--- /dev/null
+// Functor implementations -*- C++ -*-
+
+// Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2009
+// 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
+// <http://www.gnu.org/licenses/>.
+
+/*
+ *
+ * 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 backward/binders.h
+ * This is an internal header file, included by other library headers.
+ * You should not attempt to use it directly.
+ */
+
+#ifndef _GLIBCXX_BINDERS_H
+#define _GLIBCXX_BINDERS_H 1
+
+_GLIBCXX_BEGIN_NAMESPACE(std)
+
+ // 20.3.6 binders
+ /** @defgroup binders Binder Classes
+ * @ingroup functors
+ *
+ * Binders turn functions/functors with two arguments into functors with
+ * a single argument, storing an argument to be applied later. For
+ * example, a variable @c B of type @c binder1st is constructed from a
+ * functor @c f and an argument @c x. Later, B's @c operator() is called
+ * with a single argument @c y. The return value is the value of @c f(x,y).
+ * @c B can be "called" with various arguments (y1, y2, ...) and will in
+ * turn call @c f(x,y1), @c f(x,y2), ...
+ *
+ * The function @c bind1st is provided to save some typing. It takes the
+ * function and an argument as parameters, and returns an instance of
+ * @c binder1st.
+ *
+ * The type @c binder2nd and its creator function @c bind2nd do the same
+ * thing, but the stored argument is passed as the second parameter instead
+ * of the first, e.g., @c bind2nd(std::minus<float>,1.3) will create a
+ * functor whose @c operator() accepts a floating-point number, subtracts
+ * 1.3 from it, and returns the result. (If @c bind1st had been used,
+ * the functor would perform "1.3 - x" instead.
+ *
+ * Creator-wrapper functions like @c bind1st are intended to be used in
+ * calling algorithms. Their return values will be temporary objects.
+ * (The goal is to not require you to type names like
+ * @c std::binder1st<std::plus<int>> for declaring a variable to hold the
+ * return value from @c bind1st(std::plus<int>,5).
+ *
+ * These become more useful when combined with the composition functions.
+ *
+ * @{
+ */
+ /// One of the @link binders binder functors@endlink.
+ template<typename _Operation>
+ class binder1st
+ : public unary_function<typename _Operation::second_argument_type,
+ typename _Operation::result_type>
+ {
+ protected:
+ _Operation op;
+ typename _Operation::first_argument_type value;
+
+ public:
+ binder1st(const _Operation& __x,
+ const typename _Operation::first_argument_type& __y)
+ : op(__x), value(__y) { }
+
+ typename _Operation::result_type
+ operator()(const typename _Operation::second_argument_type& __x) const
+ { return op(value, __x); }
+
+ // _GLIBCXX_RESOLVE_LIB_DEFECTS
+ // 109. Missing binders for non-const sequence elements
+ typename _Operation::result_type
+ operator()(typename _Operation::second_argument_type& __x) const
+ { return op(value, __x); }
+ } _GLIBCXX_DEPRECATED_ATTR;
+
+ /// One of the @link binders binder functors@endlink.
+ template<typename _Operation, typename _Tp>
+ inline binder1st<_Operation>
+ bind1st(const _Operation& __fn, const _Tp& __x)
+ {
+ typedef typename _Operation::first_argument_type _Arg1_type;
+ return binder1st<_Operation>(__fn, _Arg1_type(__x));
+ }
+
+ /// One of the @link binders binder functors@endlink.
+ template<typename _Operation>
+ class binder2nd
+ : public unary_function<typename _Operation::first_argument_type,
+ typename _Operation::result_type>
+ {
+ protected:
+ _Operation op;
+ typename _Operation::second_argument_type value;
+
+ public:
+ binder2nd(const _Operation& __x,
+ const typename _Operation::second_argument_type& __y)
+ : op(__x), value(__y) { }
+
+ typename _Operation::result_type
+ operator()(const typename _Operation::first_argument_type& __x) const
+ { return op(__x, value); }
+
+ // _GLIBCXX_RESOLVE_LIB_DEFECTS
+ // 109. Missing binders for non-const sequence elements
+ typename _Operation::result_type
+ operator()(typename _Operation::first_argument_type& __x) const
+ { return op(__x, value); }
+ } _GLIBCXX_DEPRECATED_ATTR;
+
+ /// One of the @link binders binder functors@endlink.
+ template<typename _Operation, typename _Tp>
+ inline binder2nd<_Operation>
+ bind2nd(const _Operation& __fn, const _Tp& __x)
+ {
+ typedef typename _Operation::second_argument_type _Arg2_type;
+ return binder2nd<_Operation>(__fn, _Arg2_type(__x));
+ }
+ /** @} */
+
+_GLIBCXX_END_NAMESPACE
+
+#endif /* _GLIBCXX_BINDERS_H */
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