1 // Functor implementations -*- C++ -*-
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39 * Copyright (c) 1996-1998
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43 * and its documentation for any purpose is hereby granted without fee,
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51 /** @file bits/stl_function.h
52 * This is an internal header file, included by other library headers.
53 * Do not attempt to use it directly. @headername{functional}
56 #ifndef _STL_FUNCTION_H
57 #define _STL_FUNCTION_H 1
59 #if __cplusplus > 201103L
60 #include <bits/move.h>
63 namespace std
_GLIBCXX_VISIBILITY(default)
65 _GLIBCXX_BEGIN_NAMESPACE_VERSION
67 // 20.3.1 base classes
68 /** @defgroup functors Function Objects
71 * Function objects, or @e functors, are objects with an @c operator()
72 * defined and accessible. They can be passed as arguments to algorithm
73 * templates and used in place of a function pointer. Not only is the
74 * resulting expressiveness of the library increased, but the generated
75 * code can be more efficient than what you might write by hand. When we
76 * refer to @a functors, then, generally we include function pointers in
77 * the description as well.
79 * Often, functors are only created as temporaries passed to algorithm
80 * calls, rather than being created as named variables.
82 * Two examples taken from the standard itself follow. To perform a
83 * by-element addition of two vectors @c a and @c b containing @c double,
84 * and put the result in @c a, use
86 * transform (a.begin(), a.end(), b.begin(), a.begin(), plus<double>());
88 * To negate every element in @c a, use
90 * transform(a.begin(), a.end(), a.begin(), negate<double>());
92 * The addition and negation functions will be inlined directly.
94 * The standard functors are derived from structs named @c unary_function
95 * and @c binary_function. These two classes contain nothing but typedefs,
96 * to aid in generic (template) programming. If you write your own
97 * functors, you might consider doing the same.
102 * This is one of the @link functors functor base classes@endlink.
104 template<typename _Arg
, typename _Result
>
105 struct unary_function
107 /// @c argument_type is the type of the argument
108 typedef _Arg argument_type
;
110 /// @c result_type is the return type
111 typedef _Result result_type
;
115 * This is one of the @link functors functor base classes@endlink.
117 template<typename _Arg1
, typename _Arg2
, typename _Result
>
118 struct binary_function
120 /// @c first_argument_type is the type of the first argument
121 typedef _Arg1 first_argument_type
;
123 /// @c second_argument_type is the type of the second argument
124 typedef _Arg2 second_argument_type
;
126 /// @c result_type is the return type
127 typedef _Result result_type
;
132 /** @defgroup arithmetic_functors Arithmetic Classes
135 * Because basic math often needs to be done during an algorithm,
136 * the library provides functors for those operations. See the
137 * documentation for @link functors the base classes@endlink
138 * for examples of their use.
143 #if __cplusplus > 201103L
144 struct __is_transparent
; // undefined
146 template<typename _Tp
= void>
149 template<typename _Tp
= void>
152 template<typename _Tp
= void>
155 template<typename _Tp
= void>
158 template<typename _Tp
= void>
161 template<typename _Tp
= void>
165 /// One of the @link arithmetic_functors math functors@endlink.
166 template<typename _Tp
>
167 struct plus
: public binary_function
<_Tp
, _Tp
, _Tp
>
170 operator()(const _Tp
& __x
, const _Tp
& __y
) const
171 { return __x
+ __y
; }
174 /// One of the @link arithmetic_functors math functors@endlink.
175 template<typename _Tp
>
176 struct minus
: public binary_function
<_Tp
, _Tp
, _Tp
>
179 operator()(const _Tp
& __x
, const _Tp
& __y
) const
180 { return __x
- __y
; }
183 /// One of the @link arithmetic_functors math functors@endlink.
184 template<typename _Tp
>
185 struct multiplies
: public binary_function
<_Tp
, _Tp
, _Tp
>
188 operator()(const _Tp
& __x
, const _Tp
& __y
) const
189 { return __x
* __y
; }
192 /// One of the @link arithmetic_functors math functors@endlink.
193 template<typename _Tp
>
194 struct divides
: public binary_function
<_Tp
, _Tp
, _Tp
>
197 operator()(const _Tp
& __x
, const _Tp
& __y
) const
198 { return __x
/ __y
; }
201 /// One of the @link arithmetic_functors math functors@endlink.
