boost/tuple/detail/tuple_basic_no_partial_spec.hpp
// - tuple_basic_no_partial_spec.hpp ----------------------------------------- // Copyright (C) 1999, 2000 Jaakko Jarvi (jaakko.jarvi@cs.utu.fi) // Copyright (C) 2001 Douglas Gregor (gregod@rpi.edu) // Copyright (C) 2001 Gary Powell (gary.powell@sierra.com) // // Distributed under the Boost Software License, Version 1.0. (See // accompanying file LICENSE_1_0.txt or copy at // http://www.boost.org/LICENSE_1_0.txt) // For more information, see http://www.boost.org or http://lambda.cs.utu.fi // Revision History // 14 02 01 Remove extra ';'. Also, fixed 10-parameter to make_tuple. (DG) // 10 02 01 Fixed "null_type" constructors. // Implemented comparison operators globally. // Hide element_type_ref and element_type_const_ref. // (DG). // 09 02 01 Extended to tuples of length 10. Changed comparison for // operator<() // to the same used by std::pair<>, added cnull_type() (GP) // 03 02 01 Initial Version from original tuple.hpp code by JJ. (DG) // ----------------------------------------------------------------- #ifndef BOOST_TUPLE_BASIC_NO_PARTIAL_SPEC_HPP #define BOOST_TUPLE_BASIC_NO_PARTIAL_SPEC_HPP #include "boost/type_traits.hpp" #include <utility> #if defined BOOST_MSVC #pragma warning(disable:4518) // storage-class or type specifier(s) unexpected here; ignored #pragma warning(disable:4181) // qualifier applied to reference type ignored #pragma warning(disable:4227) // qualifier applied to reference type ignored #endif namespace boost { namespace tuples { // null_type denotes the end of a list built with "cons" struct null_type { null_type() {} null_type(const null_type&, const null_type&) {} }; // a helper function to provide a const null_type type temporary inline const null_type cnull_type() { return null_type(); } // forward declaration of tuple template< typename T1 = null_type, typename T2 = null_type, typename T3 = null_type, typename T4 = null_type, typename T5 = null_type, typename T6 = null_type, typename T7 = null_type, typename T8 = null_type, typename T9 = null_type, typename T10 = null_type > class tuple; // forward declaration of cons template<typename Head, typename Tail = null_type> struct cons; namespace detail { // Takes a pointer and routes all assignments to whatever it points to template<typename T> struct assign_to_pointee { public: explicit assign_to_pointee(T* p) : ptr(p) {} template<typename Other> assign_to_pointee& operator=(const Other& other) { *ptr = other; return *this; } private: T* ptr; }; // Swallows any assignment struct swallow_assign { template<typename T> swallow_assign const& operator=(const T&) const { return *this; } }; template <typename T> struct add_const_reference : add_reference<typename add_const<T>::type> {}; template <class MyTail> struct init_tail { // Each of vc6 and vc7 seem to require a different formulation // of this return type template <class H, class T> #if BOOST_WORKAROUND(BOOST_MSVC, < 1300) static typename add_reference<typename add_const<T>::type>::type #else static typename add_const_reference<T>::type #endif execute( cons<H,T> const& u, long ) { return u.get_tail(); } }; template <> struct init_tail<null_type> { template <class H> static null_type execute( cons<H,null_type> const& u, long ) { return null_type(); } template <class U> static null_type execute(U const&, ...) { return null_type(); } private: template <class H, class T> void execute( cons<H,T> const&, int); }; template <class Other> Other const& init_head( Other const& u, ... ) { return u; } template <class