ceph/src/boost/libs/compute/include/boost/compute/detail/literal.hpp

   1 //---------------------------------------------------------------------------//
   2 // Copyright (c) 2013-2014 Kyle Lutz <kyle.r.lutz@gmail.com>
   3 //
   4 // Distributed under the Boost Software License, Version 1.0
   5 // See accompanying file LICENSE_1_0.txt or copy at
   6 // http://www.boost.org/LICENSE_1_0.txt
   7 //
   8 // See http://boostorg.github.com/compute for more information.
   9 //---------------------------------------------------------------------------//
  10
  11 #ifndef BOOST_COMPUTE_DETAIL_LITERAL_HPP
  12 #define BOOST_COMPUTE_DETAIL_LITERAL_HPP
  13
  14 #include <iomanip>
  15 #include <limits>
  16 #include <sstream>
  17
  18 #include <boost/type_traits/is_same.hpp>
  19
  20 #include <boost/compute/types/fundamental.hpp>
  21
  22 namespace boost {
  23 namespace compute {
  24 namespace detail {
  25
  26 template<class T>
  27 std::string make_literal(T x)
  28 {
  29     std::stringstream s;
  30     s << std::setprecision(
  31 #ifndef BOOST_NO_CXX11_NUMERIC_LIMITS
  32             std::numeric_limits<T>::max_digits10
  33 #else
  34             // We don't have max_digits10, so add 3 other digits (this is what is required for
  35             // float, and is one more than required for double).
  36             3 + std::numeric_limits<T>::digits10
  37 #endif
  38             )
  39       << std::scientific
  40       << x;
  41
  42     if(boost::is_same<T, float>::value || boost::is_same<T, float_>::value){
  43         s << "f";
  44     }
  45
  46     return s.str();
  47 }
  48
  49 } // end detail namespace
  50 } // end compute namespace
  51 } // end boost namespace
  52
  53 #endif // BOOST_COMPUTE_DETAIL_LITERAL_HPP