ceph/src/boost/boost/test/data/monomorphic/sample_merge.hpp

   1 //  (C) Copyright Gennadiy Rozental 2001.
   2 //  Distributed under the Boost Software License, Version 1.0.
   3 //  (See accompanying file LICENSE_1_0.txt or copy at
   4 //  http://www.boost.org/LICENSE_1_0.txt)
   5
   6 //  See http://www.boost.org/libs/test for the library home page.
   7 //
   8 /// @file
   9 /// Defines helper routines and types for merging monomorphic samples
  10 // ***************************************************************************
  11
  12 #ifndef BOOST_TEST_DATA_MONOMORPHIC_SAMPLE_MERGE_HPP
  13 #define BOOST_TEST_DATA_MONOMORPHIC_SAMPLE_MERGE_HPP
  14
  15 // Boost.Test
  16 #include <boost/test/data/config.hpp>
  17 #include <boost/test/data/index_sequence.hpp>
  18
  19 #include <boost/test/data/monomorphic/fwd.hpp>
  20
  21 #include <boost/test/detail/suppress_warnings.hpp>
  22
  23 namespace boost {
  24 namespace unit_test {
  25 namespace data {
  26 namespace monomorphic {
  27
  28 //____________________________________________________________________________//
  29
  30 namespace ds_detail {
  31
  32 template <class T>
  33 struct is_tuple : std::false_type {};
  34
  35 template <class ...T>
  36 struct is_tuple<std::tuple<T...>> : std::true_type {};
  37
  38 template <class T>
  39 struct is_tuple<T&&> : is_tuple<typename std::decay<T>::type> {};
  40
  41 template <class T>
  42 struct is_tuple<T&> : is_tuple<typename std::decay<T>::type> {};
  43
  44 template<typename T>
  45 inline auto as_tuple_impl_xvalues( T const & arg, std::false_type  /* is_rvalue_ref */ )
  46   -> decltype(std::tuple<T const&>(arg)) {
  47     //return std::tuple<T const&>(arg);
  48     return std::forward_as_tuple(arg);
  49 }
  50
  51 template<typename T>
  52 inline auto as_tuple_impl_xvalues( T && arg, std::true_type  /* is_rvalue_ref */ )
  53   -> decltype(std::make_tuple(std::forward<T>(arg))) {
  54     return std::make_tuple(std::forward<T>(arg));
  55 }
  56
  57
  58 template<typename T>
  59 inline auto as_tuple_impl( T && arg, std::false_type  /* is_tuple = nullptr */ )
  60   -> decltype(as_tuple_impl_xvalues(std::forward<T>(arg),
  61               typename std::is_rvalue_reference<T&&>::type())) {
  62     return as_tuple_impl_xvalues(std::forward<T>(arg),
  63                                  typename std::is_rvalue_reference<T&&>::type());
  64 }
  65
  66 //____________________________________________________________________________//
  67
  68 template<typename T>
  69 inline T &&
  70 as_tuple_impl(T && arg, std::true_type  /* is_tuple */ ) {
  71     return std::forward<T>(arg);
  72 }
  73
  74 template<typename T>
  75 inline auto as_tuple( T && arg )
  76   -> decltype( as_tuple_impl(std::forward<T>(arg),
  77                              typename ds_detail::is_tuple<T>::type()) ) {
  78   return as_tuple_impl(std::forward<T>(arg),
  79                        typename ds_detail::is_tuple<T>::type());
  80 }
  81
  82 //____________________________________________________________________________//
  83
  84 } // namespace ds_detail
  85
  86 template<typename T1, typename T2>
  87 inline auto
  88 sample_merge( T1 && a1, T2 && a2 )
  89     -> decltype( std::tuple_cat(ds_detail::as_tuple(std::forward<T1>(a1)),
  90                                 ds_detail::as_tuple(std::forward<T2>(a2)) ) ) {
  91     return std::tuple_cat(ds_detail::as_tuple(std::forward<T1>(a1)),
  92                           ds_detail::as_tuple(std::forward<T2>(a2)));
  93 }
  94
  95 } // namespace monomorphic
  96 } // namespace data
  97 } // namespace unit_test
  98 } // namespace boost
  99
 100 #include <boost/test/detail/enable_warnings.hpp>
 101
 102 #endif // BOOST_TEST_DATA_MONOMORPHIC_SAMPLE_MERGE_HPP
 103