H, class T> typename add_reference<typename add_const<H>::type>::type init_head( cons<H,T> const& u, int ) { return u.get_head(); } inline char**** init_head(null_type const&, int); } // end of namespace detail // cons builds a heterogenous list of types template<typename Head, typename Tail> struct cons { typedef cons self_type; typedef Head head_type; typedef Tail tail_type; private: typedef typename boost::add_reference<head_type>::type head_ref; typedef typename boost::add_reference<tail_type>::type tail_ref; typedef typename detail::add_const_reference<head_type>::type head_cref; typedef typename detail::add_const_reference<tail_type>::type tail_cref; public: head_type head; tail_type tail; head_ref get_head() { return head; } tail_ref get_tail() { return tail; } head_cref get_head() const { return head; } tail_cref get_tail() const { return tail; } cons() : head(), tail() {} #if defined BOOST_MSVC template<typename Tail> cons(head_cref h /* = head_type() */, // causes MSVC 6.5 to barf. const Tail& t) : head(h), tail(t.head, t.tail) { } cons(head_cref h /* = head_type() */, // causes MSVC 6.5 to barf. const null_type& t) : head(h), tail(t) { } #else template<typename T> explicit cons(head_cref h, const T& t) : head(h), tail(t.head, t.tail) { } explicit cons(head_cref h = head_type(), tail_cref t = tail_type()) : head(h), tail(t) { } #endif template <class U> cons( const U& u ) : head(detail::init_head(u, 0)) , tail(detail::init_tail<Tail>::execute(u, 0L)) { } template<typename Other> cons& operator=(const Other& other) { head = other.head; tail = other.tail; return *this; } }; namespace detail { // Determines if the parameter is null_type template<typename T> struct is_null_type { enum { RET = 0 }; }; template<> struct is_null_type<null_type> { enum { RET = 1 }; }; /* Build a cons structure from the given Head and Tail. If both are null_type, return null_type. */ template<typename Head, typename Tail> struct build_cons { private: enum { tail_is_null_type = is_null_type<Tail>::RET }; public: typedef cons<Head, Tail> RET; }; template<> struct build_cons<null_type, null_type> { typedef null_type RET; }; // Map the N elements of a tuple into a cons list template< typename T1, typename T2 = null_type, typename T3 = null_type, typename T4 = null_type, typename T5 = null_type, typename T6 = null_type, typename T7 = null_type, typename T8 = null_type, typename T9 = null_type, typename T10 = null_type > struct map_tuple_to_cons { typedef typename detail::build_cons<T10, null_type >::RET cons10; typedef typename detail::build_cons<T9, cons10>::RET cons9; typedef typename detail::build_cons<T8, cons9>::RET cons8; typedef typename detail::build_cons<T7, cons8>::RET cons7; typedef typename detail::build_cons<T6, cons7>::RET cons6; typedef typename detail::build_cons<T5, cons6>::RET cons5; typedef typename detail::build_cons<T4, cons5>::RET cons4; typedef typename detail::build_cons<T3, cons4>::RET cons3; typedef typename detail::build_cons<T2, cons3>::RET cons2; typedef typename detail::build_cons<T1, cons2>::RET cons1; }; // Workaround the lack of partial specialization in some compilers template<int N> struct _element_type { template<typename Tuple> struct inner { private: typedef typename Tuple::tail_type tail_type; typedef _element_type<N-1> next_elt_type; public: typedef typename _element_type<N-1>::template inner<tail_type>::RET RET; }; }; template<> struct _element_type<0> { template<typename Tuple> struct inner { typedef typename Tuple::head_type RET; }; }; } // namespace detail // Return