202 template<typename _Tp
>
203 struct modulus
: public binary_function
<_Tp
, _Tp
, _Tp
>
206 operator()(const _Tp
& __x
, const _Tp
& __y
) const
207 { return __x
% __y
; }
210 /// One of the @link arithmetic_functors math functors@endlink.
211 template<typename _Tp
>
212 struct negate
: public unary_function
<_Tp
, _Tp
>
215 operator()(const _Tp
& __x
) const
219 #if __cplusplus > 201103L
223 template <typename _Tp
, typename _Up
>
225 operator()(_Tp
&& __t
, _Up
&& __u
) const
226 noexcept(noexcept(std::forward
<_Tp
>(__t
) + std::forward
<_Up
>(__u
)))
227 -> decltype(std::forward
<_Tp
>(__t
) + std::forward
<_Up
>(__u
))
228 { return std::forward
<_Tp
>(__t
) + std::forward
<_Up
>(__u
); }
230 typedef __is_transparent is_transparent
;
233 /// One of the @link arithmetic_functors math functors@endlink.
237 template <typename _Tp
, typename _Up
>
239 operator()(_Tp
&& __t
, _Up
&& __u
) const
240 noexcept(noexcept(std::forward
<_Tp
>(__t
) - std::forward
<_Up
>(__u
)))
241 -> decltype(std::forward
<_Tp
>(__t
) - std::forward
<_Up
>(__u
))
242 { return std::forward
<_Tp
>(__t
) - std::forward
<_Up
>(__u
); }
244 typedef __is_transparent is_transparent
;
247 /// One of the @link arithmetic_functors math functors@endlink.
249 struct multiplies
<void>
251 template <typename _Tp
, typename _Up
>
253 operator()(_Tp
&& __t
, _Up
&& __u
) const
254 noexcept(noexcept(std::forward
<_Tp
>(__t
) * std::forward
<_Up
>(__u
)))
255 -> decltype(std::forward
<_Tp
>(__t
) * std::forward
<_Up
>(__u
))
256 { return std::forward
<_Tp
>(__t
) * std::forward
<_Up
>(__u
); }
258 typedef __is_transparent is_transparent
;
261 /// One of the @link arithmetic_functors math functors@endlink.
265 template <typename _Tp
, typename _Up
>
267 operator()(_Tp
&& __t
, _Up
&& __u
) const
268 noexcept(noexcept(std::forward
<_Tp
>(__t
) / std::forward
<_Up
>(__u
)))
269 -> decltype(std::forward
<_Tp
>(__t
) / std::forward
<_Up
>(__u
))
270 { return std::forward
<_Tp
>(__t
) / std::forward
<_Up
>(__u
); }
272 typedef __is_transparent is_transparent
;
275 /// One of the @link arithmetic_functors math functors@endlink.
279 template <typename _Tp
, typename _Up
>
281 operator()(_Tp
&& __t
, _Up
&& __u
) const
282 noexcept(noexcept(std::forward
<_Tp
>(__t
) % std::forward
<_Up
>(__u
)))
283 -> decltype(std::forward
<_Tp
>(__t
) % std::forward
<_Up
>(__u
))
284 { return std::forward
<_Tp
>(__t
) % std::forward
<_Up
>(__u
); }
286 typedef __is_transparent is_transparent
;
289 /// One of the @link arithmetic_functors math functors@endlink.
293 template <typename _Tp
>
295 operator()(_Tp
&& __t
) const
296 noexcept(noexcept(-std::forward
<_Tp
>(__t
)))
297 -> decltype(-std::forward
<_Tp
>(__t
))
298 { return -std::forward
<_Tp
>(__t
); }
300 typedef __is_transparent is_transparent
;
305 // 20.3.3 comparisons
306 /** @defgroup comparison_functors Comparison Classes
309 * The library provides six wrapper functors for all the basic comparisons
314 #if __cplusplus > 201103L
315 template<typename _Tp
= void>
318 template<typename _Tp
= void>
321 template<typename _Tp
= void>
324 template<typename _Tp
= void>
327 template<typename _Tp
= void>
328 struct greater_equal
;
330 template<typename _Tp
= void>
334 /// One of the @link comparison_functors comparison functors@endlink.
