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+// Functor implementations -*- C++ -*-
+
+// Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2009, 2010,
+// 2011, 2012
+// Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
+// .
+
+/*
+ *
+ * Copyright (c) 1994
+ * Hewlett-Packard Company
+ *
+ * Permission to use, copy, modify, distribute and sell this software
+ * and its documentation for any purpose is hereby granted without fee,
+ * provided that the above copyright notice appear in all copies and
+ * that both that copyright notice and this permission notice appear
+ * in supporting documentation. Hewlett-Packard Company makes no
+ * representations about the suitability of this software for any
+ * purpose. It is provided "as is" without express or implied warranty.
+ *
+ *
+ * Copyright (c) 1996-1998
+ * Silicon Graphics Computer Systems, Inc.
+ *
+ * Permission to use, copy, modify, distribute and sell this software
+ * and its documentation for any purpose is hereby granted without fee,
+ * provided that the above copyright notice appear in all copies and
+ * that both that copyright notice and this permission notice appear
+ * in supporting documentation. Silicon Graphics makes no
+ * representations about the suitability of this software for any
+ * purpose. It is provided "as is" without express or implied warranty.
+ */
+
+/** @file bits/stl_function.h
+ * This is an internal header file, included by other library headers.
+ * Do not attempt to use it directly. @headername{functional}
+ */
+
+#ifndef _STL_FUNCTION_H
+#define _STL_FUNCTION_H 1
+
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+ // 20.3.1 base classes
+ /** @defgroup functors Function Objects
+ * @ingroup utilities
+ *
+ * Function objects, or @e functors, are objects with an @c operator()
+ * defined and accessible. They can be passed as arguments to algorithm
+ * templates and used in place of a function pointer. Not only is the
+ * resulting expressiveness of the library increased, but the generated
+ * code can be more efficient than what you might write by hand. When we
+ * refer to @a functors, then, generally we include function pointers in
+ * the description as well.
+ *
+ * Often, functors are only created as temporaries passed to algorithm
+ * calls, rather than being created as named variables.
+ *
+ * Two examples taken from the standard itself follow. To perform a
+ * by-element addition of two vectors @c a and @c b containing @c double,
+ * and put the result in @c a, use
+ * \code
+ * transform (a.begin(), a.end(), b.begin(), a.begin(), plus());
+ * \endcode
+ * To negate every element in @c a, use
+ * \code
+ * transform(a.begin(), a.end(), a.begin(), negate());
+ * \endcode
+ * The addition and negation functions will be inlined directly.
+ *
+ * The standard functors are derived from structs named @c unary_function
+ * and @c binary_function. These two classes contain nothing but typedefs,
+ * to aid in generic (template) programming. If you write your own
+ * functors, you might consider doing the same.
+ *
+ * @{
+ */
+ /**
+ * This is one of the @link functors functor base classes@endlink.
+ */
+ template
+ struct unary_function
+ {
+ /// @c argument_type is the type of the argument
+ typedef _Arg argument_type;
+
+ /// @c result_type is the return type
+ typedef _Result result_type;
+ };
+
+ /**
+ * This is one of the @link functors functor base classes@endlink.
+ */
+ template
+ struct binary_function
+ {
+ /// @c first_argument_type is the type of the first argument
+ typedef _Arg1 first_argument_type;
+
+ /// @c second_argument_type is the type of the second argument
+ typedef _Arg2 second_argument_type;
+
+ /// @c result_type is the return type
+ typedef _Result result_type;
+ };
+ /** @} */
+
+ // 20.3.2 arithmetic
+ /** @defgroup arithmetic_functors Arithmetic Classes
+ * @ingroup functors
+ *
+ * Because basic math often needs to be done during an algorithm,
+ * the library provides functors for those operations. See the
+ * documentation for @link functors the base classes@endlink
+ * for examples of their use.
+ *
+ * @{
+ */
+ /// One of the @link arithmetic_functors math functors@endlink.
