|
|
|
|
/// Convenience template. Vector compare instructions yield 0xff on equal;
|
|
/// sometimes one might need an actual value of 1 for accumulators or maybe
|
|
/// some bool-type reason...
|
|
template<class T>
|
|
inline T
|
|
ircd::util::popmask(const T a)
|
|
noexcept
|
|
{
|
|
return a & 1;
|
|
}
|