335 template<typename _Tp
>
336 struct equal_to
: public binary_function
<_Tp
, _Tp
, bool>
339 operator()(const _Tp
& __x
, const _Tp
& __y
) const
340 { return __x
== __y
; }
343 /// One of the @link comparison_functors comparison functors@endlink.
344 template<typename _Tp
>
345 struct not_equal_to
: public binary_function
<_Tp
, _Tp
, bool>
348 operator()(const _Tp
& __x
, const _Tp
& __y
) const
349 { return __x
!= __y
; }
352 /// One of the @link comparison_functors comparison functors@endlink.
353 template<typename _Tp
>
354 struct greater
: public binary_function
<_Tp
, _Tp
, bool>
357 operator()(const _Tp
& __x
, const _Tp
& __y
) const
358 { return __x
> __y
; }
361 /// One of the @link comparison_functors comparison functors@endlink.
362 template<typename _Tp
>
363 struct less
: public binary_function
<_Tp
, _Tp
, bool>
366 operator()(const _Tp
& __x
, const _Tp
& __y
) const
367 { return __x
< __y
; }
370 /// One of the @link comparison_functors comparison functors@endlink.
371 template<typename _Tp
>
372 struct greater_equal
: public binary_function
<_Tp
, _Tp
, bool>
375 operator()(const _Tp
& __x
, const _Tp
& __y
) const
376 { return __x
>= __y
; }
379 /// One of the @link comparison_functors comparison functors@endlink.
380 template<typename _Tp
>
381 struct less_equal
: public binary_function
<_Tp
, _Tp
, bool>
384 operator()(const _Tp
& __x
, const _Tp
& __y
) const
385 { return __x
<= __y
; }
388 #if __cplusplus > 201103L
389 /// One of the @link comparison_functors comparison functors@endlink.
391 struct equal_to
<void>
393 template <typename _Tp
, typename _Up
>
395 operator()(_Tp
&& __t
, _Up
&& __u
) const
396 noexcept(noexcept(std::forward
<_Tp
>(__t
) == std::forward
<_Up
>(__u
)))
397 -> decltype(std::forward
<_Tp
>(__t
) == std::forward
<_Up
>(__u
))
398 { return std::forward
<_Tp
>(__t
) == std::forward
<_Up
>(__u
); }
400 typedef __is_transparent is_transparent
;
403 /// One of the @link comparison_functors comparison functors@endlink.
405 struct not_equal_to
<void>
407 template <typename _Tp
, typename _Up
>
409 operator()(_Tp
&& __t
, _Up
&& __u
) const
410 noexcept(noexcept(std::forward
<_Tp
>(__t
) != std::forward
<_Up
>(__u
)))
411 -> decltype(std::forward
<_Tp
>(__t
) != std::forward
<_Up
>(__u
))
412 { return std::forward
<_Tp
>(__t
) != std::forward
<_Up
>(__u
); }
414 typedef __is_transparent is_transparent
;
417 /// One of the @link comparison_functors comparison functors@endlink.
421 template <typename _Tp
, typename _Up
>
423 operator()(_Tp
&& __t
, _Up
&& __u
) const
424 noexcept(noexcept(std::forward
<_Tp
>(__t
) > std::forward
<_Up
>(__u
)))
425 -> decltype(std::forward
<_Tp
>(__t
) > std::forward
<_Up
>(__u
))
426 { return std::forward
<_Tp
>(__t
) > std::forward
<_Up
>(__u
); }
428 typedef __is_transparent is_transparent
;
431 /// One of the @link comparison_functors comparison functors@endlink.
435 template <typename _Tp
, typename _Up
>
437 operator()(_Tp
&& __t
, _Up
&& __u
) const
438 noexcept(noexcept(std::forward
<_Tp
>(__t
) < std::forward
<_Up
>(__u
)))
439 -> decltype(std::forward
<_Tp
>(__t
) < std::forward
<_Up
>(__u
))
440 { return std::forward
<_Tp
>(__t
) < std::forward
<_Up
>(__u
); }
442 typedef __is_transparent is_transparent
;
445 /// One of the @link comparison_functors comparison functors@endlink.
