e623e6a865
- in many places the string.H include is redundant anyhow. May wish to change to foamString.H (or equiv) in the future
131 lines
5.0 KiB
C
131 lines
5.0 KiB
C
/*---------------------------------------------------------------------------*\
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========= |
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\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
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\\ / O peration |
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\\ / A nd | www.openfoam.com
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\\/ M anipulation |
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-------------------------------------------------------------------------------
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Copyright (C) 2018-2022 OpenCFD Ltd.
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-------------------------------------------------------------------------------
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License
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This file is part of OpenFOAM.
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OpenFOAM is free software: you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with OpenFOAM. If not, see <http://www.gnu.org/licenses/>.
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Description
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Print some numerical limits.
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\*---------------------------------------------------------------------------*/
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#include <cmath>
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#include <limits>
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#include "int.H"
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#include "uint.H"
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#include "scalar.H"
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#include "word.H"
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#include "IOstreams.H"
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using namespace Foam;
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std::ostream& print(const char* tag, float val)
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{
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std::cout
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<< tag << val
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<< " 0x" << std::hex << *reinterpret_cast<const uint32_t*>(&val);
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return std::cout;
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}
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std::ostream& print(const char* tag, double val)
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{
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std::cout
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<< tag << val
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<< " 0x" << std::hex << *reinterpret_cast<const uint64_t*>(&val);
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return std::cout;
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}
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// Have (float|double)Scalar(GREAT|SMALL|..)
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#define PrintFloatLimits(FloatType, NanFunction) \
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{ \
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print("max:", std::numeric_limits<FloatType>::max()); \
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print(" VGREAT:", FloatType##ScalarVGREAT); \
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print(" ROOTVGREAT:", FloatType##ScalarROOTVGREAT) << nl; \
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\
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print("min:", std::numeric_limits<FloatType>::min()); \
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print(" VSMALL:", FloatType##ScalarVSMALL); \
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print(" ROOTVSMALL:", FloatType##ScalarROOTVSMALL) << nl; \
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\
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print("epsilon:", std::numeric_limits<FloatType>::epsilon()); \
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print(" SMALL:", FloatType##ScalarSMALL); \
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print(" ROOTSMALL:", FloatType##ScalarROOTSMALL) << nl; \
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\
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print("1/epsilon:", 1/std::numeric_limits<FloatType>::epsilon()); \
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print(" GREAT:", FloatType##ScalarGREAT); \
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print(" ROOTGREAT:", FloatType##ScalarROOTGREAT) << nl; \
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\
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print("nan:", std::NanFunction("nan")) << nl; \
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}
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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// Main program:
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int main(int argc, char *argv[])
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{
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//NONE cout<<"int16:" << pTraits<int16_t>::max << nl;
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cout<< "=max=" << nl;
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cout<< "uint8:" << pTraits<uint8_t>::max << nl;
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cout<< "int16:" << std::numeric_limits<int16_t>::max() << nl;
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cout<< "int32:" << pTraits<int32_t>::max << nl;
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cout<< "uint32:" << pTraits<uint32_t>::max << nl;
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cout<< "int64:" << pTraits<int64_t>::max << nl;
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cout<< "uint64:" << pTraits<uint64_t>::max << nl;
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cout<< nl;
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cout<< "int16:" << std::numeric_limits<int16_t>::max() << nl;
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cout<< "int32:" << pTraits<int32_t>::max << nl;
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cout<< "uint32:" << pTraits<uint32_t>::max << nl;
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cout<< "int64:" << pTraits<int64_t>::max << nl;
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cout<< "uint64:" << pTraits<uint64_t>::max << nl;
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cout<< nl << "=digits=" << nl;
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cout<< "int16:" << std::numeric_limits<int16_t>::digits << nl;
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cout<< "int32:" << std::numeric_limits<int32_t>::digits << nl;
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cout<< "uint32:" << std::numeric_limits<uint32_t>::digits << nl;
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cout<< "int64:" << std::numeric_limits<int64_t>::digits << nl;
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cout<< "uint64:" << std::numeric_limits<uint64_t>::digits << nl;
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cout<< "float:" << std::numeric_limits<float>::digits << nl;
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cout<< "double:" << std::numeric_limits<double>::digits << nl;
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cout<< "long double:" << std::numeric_limits<long double>::digits << nl;
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// std::nanl (long double)
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cout<< nl;
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cout<< nl << "=float=" << nl;
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PrintFloatLimits(float, nanf);
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cout<< nl << "=double=" << nl;
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PrintFloatLimits(double, nan);
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cout<< "---\nEnd\n" << std::endl;
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return 0;
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}
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// ************************************************************************* //
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