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https://github.com/xiaoyifang/goldendict-ng.git
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63 lines
1.9 KiB
C
63 lines
1.9 KiB
C
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/** @file
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* @brief Class for wrapping type returned by an input_iterator.
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*/
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/* Copyright (C) 2004,2008,2009,2013,2014 Olly Betts
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
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* USA
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*/
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#ifndef XAPIAN_INCLUDED_DEREFWRAPPER_H
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#define XAPIAN_INCLUDED_DEREFWRAPPER_H
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#if !defined XAPIAN_IN_XAPIAN_H && !defined XAPIAN_LIB_BUILD
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# error Never use <xapian/derefwraper.h> directly; include <xapian.h> instead.
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#endif
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namespace Xapian {
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/** @private @internal Class which returns a value when dereferenced with
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* operator*.
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*
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* We need this wrapper class to implement input_iterator semantics for the
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* postfix operator++ methods of some of our iterator classes.
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*/
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template<typename T>
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class DerefWrapper_ {
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/// Don't allow assignment.
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#if __cplusplus >= 201103L
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// Avoid warnings with newer clang.
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void operator=(const DerefWrapper_&) = delete;
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#else
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void operator=(const DerefWrapper_&);
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#endif
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/// The value.
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T res;
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public:
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#if __cplusplus >= 201103L
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/// Default copy constructor.
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DerefWrapper_(const DerefWrapper_&) = default;
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#endif
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explicit DerefWrapper_(const T &res_) : res(res_) { }
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const T & operator*() const { return res; }
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};
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}
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#endif // XAPIAN_INCLUDED_DEREFWRAPPER_H
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