447 struct greater_equal
<void>
449 template <typename _Tp
, typename _Up
>
451 operator()(_Tp
&& __t
, _Up
&& __u
) const
452 noexcept(noexcept(std::forward
<_Tp
>(__t
) >= std::forward
<_Up
>(__u
)))
453 -> decltype(std::forward
<_Tp
>(__t
) >= std::forward
<_Up
>(__u
))
454 { return std::forward
<_Tp
>(__t
) >= std::forward
<_Up
>(__u
); }
456 typedef __is_transparent is_transparent
;
459 /// One of the @link comparison_functors comparison functors@endlink.
461 struct less_equal
<void>
463 template <typename _Tp
, typename _Up
>
465 operator()(_Tp
&& __t
, _Up
&& __u
) const
466 noexcept(noexcept(std::forward
<_Tp
>(__t
) <= std::forward
<_Up
>(__u
)))
467 -> decltype(std::forward
<_Tp
>(__t
) <= std::forward
<_Up
>(__u
))
468 { return std::forward
<_Tp
>(__t
) <= std::forward
<_Up
>(__u
); }
470 typedef __is_transparent is_transparent
;
475 // 20.3.4 logical operations
476 /** @defgroup logical_functors Boolean Operations Classes
479 * Here are wrapper functors for Boolean operations: @c &&, @c ||,
484 #if __cplusplus > 201103L
485 template<typename _Tp
= void>
488 template<typename _Tp
= void>
491 template<typename _Tp
= void>
495 /// One of the @link logical_functors Boolean operations functors@endlink.
496 template<typename _Tp
>
497 struct logical_and
: public binary_function
<_Tp
, _Tp
, bool>
500 operator()(const _Tp
& __x
, const _Tp
& __y
) const
501 { return __x
&& __y
; }
504 /// One of the @link logical_functors Boolean operations functors@endlink.
505 template<typename _Tp
>
506 struct logical_or
: public binary_function
<_Tp
, _Tp
, bool>
509 operator()(const _Tp
& __x
, const _Tp
& __y
) const
510 { return __x
|| __y
; }
513 /// One of the @link logical_functors Boolean operations functors@endlink.
514 template<typename _Tp
>
515 struct logical_not
: public unary_function
<_Tp
, bool>
518 operator()(const _Tp
& __x
) const
522 #if __cplusplus > 201103L
523 /// One of the @link logical_functors Boolean operations functors@endlink.
525 struct logical_and
<void>
527 template <typename _Tp
, typename _Up
>
529 operator()(_Tp
&& __t
, _Up
&& __u
) const
530 noexcept(noexcept(std::forward
<_Tp
>(__t
) && std::forward
<_Up
>(__u
)))
531 -> decltype(std::forward
<_Tp
>(__t
) && std::forward
<_Up
>(__u
))
532 { return std::forward
<_Tp
>(__t
) && std::forward
<_Up
>(__u
); }
534 typedef __is_transparent is_transparent
;
537 /// One of the @link logical_functors Boolean operations functors@endlink.
539 struct logical_or
<void>
541 template <typename _Tp
, typename _Up
>
543 operator()(_Tp
&& __t
, _Up
&& __u
) const
544 noexcept(noexcept(std::forward
<_Tp
>(__t
) || std::forward
<_Up
>(__u
)))
545 -> decltype(std::forward
<_Tp
>(__t
) || std::forward
<_Up
>(__u
))
546 { return std::forward
<_Tp
>(__t
) || std::forward
<_Up
>(__u
); }
548 typedef __is_transparent is_transparent
;
551 /// One of the @link logical_functors Boolean operations functors@endlink.
553 struct logical_not
<void>
555 template <typename _Tp
>
557 operator()(_Tp
&& __t
) const
558 noexcept(noexcept(!std::forward
<_Tp
>(__t
)))
559 -> decltype(!std::forward
<_Tp
>(__t
))
560 { return !std::forward
<_Tp
>(__t
); }
562 typedef __is_transparent is_transparent
;
567 #if __cplusplus > 201103L
568 template<typename _Tp
= void>
571 template<typename _Tp
= void>
574 template<typename _Tp
= void>
577 template<typename _Tp
= void>
581 // _GLIBCXX_RESOLVE_LIB_DEFECTS
582 // DR 660. Missing Bitwise Operations.