the Nth type of the given Tuple template<int N, typename Tuple> struct element { private: typedef detail::_element_type<N> nth_type; public: typedef typename nth_type::template inner<Tuple>::RET RET; typedef RET type; }; namespace detail { #if defined(BOOST_MSVC) && (BOOST_MSVC == 1300) // special workaround for vc7: template <bool x> struct reference_adder { template <class T> struct rebind { typedef T& type; }; }; template <> struct reference_adder<true> { template <class T> struct rebind { typedef T type; }; }; // Return a reference to the Nth type of the given Tuple template<int N, typename Tuple> struct element_ref { private: typedef typename element<N, Tuple>::RET elt_type; enum { is_ref = is_reference<elt_type>::value }; public: typedef reference_adder<is_ref>::rebind<elt_type>::type RET; typedef RET type; }; // Return a const reference to the Nth type of the given Tuple template<int N, typename Tuple> struct element_const_ref { private: typedef typename element<N, Tuple>::RET elt_type; enum { is_ref = is_reference<elt_type>::value }; public: typedef reference_adder<is_ref>::rebind<const elt_type>::type RET; typedef RET type; }; #else // vc7 // Return a reference to the Nth type of the given Tuple template<int N, typename Tuple> struct element_ref { private: typedef typename element<N, Tuple>::RET elt_type; public: typedef typename add_reference<elt_type>::type RET; typedef RET type; }; // Return a const reference to the Nth type of the given Tuple template<int N, typename Tuple> struct element_const_ref { private: typedef typename element<N, Tuple>::RET elt_type; public: typedef typename add_reference<const elt_type>::type RET; typedef RET type; }; #endif // vc7 } // namespace detail // Get length of this tuple template<typename Tuple> struct length { BOOST_STATIC_CONSTANT(int, value = 1 + length<typename Tuple::tail_type>::value); }; template<> struct length<tuple<> > { BOOST_STATIC_CONSTANT(int, value = 0); }; template<> struct length<null_type> { BOOST_STATIC_CONSTANT(int, value = 0); }; namespace detail { // Reference the Nth element in a tuple and retrieve it with "get" template<int N> struct get_class { template<typename Head, typename Tail> static inline typename detail::element_ref<N, cons<Head, Tail> >::RET get(cons<Head, Tail>& t) { return get_class<N-1>::get(t.tail); } template<typename Head, typename Tail> static inline typename detail::element_const_ref<N, cons<Head, Tail> >::RET get(const cons<Head, Tail>& t) { return get_class<N-1>::get(t.tail); } }; template<> struct get_class<0> { template<typename Head, typename Tail> static inline typename add_reference<Head>::type get(cons<Head, Tail>& t) { return t.head; } template<typename Head, typename Tail> static inline typename add_reference<const Head>::type get(const cons<Head, Tail>& t) { return t.head; } }; } // namespace detail // tuple class template< typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8, typename T9, typename T10 > class tuple : public detail::map_tuple_to_cons<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10>::cons1 { private: typedef detail::map_tuple_to_cons<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10> mapped_tuple; typedef typename mapped_tuple::cons10 cons10; typedef typename mapped_tuple::cons9 cons9; typedef typename mapped_tuple::cons8 cons8; typedef typename mapped_tuple::cons7 cons7; typedef typename mapped_tuple::cons6 cons6; typedef typename mapped_tuple::cons5 cons5; typedef typename mapped_tuple::cons4 cons4; typedef typename mapped_tuple::cons3 cons3; typedef