+ template
+ struct plus : public binary_function<_Tp, _Tp, _Tp>
+ {
+ _Tp
+ operator()(const _Tp& __x, const _Tp& __y) const
+ { return __x + __y; }
+ };
+
+ /// One of the @link arithmetic_functors math functors@endlink.
+ template
+ struct minus : public binary_function<_Tp, _Tp, _Tp>
+ {
+ _Tp
+ operator()(const _Tp& __x, const _Tp& __y) const
+ { return __x - __y; }
+ };
+
+ /// One of the @link arithmetic_functors math functors@endlink.
+ template
+ struct multiplies : public binary_function<_Tp, _Tp, _Tp>
+ {
+ _Tp
+ operator()(const _Tp& __x, const _Tp& __y) const
+ { return __x * __y; }
+ };
+
+ /// One of the @link arithmetic_functors math functors@endlink.
+ template
+ struct divides : public binary_function<_Tp, _Tp, _Tp>
+ {
+ _Tp
+ operator()(const _Tp& __x, const _Tp& __y) const
+ { return __x / __y; }
+ };
+
+ /// One of the @link arithmetic_functors math functors@endlink.
+ template
+ struct modulus : public binary_function<_Tp, _Tp, _Tp>
+ {
+ _Tp
+ operator()(const _Tp& __x, const _Tp& __y) const
+ { return __x % __y; }
+ };
+
+ /// One of the @link arithmetic_functors math functors@endlink.
+ template
+ struct negate : public unary_function<_Tp, _Tp>
+ {
+ _Tp
+ operator()(const _Tp& __x) const
+ { return -__x; }
+ };
+ /** @} */
+
+ // 20.3.3 comparisons
+ /** @defgroup comparison_functors Comparison Classes
+ * @ingroup functors
+ *
+ * The library provides six wrapper functors for all the basic comparisons
+ * in C++, like @c <.
+ *
+ * @{
+ */
+ /// One of the @link comparison_functors comparison functors@endlink.
+ template
+ struct equal_to : public binary_function<_Tp, _Tp, bool>
+ {
+ bool
+ operator()(const _Tp& __x, const _Tp& __y) const
+ { return __x == __y; }
+ };
+
+ /// One of the @link comparison_functors comparison functors@endlink.
+ template
+ struct not_equal_to : public binary_function<_Tp, _Tp, bool>
+ {
+ bool
+ operator()(const _Tp& __x, const _Tp& __y) const
+ { return __x != __y; }
+ };
+
+ /// One of the @link comparison_functors comparison functors@endlink.
+ template
+ struct greater : public binary_function<_Tp, _Tp, bool>
+ {
+ bool
+ operator()(const _Tp& __x, const _Tp& __y) const
+ { return __x > __y; }
+ };
+
+ /// One of the @link comparison_functors comparison functors@endlink.
+ template
+ struct less : public binary_function<_Tp, _Tp, bool>
+ {
+ bool
+ operator()(const _Tp& __x, const _Tp& __y) const
+ { return __x < __y; }
+ };
+
+ /// One of the @link comparison_functors comparison functors@endlink.
+ template
+ struct greater_equal : public binary_function<_Tp, _Tp, bool>
+ {
+ bool
+ operator()(const _Tp& __x, const _Tp& __y) const
+ { return __x >= __y; }
+ };
+
+ /// One of the @link comparison_functors comparison functors@endlink.
+ template
+ struct less_equal : public binary_function<_Tp, _Tp, bool>
+ {
+ bool
+ operator()(const _Tp& __x, const _Tp& __y) const
+ { return __x <= __y; }
+ };
+ /** @} */
+
+ // 20.3.4 logical operations
+ /** @defgroup logical_functors Boolean Operations Classes
+ * @ingroup functors
+ *
+ * Here are wrapper functors for Boolean operations: @c &&, @c ||,
+ * and @c !.
+ *
+ * @{
+ */
+ /// One of the @link logical_functors Boolean operations functors@endlink.