583 template<typename _Tp
>
584 struct bit_and
: public binary_function
<_Tp
, _Tp
, _Tp
>
587 operator()(const _Tp
& __x
, const _Tp
& __y
) const
588 { return __x
& __y
; }
591 template<typename _Tp
>
592 struct bit_or
: public binary_function
<_Tp
, _Tp
, _Tp
>
595 operator()(const _Tp
& __x
, const _Tp
& __y
) const
596 { return __x
| __y
; }
599 template<typename _Tp
>
600 struct bit_xor
: public binary_function
<_Tp
, _Tp
, _Tp
>
603 operator()(const _Tp
& __x
, const _Tp
& __y
) const
604 { return __x
^ __y
; }
607 template<typename _Tp
>
608 struct bit_not
: public unary_function
<_Tp
, _Tp
>
611 operator()(const _Tp
& __x
) const
615 #if __cplusplus > 201103L
619 template <typename _Tp
, typename _Up
>
621 operator()(_Tp
&& __t
, _Up
&& __u
) const
622 noexcept(noexcept(std::forward
<_Tp
>(__t
) & std::forward
<_Up
>(__u
)))
623 -> decltype(std::forward
<_Tp
>(__t
) & std::forward
<_Up
>(__u
))
624 { return std::forward
<_Tp
>(__t
) & std::forward
<_Up
>(__u
); }
626 typedef __is_transparent is_transparent
;
632 template <typename _Tp
, typename _Up
>
634 operator()(_Tp
&& __t
, _Up
&& __u
) const
635 noexcept(noexcept(std::forward
<_Tp
>(__t
) | std::forward
<_Up
>(__u
)))
636 -> decltype(std::forward
<_Tp
>(__t
) | std::forward
<_Up
>(__u
))
637 { return std::forward
<_Tp
>(__t
) | std::forward
<_Up
>(__u
); }
639 typedef __is_transparent is_transparent
;
645 template <typename _Tp
, typename _Up
>
647 operator()(_Tp
&& __t
, _Up
&& __u
) const
648 noexcept(noexcept(std::forward
<_Tp
>(__t
) ^ std::forward
<_Up
>(__u
)))
649 -> decltype(std::forward
<_Tp
>(__t
) ^ std::forward
<_Up
>(__u
))
650 { return std::forward
<_Tp
>(__t
) ^ std::forward
<_Up
>(__u
); }
652 typedef __is_transparent is_transparent
;
658 template <typename _Tp
>
660 operator()(_Tp
&& __t
) const
661 noexcept(noexcept(~std::forward
<_Tp
>(__t
)))
662 -> decltype(~std::forward
<_Tp
>(__t
))
663 { return ~std::forward
<_Tp
>(__t
); }
665 typedef __is_transparent is_transparent
;
670 /** @defgroup negators Negators
673 * The functions @c not1 and @c not2 each take a predicate functor
674 * and return an instance of @c unary_negate or
675 * @c binary_negate, respectively. These classes are functors whose
676 * @c operator() performs the stored predicate function and then returns
677 * the negation of the result.
679 * For example, given a vector of integers and a trivial predicate,
681 * struct IntGreaterThanThree
682 * : public std::unary_function<int, bool>
684 * bool operator() (int x) { return x > 3; }
687 * std::find_if (v.begin(), v.end(), not1(IntGreaterThanThree()));
689 * The call to @c find_if will locate the first index (i) of @c v for which
690 * <code>!(v[i] > 3)</code> is true.
692 * The not1/unary_negate combination works on predicates taking a single
693 * argument. The not2/binary_negate combination works on predicates which
694 * take two arguments.
698 /// One of the @link negators negation functors@endlink.
699 template<typename _Predicate
>
701 : public unary_function
<typename
_Predicate::argument_type
, bool>
708 unary_negate(const _Predicate
& __x
) : _M_pred(__x
) { }
711 operator()(const typename
_Predicate::argument_type
& __x
) const
712 { return !_M_pred(__x
); }
715 /// One of the @link negators negation functors@endlink.