typename mapped_tuple::cons2 cons2; typedef typename mapped_tuple::cons1 cons1; typedef typename detail::add_const_reference<T1>::type t1_cref; typedef typename detail::add_const_reference<T2>::type t2_cref; typedef typename detail::add_const_reference<T3>::type t3_cref; typedef typename detail::add_const_reference<T4>::type t4_cref; typedef typename detail::add_const_reference<T5>::type t5_cref; typedef typename detail::add_const_reference<T6>::type t6_cref; typedef typename detail::add_const_reference<T7>::type t7_cref; typedef typename detail::add_const_reference<T8>::type t8_cref; typedef typename detail::add_const_reference<T9>::type t9_cref; typedef typename detail::add_const_reference<T10>::type t10_cref; public: typedef cons1 inherited; typedef tuple self_type; tuple() : cons1(T1(), cons2(T2(), cons3(T3(), cons4(T4(), cons5(T5(), cons6(T6(),cons7(T7(),cons8(T8(),cons9(T9(),cons10(T10())))))))))) {} tuple( t1_cref t1, t2_cref t2, t3_cref t3 = T3(), t4_cref t4 = T4(), t5_cref t5 = T5(), t6_cref t6 = T6(), t7_cref t7 = T7(), t8_cref t8 = T8(), t9_cref t9 = T9(), t10_cref t10 = T10() ) : cons1(t1, cons2(t2, cons3(t3, cons4(t4, cons5(t5, cons6(t6,cons7(t7,cons8(t8,cons9(t9,cons10(t10)))))))))) { } explicit tuple(t1_cref t1) : cons1(t1, cons2(T2(), cons3(T3(), cons4(T4(), cons5(T5(), cons6(T6(),cons7(T7(),cons8(T8(),cons9(T9(),cons10(T10())))))))))) {} template<typename Head, typename Tail> tuple(const cons<Head, Tail>& other) : cons1(other.head, other.tail) { } template<typename First, typename Second> self_type& operator=(const std::pair<First, Second>& other) { this->head = other.first; this->tail.head = other.second; return *this; } template<typename Head, typename Tail> self_type& operator=(const cons<Head, Tail>& other) { this->head = other.head; this->tail = other.tail; return *this; } }; namespace detail { template<int N> struct workaround_holder {}; } // namespace detail template<int N, typename Head, typename Tail> typename detail::element_ref<N, cons<Head, Tail> >::RET get(cons<Head, Tail>& t, detail::workaround_holder<N>* = 0) { return detail::get_class<N>::get(t); } template<int N, typename Head, typename Tail> typename detail::element_const_ref<N, cons<Head, Tail> >::RET get(const cons<Head, Tail>& t, detail::workaround_holder<N>* = 0) { return detail::get_class<N>::get(t); } // Make a tuple template<typename T1> inline tuple<T1> make_tuple(const T1& t1) { return tuple<T1>(t1); } // Make a tuple template<typename T1, typename T2> inline tuple<T1, T2> make_tuple(const T1& t1, const T2& t2) { return tuple<T1, T2>(t1, t2); } // Make a tuple template<typename T1, typename T2, typename T3> inline tuple<T1, T2, T3> make_tuple(const T1& t1, const T2& t2, const T3& t3) { return tuple<T1, T2, T3>(t1, t2, t3); } // Make a tuple template<typename T1, typename T2, typename T3, typename T4> inline tuple<T1, T2, T3, T4> make_tuple(const T1& t1, const T2& t2, const T3& t3, const T4& t4) { return tuple<T1, T2, T3, T4>(t1, t2, t3, t4); } // Make a tuple template<typename T1, typename T2, typename T3, typename T4, typename T5> inline tuple<T1, T2, T3, T4, T5> make_tuple(const T1& t1, const T2& t2, const T3& t3, const T4& t4, const T5& t5) { return tuple<T1, T2, T3, T4, T5>(t1, t2, t3, t4, t5); } // Make a tuple template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6> inline tuple<T1, T2, T3, T4, T5, T6> make_tuple(const T1& t1, const T2& t2, const T3& t3, const T4& t4, const T5& t5, const T6& t6) { return tuple<T1, T2, T3, T4, T5, T6>(t1, t2, t3, t4, t5, t6); } // Make a