ceph/src/boost/libs/test/include/boost/test/data/monomorphic/singleton.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 single element monomorphic dataset
  10 // ***************************************************************************
  11
  12 #ifndef BOOST_TEST_DATA_MONOMORPHIC_SINGLETON_HPP_102211GER
  13 #define BOOST_TEST_DATA_MONOMORPHIC_SINGLETON_HPP_102211GER
  14
  15 // Boost.Test
  16 #include <boost/test/data/config.hpp>
  17 #include <boost/test/data/monomorphic/fwd.hpp>
  18
  19 #include <boost/test/detail/suppress_warnings.hpp>
  20
  21 //____________________________________________________________________________//
  22
  23 namespace boost {
  24 namespace unit_test {
  25 namespace data {
  26 namespace monomorphic {
  27
  28 // ************************************************************************** //
  29 // **************                    singleton                  ************** //
  30 // ************************************************************************** //
  31
  32 /// Models a single element data set
  33 template<typename T>
  34 class singleton {
  35 public:
  36     typedef typename boost::decay<T>::type sample;
  37
  38     enum { arity = 1 };
  39
  40     struct iterator {
  41         // Constructor
  42         explicit            iterator( singleton<T> const* owner )
  43         : m_owner( owner )
  44         {}
  45
  46         // forward iterator interface
  47         sample const&       operator*() const   { return m_owner->value(); }
  48         void                operator++() {}
  49
  50     private:
  51         singleton<T> const* m_owner;
  52     };
  53
  54     //! Constructor
  55     explicit        singleton( T&& value ) : m_value( std::forward<T>( value ) ) {}
  56
  57     //! Move constructor
  58     singleton( singleton&& s ) : m_value( std::forward<T>( s.m_value ) ) {}
  59
  60     //! Value access method
  61     T const&        value() const   { return m_value; }
  62
  63     //! dataset interface
  64     data::size_t    size() const    { return 1; }
  65     iterator        begin() const   { return iterator( this ); }
  66
  67 private:
  68     // Data members
  69     T               m_value;
  70 };
  71
  72 //____________________________________________________________________________//
  73
  74 // a singleton is a dataset
  75 template<typename T>
  76 struct is_dataset<singleton<T>> : mpl::true_ {};
  77
  78 //____________________________________________________________________________//
  79
  80 } // namespace monomorphic
  81
  82 /// @overload boost::unit_test::data::make()
  83 template<typename T>
  84 inline typename std::enable_if<!is_forward_iterable<T>::value &&
  85                                !monomorphic::is_dataset<T>::value &&
  86                                !boost::is_array<typename boost::remove_reference<T>::type>::value,
  87                                monomorphic::singleton<T>
  88 >::type
  89 make( T&& v )
  90 {
  91     return monomorphic::singleton<T>( std::forward<T>( v ) );
  92 }
  93
  94 //____________________________________________________________________________//
  95
  96 /// @overload boost::unit_test::data::make
  97 inline monomorphic::singleton<char*>
  98 make( char* str )
  99 {
 100     return monomorphic::singleton<char*>( std::move(str) );
 101 }
 102
 103 //____________________________________________________________________________//
 104
 105 /// @overload boost::unit_test::data::make
 106 inline monomorphic::singleton<char const*>
 107 make( char const* str )
 108 {
 109     return monomorphic::singleton<char const*>( std::move(str) );
 110 }
 111
 112 } // namespace data
 113 } // namespace unit_test
 114 } // namespace boost
 115
 116 #include <boost/test/detail/enable_warnings.hpp>
 117
 118 #endif // BOOST_TEST_DATA_MONOMORPHIC_SINGLETON_HPP_102211GER
 119