1 // - tuple_basic_no_partial_spec.hpp -----------------------------------------
3 // Copyright (C) 1999, 2000 Jaakko Järvi (jaakko.jarvi@cs.utu.fi)
4 // Copyright (C) 2001 Doug Gregor (gregod@rpi.edu)
5 // Copyright (C) 2001 Gary Powell (gary.powell@sierra.com)
7 // Permission to copy, use, sell and distribute this software is granted
8 // provided this copyright notice appears in all copies.
9 // Permission to modify the code and to distribute modified code is granted
10 // provided this copyright notice appears in all copies, and a notice
11 // that the code was modified is included with the copyright notice.
13 // This software is provided "as is" without express or implied warranty,
14 // and with no claim as to its suitability for any purpose.
16 // For more information, see http://www.boost.org or http://lambda.cs.utu.fi
19 // 14 02 01 Remove extra ';'. Also, fixed 10-parameter to make_tuple. (DG)
20 // 10 02 01 Fixed "null_type" constructors.
21 // Implemented comparison operators globally.
22 // Hide element_type_ref and element_type_const_ref.
24 // 09 02 01 Extended to tuples of length 10. Changed comparison for
26 // to the same used by std::pair<>, added cnull_type() (GP)
27 // 03 02 01 Initial Version from original tuple.hpp code by JJ. (DG)
29 // -----------------------------------------------------------------
31 #ifndef BOOST_TUPLE_BASIC_NO_PARTIAL_SPEC_HPP
32 #define BOOST_TUPLE_BASIC_NO_PARTIAL_SPEC_HPP
34 #include "boost/type_traits.hpp"
37 #if defined BOOST_MSVC
38 #pragma warning(disable:4518) // storage-class or type specifier(s) unexpected here; ignored
39 #pragma warning(disable:4181) // qualifier applied to reference type ignored
40 #pragma warning(disable:4227) // qualifier applied to reference type ignored
46 // null_type denotes the end of a list built with "cons"
50 null_type(const null_type&, const null_type&) {}
53 // a helper function to provide a const null_type type temporary
54 inline const null_type cnull_type() { return null_type(); }
56 // forward declaration of tuple
58 typename T1 = null_type,
59 typename T2 = null_type,
60 typename T3 = null_type,
61 typename T4 = null_type,
62 typename T5 = null_type,
63 typename T6 = null_type,
64 typename T7 = null_type,
65 typename T8 = null_type,
66 typename T9 = null_type,
67 typename T10 = null_type
73 // Takes a pointer and routes all assignments to whatever it points to
75 struct assign_to_pointee
78 explicit assign_to_pointee(T* p) : ptr(p) {}
80 template<typename Other>
81 assign_to_pointee& operator=(const Other& other)
91 // Swallows any assignment
95 swallow_assign& operator=(const T&)
101 } // end of namespace detail
103 // cons builds a heterogenous list of types
104 template<typename Head, typename Tail = null_type>
107 typedef cons self_type;
108 typedef Head head_type;
109 typedef Tail tail_type;
114 typename boost::add_reference<head_type>::type get_head() { return head; }
115 typename boost::add_reference<tail_type>::type get_tail() { return tail; }
117 typename boost::add_reference<const head_type>::type get_head() const { return head; }
118 typename boost::add_reference<const tail_type>::type get_tail() const { return tail; }
120 #if defined BOOST_MSVC
121 template<typename Tail>
122 explicit cons(const head_type& h /* = head_type() */, // causes MSVC 6.5 to barf.
123 const Tail& t) : head(h), tail(t.head, t.tail)
127 explicit cons(const head_type& h /* = head_type() */, // causes MSVC 6.5 to barf.
