mirror of
https://develop.openfoam.com/Development/openfoam.git
synced 2025-11-28 03:28:01 +00:00
125 lines
3.1 KiB
C
125 lines
3.1 KiB
C
/*---------------------------------------------------------------------------*\
|
|
========= |
|
|
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
|
|
\\ / O peration |
|
|
\\ / A nd | Copyright (C) 2018 OpenCFD Ltd.
|
|
\\/ M anipulation |
|
|
-------------------------------------------------------------------------------
|
|
License
|
|
This file is part of OpenFOAM.
|
|
|
|
OpenFOAM 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 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
OpenFOAM 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 OpenFOAM. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
Description
|
|
Test some bit-operations.
|
|
|
|
\*---------------------------------------------------------------------------*/
|
|
|
|
#include "bool.H"
|
|
#include "IOstreams.H"
|
|
|
|
#include <algorithm>
|
|
#include <type_traits>
|
|
#include <limits>
|
|
|
|
template<typename UIntType, UIntType v, unsigned int n>
|
|
struct set_lower_bits
|
|
:
|
|
public std::integral_constant
|
|
<
|
|
UIntType,
|
|
v | (v >> n) | set_lower_bits<UIntType, v | (v >> n), (n >> 1)>::value
|
|
>
|
|
{};
|
|
|
|
|
|
template<typename UIntType, UIntType v>
|
|
struct set_lower_bits<UIntType, v, 1>
|
|
:
|
|
public std::integral_constant<UIntType, v | (v >> 1)>
|
|
{};
|
|
|
|
|
|
template<typename UIntType, UIntType v>
|
|
struct pow2ceil
|
|
:
|
|
public std::integral_constant
|
|
<
|
|
UIntType,
|
|
set_lower_bits
|
|
<
|
|
UIntType,
|
|
v - 1,
|
|
(std::numeric_limits<UIntType>::digits >> 1)
|
|
>::value + 1
|
|
>
|
|
{};
|
|
|
|
|
|
// No quite
|
|
template<size_t N>
|
|
struct topbit : std::integral_constant<size_t, topbit<(N >> 1)>{} + 1> {};
|
|
|
|
template<> struct topbit<1> : std::integral_constant<size_t,1> {};
|
|
template<> struct topbit<0> : std::integral_constant<size_t,0> {};
|
|
|
|
using namespace Foam;
|
|
|
|
|
|
template<size_t N>
|
|
void printTopbit()
|
|
{
|
|
std::cout
|
|
<<"topbit<" << N << "> : " << topbit<N>::value << '\n';
|
|
}
|
|
|
|
|
|
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
|
|
|
|
int main(int argc, char *argv[])
|
|
{
|
|
Info<<"pow2ceil<10>: "
|
|
<< pow2ceil<unsigned, 10>::value << nl;
|
|
|
|
Info<<"pow2ceil<16>: "
|
|
<< pow2ceil<unsigned, 16>::value << nl;
|
|
|
|
Info<<"pow2ceil<369>: "
|
|
<< pow2ceil<unsigned, 369>::value << nl;
|
|
|
|
printTopbit<0>();
|
|
printTopbit<1>();
|
|
printTopbit<2>();
|
|
printTopbit<3>();
|
|
printTopbit<4>();
|
|
printTopbit<5>();
|
|
printTopbit<6>();
|
|
printTopbit<7>();
|
|
printTopbit<8>();
|
|
printTopbit<9>();
|
|
printTopbit<10>();
|
|
printTopbit<11>();
|
|
printTopbit<15>();
|
|
printTopbit<16>();
|
|
printTopbit<17>();
|
|
printTopbit<18>();
|
|
|
|
Info << "---\nEnd\n" << endl;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
// ************************************************************************* //
|