716 template<typename _Predicate
>
717 inline unary_negate
<_Predicate
>
718 not1(const _Predicate
& __pred
)
719 { return unary_negate
<_Predicate
>(__pred
); }
721 /// One of the @link negators negation functors@endlink.
722 template<typename _Predicate
>
724 : public binary_function
<typename
_Predicate::first_argument_type
,
725 typename
_Predicate::second_argument_type
, bool>
732 binary_negate(const _Predicate
& __x
) : _M_pred(__x
) { }
735 operator()(const typename
_Predicate::first_argument_type
& __x
,
736 const typename
_Predicate::second_argument_type
& __y
) const
737 { return !_M_pred(__x
, __y
); }
740 /// One of the @link negators negation functors@endlink.
741 template<typename _Predicate
>
742 inline binary_negate
<_Predicate
>
743 not2(const _Predicate
& __pred
)
744 { return binary_negate
<_Predicate
>(__pred
); }
747 // 20.3.7 adaptors pointers functions
748 /** @defgroup pointer_adaptors Adaptors for pointers to functions
751 * The advantage of function objects over pointers to functions is that
752 * the objects in the standard library declare nested typedefs describing
753 * their argument and result types with uniform names (e.g., @c result_type
754 * from the base classes @c unary_function and @c binary_function).
755 * Sometimes those typedefs are required, not just optional.
757 * Adaptors are provided to turn pointers to unary (single-argument) and
758 * binary (double-argument) functions into function objects. The
759 * long-winded functor @c pointer_to_unary_function is constructed with a
760 * function pointer @c f, and its @c operator() called with argument @c x
761 * returns @c f(x). The functor @c pointer_to_binary_function does the same
762 * thing, but with a double-argument @c f and @c operator().
764 * The function @c ptr_fun takes a pointer-to-function @c f and constructs
765 * an instance of the appropriate functor.
769 /// One of the @link pointer_adaptors adaptors for function pointers@endlink.
770 template<typename _Arg
, typename _Result
>
771 class pointer_to_unary_function
: public unary_function
<_Arg
, _Result
>
774 _Result (*_M_ptr
)(_Arg
);
777 pointer_to_unary_function() { }
780 pointer_to_unary_function(_Result (*__x
)(_Arg
))
784 operator()(_Arg __x
) const
785 { return _M_ptr(__x
); }
788 /// One of the @link pointer_adaptors adaptors for function pointers@endlink.
789 template<typename _Arg
, typename _Result
>
790 inline pointer_to_unary_function
<_Arg
, _Result
>
791 ptr_fun(_Result (*__x
)(_Arg
))
792 { return pointer_to_unary_function
<_Arg
, _Result
>(__x
); }
794 /// One of the @link pointer_adaptors adaptors for function pointers@endlink.
795 template<typename _Arg1
, typename _Arg2
, typename _Result
>
796 class pointer_to_binary_function
797 : public binary_function
<_Arg1
, _Arg2
, _Result
>
800 _Result (*_M_ptr
)(_Arg1
, _Arg2
);
803 pointer_to_binary_function() { }
806 pointer_to_binary_function(_Result (*__x
)(_Arg1
, _Arg2
))
810 operator()(_Arg1 __x
, _Arg2 __y
) const
811 { return _M_ptr(__x
, __y
); }
814 /// One of the @link pointer_adaptors adaptors for function pointers@endlink.