128 const null_type& t) : head(h), tail(t)
134 explicit cons(const head_type& h, const T& t) :
135 head(h), tail(t.head, t.tail)
139 explicit cons(const head_type& h = head_type(),
140 const tail_type& t = tail_type()) :
147 template<typename Other>
148 cons& operator=(const Other& other)
158 // Determines if the parameter is null_type
159 template<typename T> struct is_null_type { enum { RET = 0 }; };
160 template<> struct is_null_type<null_type> { enum { RET = 1 }; };
162 /* Build a cons structure from the given Head and Tail. If both are null_type,
164 template<typename Head, typename Tail>
168 enum { tail_is_null_type = is_null_type<Tail>::RET };
170 typedef cons<Head, Tail> RET;
174 struct build_cons<null_type, null_type>
176 typedef null_type RET;
179 // Map the N elements of a tuple into a cons list
182 typename T2 = null_type,
183 typename T3 = null_type,
184 typename T4 = null_type,
185 typename T5 = null_type,
186 typename T6 = null_type,
187 typename T7 = null_type,
188 typename T8 = null_type,
189 typename T9 = null_type,
190 typename T10 = null_type
192 struct map_tuple_to_cons
194 typedef typename detail::build_cons<T10, null_type >::RET cons10;
195 typedef typename detail::build_cons<T9, cons10>::RET cons9;
196 typedef typename detail::build_cons<T8, cons9>::RET cons8;
197 typedef typename detail::build_cons<T7, cons8>::RET cons7;
198 typedef typename detail::build_cons<T6, cons7>::RET cons6;
199 typedef typename detail::build_cons<T5, cons6>::RET cons5;
200 typedef typename detail::build_cons<T4, cons5>::RET cons4;
201 typedef typename detail::build_cons<T3, cons4>::RET cons3;
202 typedef typename detail::build_cons<T2, cons3>::RET cons2;
203 typedef typename detail::build_cons<T1, cons2>::RET cons1;
206 // Workaround the lack of partial specialization in some compilers
210 template<typename Tuple>
214 typedef typename Tuple::tail_type tail_type;
215 typedef _element_type<N-1> next_elt_type;
218 typedef typename _element_type<N-1>::template inner<tail_type>::RET RET;
223 struct _element_type<0>
225 template<typename Tuple>
228 typedef typename Tuple::head_type RET;
232 } // namespace detail
235 // Return the Nth type of the given Tuple
236 template<int N, typename Tuple>
240 typedef detail::_element_type<N> nth_type;
243 typedef typename nth_type::template inner<Tuple>::RET RET;
249 #if defined(BOOST_MSVC) && (BOOST_MSVC == 1300)
250 // special workaround for vc7:
253 struct reference_adder
263 struct reference_adder<true>
273 // Return a reference to the Nth type of the given Tuple
274 template<int N, typename Tuple>
278 typedef typename element<N, Tuple>::RET elt_type;
279 enum { is_ref = is_reference<elt_type>::value };
282 typedef reference_adder<is_ref>::rebind<elt_type>::type RET;
286 // Return a const reference to the Nth type of the given Tuple
287 template<int N, typename Tuple>
288 struct element_const_ref
291 typedef typename element<N, Tuple>::RET elt_type;
292 enum { is_ref = is_reference<elt_type>::value };
295 typedef reference_adder<is_ref>::rebind<const elt_type>::type RET;
301 // Return a reference to the Nth type of the given Tuple
302 template<int N, typename Tuple>
306 typedef typename element<N, Tuple>::RET elt_type;
309 typedef typename add_reference<elt_type>::type RET;
313 // Return a const reference to the Nth type of the given Tuple
314 template<int N, typename Tuple>
315 struct element_const_ref
318 typedef typename element<N, Tuple>::RET elt_type;
321 typedef typename add_reference<const elt_type>::type RET;
326 } // namespace detail
328 // Get length of this tuple
329 template<typename Tuple>
332 BOOST_STATIC_CONSTANT(int, value = 1 + length<typename Tuple::tail_type>::value);
