ceph/src/boost/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 private:
  36     typedef typename boost::decay<T>::type sample;
  37
  38 public:
  39
  40     enum { arity = 1 };
  41
  42     struct iterator {
  43         // Constructor
  44         explicit            iterator( singleton<T> const* owner )
  45         : m_owner( owner )
  46         {}
  47
  48         // forward iterator interface
  49         sample const&       operator*() const   { return m_owner->value(); }
  50         void                operator++() {}
  51
  52     private:
  53         singleton<T> const* m_owner;
  54     };
  55
  56     //! Constructor
  57     explicit        singleton( T&& value ) : m_value( std::forward<T>( value ) ) {}
  58
  59     //! Move constructor
  60     singleton( singleton&& s ) : m_value( std::forward<T>( s.m_value ) ) {}
  61
  62     //! Value access method
  63     T const&        value() const   { return m_value; }
  64
  65     //! dataset interface
  66     data::size_t    size() const    { return 1; }
  67     iterator        begin() const   { return iterator( this ); }
  68
  69 private:
  70     // Data members
  71     T               m_value;
  72 };
  73
  74 //____________________________________________________________________________//
  75
  76 // a singleton is a dataset
  77 template<typename T>
  78 struct is_dataset<singleton<T>> : mpl::true_ {};
  79
  80 //____________________________________________________________________________//
  81
  82 } // namespace monomorphic
  83
  84 /// @overload boost::unit_test::data::make()
  85 template<typename T>
  86 inline typename std::enable_if<!is_container_forward_iterable<T>::value &&
  87                                !monomorphic::is_dataset<T>::value &&
  88                                !boost::is_array<typename boost::remove_reference<T>::type>::value,
  89                                monomorphic::singleton<T>
  90 >::type
  91 make( T&& v )
  92 {
  93     return monomorphic::singleton<T>( std::forward<T>( v ) );
  94 }
  95
  96 //____________________________________________________________________________//
  97
  98 /// @overload boost::unit_test::data::make
  99 inline monomorphic::singleton<char*>
 100 make( char* str )
 101 {
 102     return monomorphic::singleton<char*>( std::move(str) );
 103 }
 104
 105 //____________________________________________________________________________//
 106
 107 /// @overload boost::unit_test::data::make
 108 inline monomorphic::singleton<char const*>
 109 make( char const* str )
 110 {
 111     return monomorphic::singleton<char const*>( std::move(str) );
 112 }
 113
 114 } // namespace data
 115 } // namespace unit_test
 116 } // namespace boost
 117
 118 #include <boost/test/detail/enable_warnings.hpp>
 119
 120 #endif // BOOST_TEST_DATA_MONOMORPHIC_SINGLETON_HPP_102211GER
 121