ceph/src/boost/libs/container_hash/test/check_float_funcs.cpp

   1
   2 // Copyright 2012 Daniel James.
   3 // Distributed under the Boost Software License, Version 1.0. (See accompanying
   4 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   5
   6 #if defined(__GNUC__)
   7 // in type_traits/is_complete.hpp:47
   8 #pragma GCC diagnostic ignored "-Wconversion"
   9 #endif
  10
  11 #include <boost/static_assert.hpp>
  12 #include <boost/type_traits/is_same.hpp>
  13 #include <boost/type_traits/is_convertible.hpp>
  14 #include <cmath>
  15
  16 namespace test
  17 {
  18     template <class T1>
  19     struct check_return_type
  20     {
  21         template <class T2>
  22         static void equals(T2)
  23         {
  24             BOOST_STATIC_ASSERT((boost::is_same<T1, T2>::value));
  25         }
  26
  27         template <class T2>
  28         static void equals_ref(T2&)
  29         {
  30             BOOST_STATIC_ASSERT((boost::is_same<T1, T2>::value));
  31         }
  32
  33         template <class T2>
  34         static void convertible(T2)
  35         {
  36             BOOST_STATIC_ASSERT((boost::is_convertible<T2, T1>::value));
  37         }
  38     };
  39 }
  40
  41 int main() {
  42     float f = 0;
  43     double d = 0;
  44     long double l = 0;
  45
  46     test::check_return_type<float>::equals(std::ldexp(f, 0));
  47     test::check_return_type<double>::equals(std::ldexp(d, 0));
  48     test::check_return_type<long double>::equals(std::ldexp(l, 0));
  49
  50     int dummy = 0;
  51
  52     test::check_return_type<float>::equals(std::frexp(f, &dummy));
  53     test::check_return_type<double>::equals(std::frexp(d, &dummy));
  54     test::check_return_type<long double>::equals(std::frexp(l, &dummy));
  55
  56 #if BOOST_HASH_USE_FPCLASSIFY
  57
  58     int (*fpc1)(float) = std::fpclassify;
  59     int (*fpc2)(double) = std::fpclassify;
  60     int (*fpc3)(long double) = std::fpclassify;
  61
  62 #endif
  63 }