+ template
+ struct logical_and : public binary_function<_Tp, _Tp, bool>
+ {
+ bool
+ operator()(const _Tp& __x, const _Tp& __y) const
+ { return __x && __y; }
+ };
+
+ /// One of the @link logical_functors Boolean operations functors@endlink.
+ template
+ struct logical_or : public binary_function<_Tp, _Tp, bool>
+ {
+ bool
+ operator()(const _Tp& __x, const _Tp& __y) const
+ { return __x || __y; }
+ };
+
+ /// One of the @link logical_functors Boolean operations functors@endlink.
+ template
+ struct logical_not : public unary_function<_Tp, bool>
+ {
+ bool
+ operator()(const _Tp& __x) const
+ { return !__x; }
+ };
+ /** @} */
+
+ // _GLIBCXX_RESOLVE_LIB_DEFECTS
+ // DR 660. Missing Bitwise Operations.
+ template
+ struct bit_and : public binary_function<_Tp, _Tp, _Tp>
+ {
+ _Tp
+ operator()(const _Tp& __x, const _Tp& __y) const
+ { return __x & __y; }
+ };
+
+ template
+ struct bit_or : public binary_function<_Tp, _Tp, _Tp>
+ {
+ _Tp
+ operator()(const _Tp& __x, const _Tp& __y) const
+ { return __x | __y; }
+ };
+
+ template
+ struct bit_xor : public binary_function<_Tp, _Tp, _Tp>
+ {
+ _Tp
+ operator()(const _Tp& __x, const _Tp& __y) const
+ { return __x ^ __y; }
+ };
+
+ // 20.3.5 negators
+ /** @defgroup negators Negators
+ * @ingroup functors
+ *
+ * The functions @c not1 and @c not2 each take a predicate functor
+ * and return an instance of @c unary_negate or
+ * @c binary_negate, respectively. These classes are functors whose
+ * @c operator() performs the stored predicate function and then returns
+ * the negation of the result.
+ *
+ * For example, given a vector of integers and a trivial predicate,
+ * \code
+ * struct IntGreaterThanThree
+ * : public std::unary_function
+ * {
+ * bool operator() (int x) { return x > 3; }
+ * };
+ *
+ * std::find_if (v.begin(), v.end(), not1(IntGreaterThanThree()));
+ * \endcode
+ * The call to @c find_if will locate the first index (i) of @c v for which
+ * !(v[i] > 3) is true.
+ *
+ * The not1/unary_negate combination works on predicates taking a single
+ * argument. The not2/binary_negate combination works on predicates which
+ * take two arguments.
+ *
+ * @{
+ */
+ /// One of the @link negators negation functors@endlink.
+ template
+ class unary_negate
+ : public unary_function
+ {
+ protected:
+ _Predicate _M_pred;
+
+ public:
+ explicit
+ unary_negate(const _Predicate& __x) : _M_pred(__x) { }
+
+ bool
+ operator()(const typename _Predicate::argument_type& __x) const
+ { return !_M_pred(__x); }
+ };
+
+ /// One of the @link negators negation functors@endlink.
+ template
+ inline unary_negate<_Predicate>
+ not1(const _Predicate& __pred)
+ { return unary_negate<_Predicate>(__pred); }
+
+ /// One of the @link negators negation functors@endlink.
+ template
+ class binary_negate
+ : public binary_function
+ {
+ protected:
+ _Predicate _M_pred;
+
+ public:
+ explicit
+ binary_negate(const _Predicate& __x) : _M_pred(__x) { }
+
+ bool
+ operator()(const typename _Predicate::first_argument_type& __x,
+ const typename _Predicate::second_argument_type& __y) const
+ { return !_M_pred(__x, __y); }
+ };
+
+ /// One of the @link negators negation functors@endlink.
