ceph/src/boost/boost/units/is_dimensionless.hpp

   1 // Boost.Units - A C++ library for zero-overhead dimensional analysis and
   2 // unit/quantity manipulation and conversion
   3 //
   4 // Copyright (C) 2003-2008 Matthias Christian Schabel
   5 // Copyright (C) 2008 Steven Watanabe
   6 //
   7 // Distributed under the Boost Software License, Version 1.0. (See
   8 // accompanying file LICENSE_1_0.txt or copy at
   9 // http://www.boost.org/LICENSE_1_0.txt)
  10
  11 #ifndef BOOST_UNITS_IS_DIMENSIONLESS_HPP
  12 #define BOOST_UNITS_IS_DIMENSIONLESS_HPP
  13
  14 ///
  15 /// \file
  16 /// \brief Check if a unit or quantity is dimensionless.
  17 ///
  18
  19 #include <boost/mpl/bool.hpp>
  20 #include <boost/units/units_fwd.hpp>
  21
  22 namespace boost {
  23
  24 namespace units {
  25
  26 template<class T>
  27 struct is_dimensionless :
  28     public mpl::false_
  29 { };
  30
  31 /// Check if a unit is dimensionless.
  32 template<class System>
  33 struct is_dimensionless< unit<dimensionless_type,System> > :
  34     public mpl::true_
  35 { };
  36
  37 /// Check if a quantity is dimensionless.
  38 template<class Unit,class Y>
  39 struct is_dimensionless< quantity<Unit,Y> > :
  40     public is_dimensionless<Unit>
  41 { };
  42
  43 } // namespace units
  44
  45 } // namespace boost
  46
  47 #endif // BOOST_UNITS_IS_DIMENSIONLESS_HPP