79 lines
2.4 KiB
C++
79 lines
2.4 KiB
C++
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/*
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RECORD-CONTENT-MUTATOR.hpp - helper to remould record contents
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Copyright (C) Lumiera.org
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2015, Hermann Vosseler <Ichthyostega@web.de>
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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
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the License, or (at your option) any later version.
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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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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., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/** @file record-content-mutator.hpp
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** Implementation helper for reshaping the contents of a lib::diff::Record.
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** This technical helper is necessary to apply one level of a "Tree Diff"
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** to an object represented as #Record::Mutator. Since records as such are
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** designed as immutable value objects, we build a dedicated #Record::Mutator
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** when it comes to reordering the contents of a given record. The technical
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** details of doing so are highly coupled to the actual storage implementation
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** of #Record, as well as to the actual procedure to apply a diff message, as
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** implemented in lib::diff::DiffApplicationStrategy.
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**
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** @see generic-record-update-test.cpp
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** @see tree-diff-application-test.cpp
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** @see Record::Mutator
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** @see diff-language.hpp
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**
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*/
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#ifndef LIB_DIFF_RECORD_CONTENT_MUTATOR_H
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#define LIB_DIFF_RECORD_CONTENT_MUTATOR_H
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#include "lib/error.hpp"
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#include <boost/noncopyable.hpp>
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#include <utility>
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namespace lib {
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namespace diff{
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using std::move;
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using std::swap;
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/** @internal helper for DiffApplicationStrategy<Rec::Mutator> */
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template<class STO>
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class RecordContentMutator
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: boost::noncopyable
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{
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public:
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explicit
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RecordContentMutator()
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{
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swap (attribs_, target_.attribs());
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swap (children_, target_.children());
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// heuristics for storage pre-allocation
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target_.attribs().reserve (attribs_.size() * 120 / 100);
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target_.children().reserve (children_.size() * 120 / 100);
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}
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};
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}} // namespace lib::diff
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#endif /*LIB_DIFF_RECORD_CONTENT_MUTATOR_H*/
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