+ template
+ inline binary_negate<_Predicate>
+ not2(const _Predicate& __pred)
+ { return binary_negate<_Predicate>(__pred); }
+ /** @} */
+
+ // 20.3.7 adaptors pointers functions
+ /** @defgroup pointer_adaptors Adaptors for pointers to functions
+ * @ingroup functors
+ *
+ * The advantage of function objects over pointers to functions is that
+ * the objects in the standard library declare nested typedefs describing
+ * their argument and result types with uniform names (e.g., @c result_type
+ * from the base classes @c unary_function and @c binary_function).
+ * Sometimes those typedefs are required, not just optional.
+ *
+ * Adaptors are provided to turn pointers to unary (single-argument) and
+ * binary (double-argument) functions into function objects. The
+ * long-winded functor @c pointer_to_unary_function is constructed with a
+ * function pointer @c f, and its @c operator() called with argument @c x
+ * returns @c f(x). The functor @c pointer_to_binary_function does the same
+ * thing, but with a double-argument @c f and @c operator().
+ *
+ * The function @c ptr_fun takes a pointer-to-function @c f and constructs
+ * an instance of the appropriate functor.
+ *
+ * @{
+ */
+ /// One of the @link pointer_adaptors adaptors for function pointers@endlink.
+ template
+ class pointer_to_unary_function : public unary_function<_Arg, _Result>
+ {
+ protected:
+ _Result (*_M_ptr)(_Arg);
+
+ public:
+ pointer_to_unary_function() { }
+
+ explicit
+ pointer_to_unary_function(_Result (*__x)(_Arg))
+ : _M_ptr(__x) { }
+
+ _Result
+ operator()(_Arg __x) const
+ { return _M_ptr(__x); }
+ };
+
+ /// One of the @link pointer_adaptors adaptors for function pointers@endlink.
+ template
+ inline pointer_to_unary_function<_Arg, _Result>
+ ptr_fun(_Result (*__x)(_Arg))
+ { return pointer_to_unary_function<_Arg, _Result>(__x); }
+
+ /// One of the @link pointer_adaptors adaptors for function pointers@endlink.
+ template
+ class pointer_to_binary_function
+ : public binary_function<_Arg1, _Arg2, _Result>
+ {
+ protected:
+ _Result (*_M_ptr)(_Arg1, _Arg2);
+
+ public:
+ pointer_to_binary_function() { }
+
+ explicit
+ pointer_to_binary_function(_Result (*__x)(_Arg1, _Arg2))
+ : _M_ptr(__x) { }
+
+ _Result
+ operator()(_Arg1 __x, _Arg2 __y) const
+ { return _M_ptr(__x, __y); }
+ };
+
+ /// One of the @link pointer_adaptors adaptors for function pointers@endlink.
+ template
+ inline pointer_to_binary_function<_Arg1, _Arg2, _Result>
+ ptr_fun(_Result (*__x)(_Arg1, _Arg2))
+ { return pointer_to_binary_function<_Arg1, _Arg2, _Result>(__x); }
+ /** @} */
+
+ template
+ struct _Identity
+#ifndef __GXX_EXPERIMENTAL_CXX0X__
+ // unary_function itself is deprecated in C++11 and deriving from
+ // it can even be a nuisance (see PR 52942).
+ : public unary_function<_Tp,_Tp>
+#endif
+ {
+ _Tp&
+ operator()(_Tp& __x) const
+ { return __x; }
+
+ const _Tp&
+ operator()(const _Tp& __x) const
+ { return __x; }
+ };
+
+ template
+ struct _Select1st
+#ifndef __GXX_EXPERIMENTAL_CXX0X__
+ : public unary_function<_Pair, typename _Pair::first_type>
+#endif
+ {
+ typename _Pair::first_type&
+ operator()(_Pair& __x) const
+ { return __x.first; }
+
+ const typename _Pair::first_type&
+ operator()(const _Pair& __x) const
+ { return __x.first; }
+
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+ template
+ typename _Pair2::first_type&
+ operator()(_Pair2& __x) const
+ { return __x.first; }
+
+ template
+ const typename _Pair2::first_type&
+ operator()(const _Pair2& __x) const
+ { return __x.first; }
+#endif
+ };
+
+ template
+ struct _Select2nd
+#ifndef __GXX_EXPERIMENTAL_CXX0X__
+ : public unary_function<_Pair, typename _Pair::second_type>
+#endif
+ {
+ typename _Pair::second_type&
+ operator()(_Pair& __x) const
+ { return __x.second; }
+
+ const typename _Pair::second_type&
+ operator()(const _Pair& __x) const
+ { return __x.second; }
+ };
+
+ // 20.3.8 adaptors pointers members
+ /** @defgroup memory_adaptors Adaptors for pointers to members
+ * @ingroup functors
+ *
+ * There are a total of 8 = 2^3 function objects in this family.
