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algebra/constants.h
Go to the documentation of this file.
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/**
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* \file IMP/algebra/constants.h \brief Various useful constants.
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*
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* Copyright 2007-2014 IMP Inventors. All rights reserved.
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*
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*/
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#ifndef IMPALGEBRA_CONSTANTS_H
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#define IMPALGEBRA_CONSTANTS_H
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#include <IMP/algebra/algebra_config.h>
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#include <cmath>
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IMPALGEBRA_BEGIN_NAMESPACE
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#if defined(_GLIBCXX_USE_C99_MATH) && defined(__GNUC__)
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//! the constant pi
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static
const
double
PI
= M_PI;
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#else
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//! the constant pi
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static
const
double
PI
= 3.1415926535897931;
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#endif // C99
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IMPALGEBRA_END_NAMESPACE
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#endif
/* IMPALGEBRA_CONSTANTS_H */
IMP::algebra::PI
static const double PI
the constant pi
Definition:
algebra/constants.h:21