815 template<typename _Arg1
, typename _Arg2
, typename _Result
>
816 inline pointer_to_binary_function
<_Arg1
, _Arg2
, _Result
>
817 ptr_fun(_Result (*__x
)(_Arg1
, _Arg2
))
818 { return pointer_to_binary_function
<_Arg1
, _Arg2
, _Result
>(__x
); }
821 template<typename _Tp
>
823 : public unary_function
<_Tp
,_Tp
>
826 operator()(_Tp
& __x
) const
830 operator()(const _Tp
& __x
) const
834 template<typename _Pair
>
836 : public unary_function
<_Pair
, typename
_Pair::first_type
>
838 typename
_Pair::first_type
&
839 operator()(_Pair
& __x
) const
840 { return __x
.first
; }
842 const typename
_Pair::first_type
&
843 operator()(const _Pair
& __x
) const
844 { return __x
.first
; }
846 #if __cplusplus >= 201103L
847 template<typename _Pair2
>
848 typename
_Pair2::first_type
&
849 operator()(_Pair2
& __x
) const
850 { return __x
.first
; }
852 template<typename _Pair2
>
853 const typename
_Pair2::first_type
&
854 operator()(const _Pair2
& __x
) const
855 { return __x
.first
; }
859 template<typename _Pair
>
861 : public unary_function
<_Pair
, typename
_Pair::second_type
>
863 typename
_Pair::second_type
&
864 operator()(_Pair
& __x
) const
865 { return __x
.second
; }
867 const typename
_Pair::second_type
&
868 operator()(const _Pair
& __x
) const
869 { return __x
.second
; }
872 // 20.3.8 adaptors pointers members
873 /** @defgroup memory_adaptors Adaptors for pointers to members
876 * There are a total of 8 = 2^3 function objects in this family.
877 * (1) Member functions taking no arguments vs member functions taking
879 * (2) Call through pointer vs call through reference.
880 * (3) Const vs non-const member function.
882 * All of this complexity is in the function objects themselves. You can
883 * ignore it by using the helper function mem_fun and mem_fun_ref,
884 * which create whichever type of adaptor is appropriate.
888 /// One of the @link memory_adaptors adaptors for member
889 /// pointers@endlink.
890 template<typename _Ret
, typename _Tp
>
891 class mem_fun_t
: public unary_function
<_Tp
*, _Ret
>
895 mem_fun_t(_Ret (_Tp::*__pf
)())
899 operator()(_Tp
* __p
) const
900 { return (__p
->*_M_f
)(); }
906 /// One of the @link memory_adaptors adaptors for member
907 /// pointers@endlink.
908 template<typename _Ret
, typename _Tp
>
909 class const_mem_fun_t
: public unary_function
<const _Tp
*, _Ret
>
913 const_mem_fun_t(_Ret (_Tp::*__pf
)() const)
917 operator()(const _Tp
* __p
) const
918 { return (__p
->*_M_f
)(); }
921 _Ret (_Tp::*_M_f
)() const;
924 /// One of the @link memory_adaptors adaptors for member
925 /// pointers@endlink.
926 template<typename _Ret
, typename _Tp
>
927 class mem_fun_ref_t
: public unary_function
<_Tp
, _Ret
>
931 mem_fun_ref_t(_Ret (_Tp::*__pf
)())
935 operator()(_Tp
& __r
) const
936 { return (__r
.*_M_f
)(); }
942 /// One of the @link memory_adaptors adaptors for member
943 /// pointers@endlink.
944 template<typename _Ret
, typename _Tp
>
945 class const_mem_fun_ref_t
: public unary_function
<_Tp
, _Ret
>
949 const_mem_fun_ref_t(_Ret (_Tp::*__pf
)() const)
953 operator()(const _Tp
& __r
) const
954 { return (__r
.*_M_f
)(); }
957 _Ret (_Tp::*_M_f
)() const;
960 /// One of the @link memory_adaptors adaptors for member
961 /// pointers@endlink.
962 template<typename _Ret
, typename _Tp
, typename _Arg
>
963 class mem_fun1_t
: public binary_function
<_Tp
*, _Arg
, _Ret
>
967 mem_fun1_t(_Ret (_Tp::*__pf
)(_Arg
))
971 operator()(_Tp
* __p
, _Arg __x
) const
972 { return (__p
->*_M_f
)(__x
); }
975 _Ret (_Tp::*_M_f
)(_Arg
);
978 /// One of the @link memory_adaptors adaptors for member
979 /// pointers@endlink.
980 template<typename _Ret
, typename _Tp
, typename _Arg
>
981 class const_mem_fun1_t
: public binary_function
<const _Tp
*, _Arg
, _Ret
>
985 const_mem_fun1_t(_Ret (_Tp::*__pf
)(_Arg
) const)
989 operator()(const _Tp
* __p
, _Arg __x
) const
990 { return (__p
->*_M_f
)(__x
); }
993 _Ret (_Tp::*_M_f
)(_Arg
) const;
996 /// One of the @link memory_adaptors adaptors for member
997 /// pointers@endlink.