+ * (1) Member functions taking no arguments vs member functions taking
+ * one argument.
+ * (2) Call through pointer vs call through reference.
+ * (3) Const vs non-const member function.
+ *
+ * All of this complexity is in the function objects themselves. You can
+ * ignore it by using the helper function mem_fun and mem_fun_ref,
+ * which create whichever type of adaptor is appropriate.
+ *
+ * @{
+ */
+ /// One of the @link memory_adaptors adaptors for member
+ /// pointers@endlink.
+ template
+ class mem_fun_t : public unary_function<_Tp*, _Ret>
+ {
+ public:
+ explicit
+ mem_fun_t(_Ret (_Tp::*__pf)())
+ : _M_f(__pf) { }
+
+ _Ret
+ operator()(_Tp* __p) const
+ { return (__p->*_M_f)(); }
+
+ private:
+ _Ret (_Tp::*_M_f)();
+ };
+
+ /// One of the @link memory_adaptors adaptors for member
+ /// pointers@endlink.
+ template
+ class const_mem_fun_t : public unary_function
+ {
+ public:
+ explicit
+ const_mem_fun_t(_Ret (_Tp::*__pf)() const)
+ : _M_f(__pf) { }
+
+ _Ret
+ operator()(const _Tp* __p) const
+ { return (__p->*_M_f)(); }
+
+ private:
+ _Ret (_Tp::*_M_f)() const;
+ };
+
+ /// One of the @link memory_adaptors adaptors for member
+ /// pointers@endlink.
+ template
+ class mem_fun_ref_t : public unary_function<_Tp, _Ret>
+ {
+ public:
+ explicit
+ mem_fun_ref_t(_Ret (_Tp::*__pf)())
+ : _M_f(__pf) { }
+
+ _Ret
+ operator()(_Tp& __r) const
+ { return (__r.*_M_f)(); }
+
+ private:
+ _Ret (_Tp::*_M_f)();
+ };
+
+ /// One of the @link memory_adaptors adaptors for member
+ /// pointers@endlink.
+ template
+ class const_mem_fun_ref_t : public unary_function<_Tp, _Ret>
+ {
+ public:
+ explicit
+ const_mem_fun_ref_t(_Ret (_Tp::*__pf)() const)
+ : _M_f(__pf) { }
+
+ _Ret
+ operator()(const _Tp& __r) const
+ { return (__r.*_M_f)(); }
+
+ private:
+ _Ret (_Tp::*_M_f)() const;
+ };
+
+ /// One of the @link memory_adaptors adaptors for member
+ /// pointers@endlink.
+ template
+ class mem_fun1_t : public binary_function<_Tp*, _Arg, _Ret>
+ {
+ public:
+ explicit
+ mem_fun1_t(_Ret (_Tp::*__pf)(_Arg))
+ : _M_f(__pf) { }
+
+ _Ret
+ operator()(_Tp* __p, _Arg __x) const
+ { return (__p->*_M_f)(__x); }
+
+ private:
+ _Ret (_Tp::*_M_f)(_Arg);
+ };
+
+ /// One of the @link memory_adaptors adaptors for member
+ /// pointers@endlink.