tuple template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7> inline tuple<T1, T2, T3, T4, T5, T6, T7> make_tuple(const T1& t1, const T2& t2, const T3& t3, const T4& t4, const T5& t5, const T6& t6, const T7& t7) { return tuple<T1, T2, T3, T4, T5, T6, T7>(t1, t2, t3, t4, t5, t6, t7); } // Make a tuple template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8> inline tuple<T1, T2, T3, T4, T5, T6, T7, T8> make_tuple(const T1& t1, const T2& t2, const T3& t3, const T4& t4, const T5& t5, const T6& t6, const T7& t7, const T8& t8) { return tuple<T1, T2, T3, T4, T5, T6, T7, T8>(t1, t2, t3, t4, t5, t6, t7, t8); } // Make a tuple template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8, typename T9> inline tuple<T1, T2, T3, T4, T5, T6, T7, T8, T9> make_tuple(const T1& t1, const T2& t2, const T3& t3, const T4& t4, const T5& t5, const T6& t6, const T7& t7, const T8& t8, const T9& t9) { return tuple<T1, T2, T3, T4, T5, T6, T7, T8, T9>(t1, t2, t3, t4, t5, t6, t7, t8, t9); } // Make a tuple template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8, typename T9, typename T10> inline tuple<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10> make_tuple(const T1& t1, const T2& t2, const T3& t3, const T4& t4, const T5& t5, const T6& t6, const T7& t7, const T8& t8, const T9& t9, const T10& t10) { return tuple<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10>(t1, t2, t3, t4, t5, t6, t7, t8, t9, t10); } // Tie variables into a tuple template<typename T1> inline tuple<detail::assign_to_pointee<T1> > tie(T1& t1) { return make_tuple(detail::assign_to_pointee<T1>(&t1)); } // Tie variables into a tuple template<typename T1, typename T2> inline tuple<detail::assign_to_pointee<T1>, detail::assign_to_pointee<T2> > tie(T1& t1, T2& t2) { return make_tuple(detail::assign_to_pointee<T1>(&t1), detail::assign_to_pointee<T2>(&t2)); } // Tie variables into a tuple template<typename T1, typename T2, typename T3> inline tuple<detail::assign_to_pointee<T1>, detail::assign_to_pointee<T2>, detail::assign_to_pointee<T3> > tie(T1& t1, T2& t2, T3& t3) { return make_tuple(detail::assign_to_pointee<T1>(&t1), detail::assign_to_pointee<T2>(&t2), detail::assign_to_pointee<T3>(&t3)); } // Tie variables into a tuple template<typename T1, typename T2, typename T3, typename T4> inline tuple<detail::assign_to_pointee<T1>, detail::assign_to_pointee<T2>, detail::assign_to_pointee<T3>, detail::assign_to_pointee<T4> > tie(T1& t1, T2& t2, T3& t3, T4& t4) { return make_tuple(detail::assign_to_pointee<T1>(&t1), detail::assign_to_pointee<T2>(&t2), detail::assign_to_pointee<T3>(&t3), detail::assign_to_pointee<T4>(&t4)); } // Tie variables into a tuple template<typename T1, typename T2, typename T3, typename T4, typename T5> inline tuple<detail::assign_to_pointee<T1>, detail::assign_to_pointee<T2>, detail::assign_to_pointee<T3>, detail::assign_to_pointee<T4>, detail::assign_to_pointee<T5> > tie(T1& t1, T2& t2, T3& t3, T4& t4, T5 &t5) { return make_tuple(detail::assign_to_pointee<T1>(&t1), detail::assign_to_pointee<T2>(&t2), detail::assign_to_pointee<T3>(&t3), detail::assign_to_pointee<T4>(&t4), detail::assign_to_pointee<T5>(&t5)); } // Tie variables into a tuple template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6> inline tuple<detail::assign_to_pointee<T1>, detail::assign_to_pointee<T2>, detail::assign_to_pointee<T3>, detail::assign_to_pointee<T4>, detail::assign_to_pointee<T5>, detail::assign_to_pointee<T6> > tie(T1& t1, T2& t2, T3& t3, T4& t4, T5 &t5, T6 &t6) { return