335 template<> struct length<tuple<> > {
336 BOOST_STATIC_CONSTANT(int, value = 0);
340 struct length<null_type>
342 BOOST_STATIC_CONSTANT(int, value = 0);
347 // Reference the Nth element in a tuple and retrieve it with "get"
351 template<typename Head, typename Tail>
353 typename detail::element_ref<N, cons<Head, Tail> >::RET
354 get(cons<Head, Tail>& t)
356 return get_class<N-1>::get(t.tail);
359 template<typename Head, typename Tail>
361 typename detail::element_const_ref<N, cons<Head, Tail> >::RET
362 get(const cons<Head, Tail>& t)
364 return get_class<N-1>::get(t.tail);
371 template<typename Head, typename Tail>
373 typename add_reference<Head>::type
374 get(cons<Head, Tail>& t)
379 template<typename Head, typename Tail>
381 typename add_reference<const Head>::type
382 get(const cons<Head, Tail>& t)
388 } // namespace detail
404 public detail::map_tuple_to_cons<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10>::cons1
407 typedef detail::map_tuple_to_cons<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10> mapped_tuple;
408 typedef typename mapped_tuple::cons10 cons10;
409 typedef typename mapped_tuple::cons9 cons9;
410 typedef typename mapped_tuple::cons8 cons8;
411 typedef typename mapped_tuple::cons7 cons7;
412 typedef typename mapped_tuple::cons6 cons6;
413 typedef typename mapped_tuple::cons5 cons5;
414 typedef typename mapped_tuple::cons4 cons4;
415 typedef typename mapped_tuple::cons3 cons3;
416 typedef typename mapped_tuple::cons2 cons2;
417 typedef typename mapped_tuple::cons1 cons1;
420 typedef cons1 inherited;
421 typedef tuple self_type;
423 explicit tuple(const T1& t1 = T1(),
432 const T10& t10 = T10()) :
433 cons1(t1, cons2(t2, cons3(t3, cons4(t4, cons5(t5, cons6(t6,cons7(t7,cons8(t8,cons9(t9,cons10(t10))))))))))
437 template<typename Head, typename Tail>
438 explicit tuple(const cons<Head, Tail>& other) :
439 cons1(other.head, other.tail)
443 template<typename First, typename Second>
444 self_type& operator=(const std::pair<First, Second>& other)
446 this->head = other.first;
447 this->tail.head = other.second;
451 template<typename Head, typename Tail>
452 self_type& operator=(const cons<Head, Tail>& other)
454 this->head = other.head;
455 this->tail = other.tail;
463 template<int N> struct workaround_holder {};
465 } // namespace detail
467 template<int N, typename Head, typename Tail>
468 typename detail::element_ref<N, cons<Head, Tail> >::RET
469 get(cons<Head, Tail>& t, detail::workaround_holder<N>* = 0)
471 return detail::get_class<N>::get(t);
474 template<int N, typename Head, typename Tail>
475 typename detail::element_const_ref<N, cons<Head, Tail> >::RET
476 get(const cons<Head, Tail>& t, detail::workaround_holder<N>* = 0)
478 return detail::get_class<N>::get(t);
482 template<typename T1>
485 make_tuple(const T1& t1)
487 return tuple<T1>(t1);
491 template<typename T1, typename T2>
494 make_tuple(const T1& t1, const T2& t2)
496 return tuple<T1, T2>(t1, t2);
500 template<typename T1, typename T2, typename T3>
503 make_tuple(const T1& t1, const T2& t2, const T3& t3)
505 return tuple<T1, T2, T3>(t1, t2, t3);
509 template<typename T1, typename T2, typename T3, typename T4>
511 tuple<T1, T2, T3, T4>
512 make_tuple(const T1& t1, const T2& t2, const T3& t3, const T4& t4)
514 return tuple<T1, T2, T3, T4>(t1, t2, t3, t4);
518 template<typename T1, typename T2, typename T3, typename T4, typename T5>
520 tuple<T1, T2, T3, T4, T5>
521 make_tuple(const T1& t1, const T2& t2, const T3& t3, const T4& t4, const T5& t5)
523 return tuple<T1, T2, T3, T4, T5>(t1, t2, t3, t4, t5);
527 template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6>
529 tuple<T1, T2, T3, T4, T5, T6>