+ template
+ class const_mem_fun1_t : public binary_function
+ {
+ public:
+ explicit
+ const_mem_fun1_t(_Ret (_Tp::*__pf)(_Arg) const)
+ : _M_f(__pf) { }
+
+ _Ret
+ operator()(const _Tp* __p, _Arg __x) const
+ { return (__p->*_M_f)(__x); }
+
+ private:
+ _Ret (_Tp::*_M_f)(_Arg) const;
+ };
+
+ /// One of the @link memory_adaptors adaptors for member
+ /// pointers@endlink.
+ template
+ class mem_fun1_ref_t : public binary_function<_Tp, _Arg, _Ret>
+ {
+ public:
+ explicit
+ mem_fun1_ref_t(_Ret (_Tp::*__pf)(_Arg))
+ : _M_f(__pf) { }
+
+ _Ret
+ operator()(_Tp& __r, _Arg __x) const
+ { return (__r.*_M_f)(__x); }
+
+ private:
+ _Ret (_Tp::*_M_f)(_Arg);
+ };
+
+ /// One of the @link memory_adaptors adaptors for member
+ /// pointers@endlink.
+ template
+ class const_mem_fun1_ref_t : public binary_function<_Tp, _Arg, _Ret>
+ {
+ public:
+ explicit
+ const_mem_fun1_ref_t(_Ret (_Tp::*__pf)(_Arg) const)
+ : _M_f(__pf) { }
+
+ _Ret
+ operator()(const _Tp& __r, _Arg __x) const
+ { return (__r.*_M_f)(__x); }
+
+ private:
+ _Ret (_Tp::*_M_f)(_Arg) const;
+ };
+
+ // Mem_fun adaptor helper functions. There are only two:
+ // mem_fun and mem_fun_ref.
+ template
+ inline mem_fun_t<_Ret, _Tp>
+ mem_fun(_Ret (_Tp::*__f)())
+ { return mem_fun_t<_Ret, _Tp>(__f); }
+
+ template
+ inline const_mem_fun_t<_Ret, _Tp>
+ mem_fun(_Ret (_Tp::*__f)() const)
+ { return const_mem_fun_t<_Ret, _Tp>(__f); }
+
+ template
+ inline mem_fun_ref_t<_Ret, _Tp>
+ mem_fun_ref(_Ret (_Tp::*__f)())
+ { return mem_fun_ref_t<_Ret, _Tp>(__f); }
+
+ template
+ inline const_mem_fun_ref_t<_Ret, _Tp>
+ mem_fun_ref(_Ret (_Tp::*__f)() const)
+ { return const_mem_fun_ref_t<_Ret, _Tp>(__f); }
+
+ template
+ inline mem_fun1_t<_Ret, _Tp, _Arg>
+ mem_fun(_Ret (_Tp::*__f)(_Arg))
+ { return mem_fun1_t<_Ret, _Tp, _Arg>(__f); }
+
+ template
+ inline const_mem_fun1_t<_Ret, _Tp, _Arg>
+ mem_fun(_Ret (_Tp::*__f)(_Arg) const)
+ { return const_mem_fun1_t<_Ret, _Tp, _Arg>(__f); }
+
+ template
+ inline mem_fun1_ref_t<_Ret, _Tp, _Arg>
+ mem_fun_ref(_Ret (_Tp::*__f)(_Arg))
+ { return mem_fun1_ref_t<_Ret, _Tp, _Arg>(__f); }
+
+ template
+ inline const_mem_fun1_ref_t<_Ret, _Tp, _Arg>
+ mem_fun_ref(_Ret (_Tp::*__f)(_Arg) const)
+ { return const_mem_fun1_ref_t<_Ret, _Tp, _Arg>(__f); }
+
+ /** @} */
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace
+
+#if !defined(__GXX_EXPERIMENTAL_CXX0X__) || _GLIBCXX_USE_DEPRECATED
+# include
+#endif
+
+#endif /* _STL_FUNCTION_H */