make_tuple(detail::assign_to_pointee<T1>(&t1), detail::assign_to_pointee<T2>(&t2), detail::assign_to_pointee<T3>(&t3), detail::assign_to_pointee<T4>(&t4), detail::assign_to_pointee<T5>(&t5), detail::assign_to_pointee<T6>(&t6)); } // Tie variables into a tuple template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7> inline tuple<detail::assign_to_pointee<T1>, detail::assign_to_pointee<T2>, detail::assign_to_pointee<T3>, detail::assign_to_pointee<T4>, detail::assign_to_pointee<T5>, detail::assign_to_pointee<T6>, detail::assign_to_pointee<T7> > tie(T1& t1, T2& t2, T3& t3, T4& t4, T5 &t5, T6 &t6, T7 &t7) { return make_tuple(detail::assign_to_pointee<T1>(&t1), detail::assign_to_pointee<T2>(&t2), detail::assign_to_pointee<T3>(&t3), detail::assign_to_pointee<T4>(&t4), detail::assign_to_pointee<T5>(&t5), detail::assign_to_pointee<T6>(&t6), detail::assign_to_pointee<T7>(&t7)); } // Tie variables into a tuple template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8> inline tuple<detail::assign_to_pointee<T1>, detail::assign_to_pointee<T2>, detail::assign_to_pointee<T3>, detail::assign_to_pointee<T4>, detail::assign_to_pointee<T5>, detail::assign_to_pointee<T6>, detail::assign_to_pointee<T7>, detail::assign_to_pointee<T8> > tie(T1& t1, T2& t2, T3& t3, T4& t4, T5 &t5, T6 &t6, T7 &t7, T8 &t8) { return make_tuple(detail::assign_to_pointee<T1>(&t1), detail::assign_to_pointee<T2>(&t2), detail::assign_to_pointee<T3>(&t3), detail::assign_to_pointee<T4>(&t4), detail::assign_to_pointee<T5>(&t5), detail::assign_to_pointee<T6>(&t6), detail::assign_to_pointee<T7>(&t7), detail::assign_to_pointee<T8>(&t8)); } // Tie variables into a tuple template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8, typename T9> inline tuple<detail::assign_to_pointee<T1>, detail::assign_to_pointee<T2>, detail::assign_to_pointee<T3>, detail::assign_to_pointee<T4>, detail::assign_to_pointee<T5>, detail::assign_to_pointee<T6>, detail::assign_to_pointee<T7>, detail::assign_to_pointee<T8>, detail::assign_to_pointee<T9> > tie(T1& t1, T2& t2, T3& t3, T4& t4, T5 &t5, T6 &t6, T7 &t7, T8 &t8, T9 &t9) { return make_tuple(detail::assign_to_pointee<T1>(&t1), detail::assign_to_pointee<T2>(&t2), detail::assign_to_pointee<T3>(&t3), detail::assign_to_pointee<T4>(&t4), detail::assign_to_pointee<T5>(&t5), detail::assign_to_pointee<T6>(&t6), detail::assign_to_pointee<T7>(&t7), detail::assign_to_pointee<T8>(&t8), detail::assign_to_pointee<T9>(&t9)); } // Tie variables into a tuple template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8, typename T9, typename T10> inline tuple<detail::assign_to_pointee<T1>, detail::assign_to_pointee<T2>, detail::assign_to_pointee<T3>, detail::assign_to_pointee<T4>, detail::assign_to_pointee<T5>, detail::assign_to_pointee<T6>, detail::assign_to_pointee<T7>, detail::assign_to_pointee<T8>, detail::assign_to_pointee<T9>, detail::assign_to_pointee<T10> > tie(T1& t1, T2& t2, T3& t3, T4& t4, T5 &t5, T6 &t6, T7 &t7, T8 &t8, T9 &t9, T10 &t10) { return make_tuple(detail::assign_to_pointee<T1>(&t1), detail::assign_to_pointee<T2>(&t2), detail::assign_to_pointee<T3>(&t3), detail::assign_to_pointee<T4>(&t4), detail::assign_to_pointee<T5>(&t5), detail::assign_to_pointee<T6>(&t6), detail::assign_to_pointee<T7>(&t7), detail::assign_to_pointee<T8>(&t8), detail::assign_to_pointee<T9>(&t9), detail::assign_to_pointee<T10>(&t10)); } // "ignore" allows tuple positions to be ignored when using "tie". detail::swallow_assign const ignore = detail::swallow_assign(); } // namespace tuples } // namespace boost #endif // BOOST_TUPLE_BASIC_NO_PARTIAL_SPEC_HPP