530 make_tuple(const T1& t1, const T2& t2, const T3& t3, const T4& t4, const T5& t5, const T6& t6)
532 return tuple<T1, T2, T3, T4, T5, T6>(t1, t2, t3, t4, t5, t6);
536 template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7>
538 tuple<T1, T2, T3, T4, T5, T6, T7>
539 make_tuple(const T1& t1, const T2& t2, const T3& t3, const T4& t4, const T5& t5, const T6& t6, const T7& t7)
541 return tuple<T1, T2, T3, T4, T5, T6, T7>(t1, t2, t3, t4, t5, t6, t7);
545 template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8>
547 tuple<T1, T2, T3, T4, T5, T6, T7, T8>
548 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)
550 return tuple<T1, T2, T3, T4, T5, T6, T7, T8>(t1, t2, t3, t4, t5, t6, t7, t8);
554 template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8, typename T9>
556 tuple<T1, T2, T3, T4, T5, T6, T7, T8, T9>
557 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)
559 return tuple<T1, T2, T3, T4, T5, T6, T7, T8, T9>(t1, t2, t3, t4, t5, t6, t7, t8, t9);
563 template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8, typename T9, typename T10>
565 tuple<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10>
566 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)
568 return tuple<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10>(t1, t2, t3, t4, t5, t6, t7, t8, t9, t10);
571 // Tie variables into a tuple
572 template<typename T1>
574 tuple<detail::assign_to_pointee<T1> >
577 return make_tuple(detail::assign_to_pointee<T1>(&t1));
580 // Tie variables into a tuple
581 template<typename T1, typename T2>
583 tuple<detail::assign_to_pointee<T1>,
584 detail::assign_to_pointee<T2> >
587 return make_tuple(detail::assign_to_pointee<T1>(&t1),
588 detail::assign_to_pointee<T2>(&t2));
591 // Tie variables into a tuple
592 template<typename T1, typename T2, typename T3>
594 tuple<detail::assign_to_pointee<T1>,
595 detail::assign_to_pointee<T2>,
596 detail::assign_to_pointee<T3> >
597 tie(T1& t1, T2& t2, T3& t3)
599 return make_tuple(detail::assign_to_pointee<T1>(&t1),
600 detail::assign_to_pointee<T2>(&t2),
601 detail::assign_to_pointee<T3>(&t3));
604 // Tie variables into a tuple
605 template<typename T1, typename T2, typename T3, typename T4>
607 tuple<detail::assign_to_pointee<T1>,
608 detail::assign_to_pointee<T2>,
609 detail::assign_to_pointee<T3>,
610 detail::assign_to_pointee<T4> >
611 tie(T1& t1, T2& t2, T3& t3, T4& t4)
613 return make_tuple(detail::assign_to_pointee<T1>(&t1),
614 detail::assign_to_pointee<T2>(&t2),
615 detail::assign_to_pointee<T3>(&t3),
616 detail::assign_to_pointee<T4>(&t4));
619 // Tie variables into a tuple
620 template<typename T1, typename T2, typename T3, typename T4, typename T5>
622 tuple<detail::assign_to_pointee<T1>,
623 detail::assign_to_pointee<T2>,
624 detail::assign_to_pointee<T3>,
625 detail::assign_to_pointee<T4>,
626 detail::assign_to_pointee<T5> >
627 tie(T1& t1, T2& t2, T3& t3, T4& t4, T5 &t5)
629 return make_tuple(detail::assign_to_pointee<T1>(&t1),
630 detail::assign_to_pointee<T2>(&t2),
631 detail::assign_to_pointee<T3>(&t3),
632 detail::assign_to_pointee<T4>(&t4),
633 detail::assign_to_pointee<T5>(&t5));
636 // Tie variables into a tuple
637 template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6>
639 tuple<detail::assign_to_pointee<T1>,
640 detail::assign_to_pointee<T2>,
641 detail::assign_to_pointee<T3>,
642 detail::assign_to_pointee<T4>,
643 detail::assign_to_pointee<T5>,
644 detail::assign_to_pointee<T6> >
645 tie(T1& t1, T2& t2, T3& t3, T4& t4, T5 &t5, T6 &t6)
647 return make_tuple(detail::assign_to_pointee<T1>(&t1),
648 detail::assign_to_pointee<T2>(&t2),
649 detail::assign_to_pointee<T3>(&t3),
650 detail::assign_to_pointee<T4>(&t4),