998 template<typename _Ret
, typename _Tp
, typename _Arg
>
999 class mem_fun1_ref_t
: public binary_function
<_Tp
, _Arg
, _Ret
>
1003 mem_fun1_ref_t(_Ret (_Tp::*__pf
)(_Arg
))
1007 operator()(_Tp
& __r
, _Arg __x
) const
1008 { return (__r
.*_M_f
)(__x
); }
1011 _Ret (_Tp::*_M_f
)(_Arg
);
1014 /// One of the @link memory_adaptors adaptors for member
1015 /// pointers@endlink.
1016 template<typename _Ret
, typename _Tp
, typename _Arg
>
1017 class const_mem_fun1_ref_t
: public binary_function
<_Tp
, _Arg
, _Ret
>
1021 const_mem_fun1_ref_t(_Ret (_Tp::*__pf
)(_Arg
) const)
1025 operator()(const _Tp
& __r
, _Arg __x
) const
1026 { return (__r
.*_M_f
)(__x
); }
1029 _Ret (_Tp::*_M_f
)(_Arg
) const;
1032 // Mem_fun adaptor helper functions. There are only two:
1033 // mem_fun and mem_fun_ref.
1034 template<typename _Ret
, typename _Tp
>
1035 inline mem_fun_t
<_Ret
, _Tp
>
1036 mem_fun(_Ret (_Tp::*__f
)())
1037 { return mem_fun_t
<_Ret
, _Tp
>(__f
); }
1039 template<typename _Ret
, typename _Tp
>
1040 inline const_mem_fun_t
<_Ret
, _Tp
>
1041 mem_fun(_Ret (_Tp::*__f
)() const)
1042 { return const_mem_fun_t
<_Ret
, _Tp
>(__f
); }
1044 template<typename _Ret
, typename _Tp
>
1045 inline mem_fun_ref_t
<_Ret
, _Tp
>
1046 mem_fun_ref(_Ret (_Tp::*__f
)())
1047 { return mem_fun_ref_t
<_Ret
, _Tp
>(__f
); }
1049 template<typename _Ret
, typename _Tp
>
1050 inline const_mem_fun_ref_t
<_Ret
, _Tp
>
1051 mem_fun_ref(_Ret (_Tp::*__f
)() const)
1052 { return const_mem_fun_ref_t
<_Ret
, _Tp
>(__f
); }
1054 template<typename _Ret
, typename _Tp
, typename _Arg
>
1055 inline mem_fun1_t
<_Ret
, _Tp
, _Arg
>
1056 mem_fun(_Ret (_Tp::*__f
)(_Arg
))
1057 { return mem_fun1_t
<_Ret
, _Tp
, _Arg
>(__f
); }
1059 template<typename _Ret
, typename _Tp
, typename _Arg
>
1060 inline const_mem_fun1_t
<_Ret
, _Tp
, _Arg
>
1061 mem_fun(_Ret (_Tp::*__f
)(_Arg
) const)
1062 { return const_mem_fun1_t
<_Ret
, _Tp
, _Arg
>(__f
); }
1064 template<typename _Ret
, typename _Tp
, typename _Arg
>
1065 inline mem_fun1_ref_t
<_Ret
, _Tp
, _Arg
>
1066 mem_fun_ref(_Ret (_Tp::*__f
)(_Arg
))
1067 { return mem_fun1_ref_t
<_Ret
, _Tp
, _Arg
>(__f
); }
1069 template<typename _Ret
, typename _Tp
, typename _Arg
>
1070 inline const_mem_fun1_ref_t
<_Ret
, _Tp
, _Arg
>
1071 mem_fun_ref(_Ret (_Tp::*__f
)(_Arg
) const)
1072 { return const_mem_fun1_ref_t
<_Ret
, _Tp
, _Arg
>(__f
); }
1076 _GLIBCXX_END_NAMESPACE_VERSION
1079 #if (__cplusplus < 201103L) || _GLIBCXX_USE_DEPRECATED
1080 # include <backward/binders.h>
1083 #endif /* _STL_FUNCTION_H */