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third.hh
1 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
2 /* */
3 /* This file is part of the C++-library RFFGen. */
4 /* Copyright 2015 Lars Lubkoll */
5 /* */
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20 
21 #ifndef RFFGEN_THIRD_HH
22 #define RFFGEN_THIRD_HH
23 
24 #define HAVE_BOOST
25 
26 #ifdef HAVE_BOOST
27 #include <boost/math/constants/constants.hpp>
28 #endif
29 
33 namespace RFFGen
34 {
35 #ifdef HAVE_BOOST
36  constexpr double third() noexcept { return boost::math::constants::third<double>(); }
37  constexpr double twothirds() noexcept { return boost::math::constants::twothirds<double>(); }
38 #else
39  constexpr double third() noexcept { return 1./3.; }
40  constexpr double twothirds() noexcept { return 2*third(); }
41 #endif
42 }
47 #endif // RFFGEN_THIRD_HH
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