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utility: Code for using enumerations as flags/bitsets

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It baffles me that this is not just part of the language itself from the beginning, it's used nearly everywhere and is needed for type safety.
This commit is contained in:
Michael Fabian 'Xaymar' Dirks 2018-04-29 01:02:05 +02:00
parent 365b390e68
commit d59b54811f
3 changed files with 71 additions and 0 deletions
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2
CMakeLists.txt
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@ -112,6 +112,7 @@ SET(obs-stream-effects_HEADERS
"${PROJECT_SOURCE_DIR}/source/obs-audio-capture.h" "${PROJECT_SOURCE_DIR}/source/obs-audio-capture.h"
"${PROJECT_BINARY_DIR}/source/version.h" "${PROJECT_BINARY_DIR}/source/version.h"
"${PROJECT_SOURCE_DIR}/source/strings.h" "${PROJECT_SOURCE_DIR}/source/strings.h"
"${PROJECT_SOURCE_DIR}/source/utility.h"
"${PROJECT_SOURCE_DIR}/source/util-math.h" "${PROJECT_SOURCE_DIR}/source/util-math.h"
"${PROJECT_SOURCE_DIR}/source/util-memory.h" "${PROJECT_SOURCE_DIR}/source/util-memory.h"
) )
@ -135,6 +136,7 @@ SET(obs-stream-effects_SOURCES
"${PROJECT_SOURCE_DIR}/source/gs-vertex.cpp" "${PROJECT_SOURCE_DIR}/source/gs-vertex.cpp"
"${PROJECT_SOURCE_DIR}/source/gs-vertexbuffer.cpp" "${PROJECT_SOURCE_DIR}/source/gs-vertexbuffer.cpp"
"${PROJECT_SOURCE_DIR}/source/obs-audio-capture.cpp" "${PROJECT_SOURCE_DIR}/source/obs-audio-capture.cpp"
"${PROJECT_SOURCE_DIR}/source/utility.cpp"
"${PROJECT_SOURCE_DIR}/source/util-math.cpp" "${PROJECT_SOURCE_DIR}/source/util-math.cpp"
"${PROJECT_SOURCE_DIR}/source/util-memory.cpp" "${PROJECT_SOURCE_DIR}/source/util-memory.cpp"
) )

21
source/utility.cpp Normal file
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@ -0,0 +1,21 @@
/*
* Modern effects for a modern Streamer
* Copyright (C) 2018 Michael Fabian Dirks
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include "utility.h"

48
source/utility.h Normal file
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@ -0,0 +1,48 @@
/*
* Modern effects for a modern Streamer
* Copyright (C) 2018 Michael Fabian Dirks
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#pragma once
#include <type_traits>
template<typename Enum>
struct enable_bitmask_operators {
static const bool enable = false;
};
template<typename Enum>
typename std::enable_if<enable_bitmask_operators<Enum>::enable, Enum>::type
operator |(Enum lhs, Enum rhs) {
using underlying = typename std::underlying_type<Enum>::type;
return static_cast<Enum> (
static_cast<underlying>(lhs) |
static_cast<underlying>(rhs)
);
}
template<typename Enum>
typename std::enable_if<enable_bitmask_operators<Enum>::enable, Enum>::type
operator &(Enum lhs, Enum rhs) {
using underlying = typename std::underlying_type<Enum>::type;
return static_cast<Enum> (
static_cast<underlying>(lhs) &
static_cast<underlying>(rhs)
);
}
#define ENABLE_BITMASK_OPERATORS(x) template<> struct enable_bitmask_operators<x> { static const bool enable = true; };