651 detail::assign_to_pointee<T6>(&t5),
652 detail::assign_to_pointee<T5>(&t6));
655 // Tie variables into a tuple
656 template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7>
658 tuple<detail::assign_to_pointee<T1>,
659 detail::assign_to_pointee<T2>,
660 detail::assign_to_pointee<T3>,
661 detail::assign_to_pointee<T4>,
662 detail::assign_to_pointee<T5>,
663 detail::assign_to_pointee<T6>,
664 detail::assign_to_pointee<T7> >
665 tie(T1& t1, T2& t2, T3& t3, T4& t4, T5 &t5, T6 &t6, T7 &t7)
667 return make_tuple(detail::assign_to_pointee<T1>(&t1),
668 detail::assign_to_pointee<T2>(&t2),
669 detail::assign_to_pointee<T3>(&t3),
670 detail::assign_to_pointee<T4>(&t4),
671 detail::assign_to_pointee<T5>(&t5),
672 detail::assign_to_pointee<T6>(&t6),
673 detail::assign_to_pointee<T7>(&t7));
676 // Tie variables into a tuple
677 template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8>
679 tuple<detail::assign_to_pointee<T1>,
680 detail::assign_to_pointee<T2>,
681 detail::assign_to_pointee<T3>,
682 detail::assign_to_pointee<T4>,
683 detail::assign_to_pointee<T5>,
684 detail::assign_to_pointee<T6>,
685 detail::assign_to_pointee<T7>,
686 detail::assign_to_pointee<T8> >
687 tie(T1& t1, T2& t2, T3& t3, T4& t4, T5 &t5, T6 &t6, T7 &t7, T8 &t8)
689 return make_tuple(detail::assign_to_pointee<T1>(&t1),
690 detail::assign_to_pointee<T2>(&t2),
691 detail::assign_to_pointee<T3>(&t3),
692 detail::assign_to_pointee<T4>(&t4),
693 detail::assign_to_pointee<T5>(&t5),
694 detail::assign_to_pointee<T6>(&t6),
695 detail::assign_to_pointee<T7>(&t7),
696 detail::assign_to_pointee<T8>(&t8));
699 // Tie variables into a tuple
700 template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8, typename T9>
702 tuple<detail::assign_to_pointee<T1>,
703 detail::assign_to_pointee<T2>,
704 detail::assign_to_pointee<T3>,
705 detail::assign_to_pointee<T4>,
706 detail::assign_to_pointee<T5>,
707 detail::assign_to_pointee<T6>,
708 detail::assign_to_pointee<T7>,
709 detail::assign_to_pointee<T8>,
710 detail::assign_to_pointee<T9> >
711 tie(T1& t1, T2& t2, T3& t3, T4& t4, T5 &t5, T6 &t6, T7 &t7, T8 &t8, T9 &t9)
713 return make_tuple(detail::assign_to_pointee<T1>(&t1),
714 detail::assign_to_pointee<T2>(&t2),
715 detail::assign_to_pointee<T3>(&t3),
716 detail::assign_to_pointee<T4>(&t4),
717 detail::assign_to_pointee<T5>(&t5),
718 detail::assign_to_pointee<T6>(&t6),
719 detail::assign_to_pointee<T7>(&t7),
720 detail::assign_to_pointee<T8>(&t8),
721 detail::assign_to_pointee<T9>(&t9));
723 // Tie variables into a tuple
724 template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8, typename T9, typename T10>
726 tuple<detail::assign_to_pointee<T1>,
727 detail::assign_to_pointee<T2>,
728 detail::assign_to_pointee<T3>,
729 detail::assign_to_pointee<T4>,
730 detail::assign_to_pointee<T5>,
731 detail::assign_to_pointee<T6>,
732 detail::assign_to_pointee<T7>,
733 detail::assign_to_pointee<T8>,
734 detail::assign_to_pointee<T9>,
735 detail::assign_to_pointee<T10> >
736 tie(T1& t1, T2& t2, T3& t3, T4& t4, T5 &t5, T6 &t6, T7 &t7, T8 &t8, T9 &t9, T10 &t10)
738 return make_tuple(detail::assign_to_pointee<T1>(&t1),
739 detail::assign_to_pointee<T2>(&t2),
740 detail::assign_to_pointee<T3>(&t3),
741 detail::assign_to_pointee<T4>(&t4),
742 detail::assign_to_pointee<T5>(&t5),
743 detail::assign_to_pointee<T6>(&t6),
744 detail::assign_to_pointee<T7>(&t7),
745 detail::assign_to_pointee<T8>(&t8),
746 detail::assign_to_pointee<T9>(&t9),
747 detail::assign_to_pointee<T10>(&t10));
749 // "ignore" allows tuple positions to be ignored when using "tie".
751 detail::swallow_assign ignore;
754 } // namespace tuples
756 #endif // BOOST_TUPLE_BASIC_NO_PARTIAL_SPEC_HPP