boost/assign/ptr_list_of.hpp

   1 // Boost.Assign library
   2 //
   3 //  Copyright Thorsten Ottosen 2003-2005. Use, modification and
   4 //  distribution is subject to the Boost Software License, Version
   5 //  1.0. (See accompanying file LICENSE_1_0.txt or copy at
   6 //  http://www.boost.org/LICENSE_1_0.txt)
   7 //
   8 // For more information, see http://www.boost.org/libs/assign/
   9 //
  10
  11
  12 #ifndef BOOST_ASSIGN_PTR_LIST_OF_HPP
  13 #define BOOST_ASSIGN_PTR_LIST_OF_HPP
  14
  15 #if defined(_MSC_VER) && (_MSC_VER >= 1020)
  16 # pragma once
  17 #endif
  18
  19 #include <boost/assign/list_of.hpp>
  20 #include <boost/type_traits/remove_const.hpp>
  21 #include <boost/type_traits/remove_reference.hpp>
  22 #include <boost/type_traits/is_reference.hpp>
  23 #include <boost/static_assert.hpp>
  24 #include <boost/type_traits/detail/yes_no_type.hpp>
  25 #include <boost/type_traits/decay.hpp>
  26 #include <boost/type_traits/is_array.hpp>
  27 #include <boost/mpl/if.hpp>
  28 #include <boost/ptr_container/ptr_vector.hpp>
  29
  30 #include <boost/preprocessor/repetition/enum_binary_params.hpp>
  31 #include <boost/preprocessor/repetition/enum_params.hpp>
  32 #include <boost/preprocessor/iteration/local.hpp>
  33
  34 namespace boost
  35 {
  36
  37 namespace assign_detail
  38 {
  39     /////////////////////////////////////////////////////////////////////////
  40     // Part 1: flexible and efficient interface
  41     /////////////////////////////////////////////////////////////////////////
  42
  43     template< class T >
  44     class generic_ptr_list :
  45         public converter< generic_ptr_list<T>,
  46                           BOOST_DEDUCED_TYPENAME boost::ptr_vector<T>::iterator >
  47     {
  48     protected:
  49         typedef boost::ptr_vector<T>       impl_type;
  50         typedef std::auto_ptr<impl_type>   release_type;
  51         mutable impl_type                  values_;
  52
  53     public:
  54         typedef BOOST_DEDUCED_TYPENAME impl_type::iterator         iterator;
  55         typedef iterator                                           const_iterator;
  56         typedef BOOST_DEDUCED_TYPENAME impl_type::value_type       value_type;
  57         typedef BOOST_DEDUCED_TYPENAME impl_type::size_type        size_type;
  58         typedef BOOST_DEDUCED_TYPENAME impl_type::difference_type  difference_type;
  59     public:
  60         generic_ptr_list() : values_( 32u )
  61         { }
  62
  63         generic_ptr_list( release_type r ) : values_(r)
  64         { }
  65
  66         release_type release()
  67         {
  68             return values_.release();
  69         }
  70
  71     public:
  72         iterator begin() const       { return values_.begin(); }
  73         iterator end() const         { return values_.end(); }
  74         bool empty() const           { return values_.empty(); }
  75         size_type size() const       { return values_.size(); }
  76
  77     public:
  78
  79         operator impl_type() const
  80         {
  81             return values_;
  82         }
  83
  84         template< template<class,class,class> class Seq, class U,
  85                   class CA, class A >
  86         operator Seq<U,CA,A>() const
  87         {
  88             Seq<U,CA,A> result;
  89             result.transfer( result.end(), values_ );
  90             BOOST_ASSERT( empty() );
  91             return result;
  92         }
  93
  94         template< class PtrContainer >
  95         std::auto_ptr<PtrContainer> convert( const PtrContainer* c ) const
  96         {
  97             std::auto_ptr<PtrContainer> res( new PtrContainer() );
  98             while( !empty() )
  99                 res->insert( res->end(),
 100                              values_.pop_back().release() );
 101             return res;
 102         }
 103
 104         template< class PtrContainer >
 105         std::auto_ptr<PtrContainer> to_container( const PtrContainer& c ) const
 106         {
 107             return convert( &c );
 108         }
 109
 110     protected:
 111         void push_back( T* r ) { values_.push_back( r ); }
 112
 113     public:
 114         generic_ptr_list& operator()()
 115         {
 116             this->push_back( new T() );
 117             return *this;
 118         }
 119
 120         template< class U >
 121         generic_ptr_list& operator()( const U& u )
 122         {
 123             this->push_back( new T(u) );
 124             return *this;
 125         }
 126
 127
 128 #ifndef BOOST_ASSIGN_MAX_PARAMS // use user's value
 129 #define BOOST_ASSIGN_MAX_PARAMS 5
 130 #endif
 131 #define BOOST_ASSIGN_MAX_PARAMETERS (BOOST_ASSIGN_MAX_PARAMS - 1)
 132 #define BOOST_ASSIGN_PARAMS1(n) BOOST_PP_ENUM_PARAMS(n, class U)
 133 #define BOOST_ASSIGN_PARAMS2(n) BOOST_PP_ENUM_BINARY_PARAMS(n, U, const& u)
 134 #define BOOST_ASSIGN_PARAMS3(n) BOOST_PP_ENUM_PARAMS(n, u)
 135
 136 #define BOOST_PP_LOCAL_LIMITS (1, BOOST_ASSIGN_MAX_PARAMETERS)
 137 #define BOOST_PP_LOCAL_MACRO(n) \
 138     template< class U, BOOST_ASSIGN_PARAMS1(n) > \
 139     generic_ptr_list& operator()(U const& u, BOOST_ASSIGN_PARAMS2(n) ) \
 140     { \
 141         this->push_back( new T(u, BOOST_ASSIGN_PARAMS3(n))); \
 142         return *this; \
 143     } \
 144     /**/
 145
 146 #include BOOST_PP_LOCAL_ITERATE()
 147
 148     }; // class 'generic_ptr_list'
 149
 150 } // namespace 'assign_detail'
 151
 152 namespace assign
 153 {
 154     template< class T >
 155     inline assign_detail::generic_ptr_list<T>
 156     ptr_list_of()
 157     {
 158         return assign_detail::generic_ptr_list<T>()();
 159     }
 160
 161     template< class T, class U >
 162     inline assign_detail::generic_ptr_list<T>
 163     ptr_list_of( const U& t )
 164     {
 165         return assign_detail::generic_ptr_list<T>()( t );
 166     }
 167
 168
 169 #define BOOST_PP_LOCAL_LIMITS (1, BOOST_ASSIGN_MAX_PARAMETERS)
 170 #define BOOST_PP_LOCAL_MACRO(n) \
 171     template< class T, class U, BOOST_ASSIGN_PARAMS1(n) > \
 172     inline assign_detail::generic_ptr_list<T> \
 173     ptr_list_of(U const& u, BOOST_ASSIGN_PARAMS2(n) ) \
 174     { \
 175         return assign_detail::generic_ptr_list<T>()(u, BOOST_ASSIGN_PARAMS3(n)); \
 176     } \
 177     /**/
 178
 179 #include BOOST_PP_LOCAL_ITERATE()
 180
 181
 182 } // namespace 'assign'
 183 } // namespace 'boost'
 184
 185
 186 #undef BOOST_ASSIGN_PARAMS1
 187 #undef BOOST_ASSIGN_PARAMS2
 188 #undef BOOST_ASSIGN_PARAMS3
 189 #undef BOOST_ASSIGN_MAX_PARAMETERS
 190
 191 #endif