132 lines
3.3 KiB
C++
132 lines
3.3 KiB
C++
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/*
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TREE-DIFF-TRAITS.hpp - definitions to control tree mutator binding
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Copyright (C) Lumiera.org
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2016, 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 tree-diff-traits.hpp
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** Definitions and Properties to guide automated tree mutator binding.
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** Decision how to access the target structure and how to construct
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** a suitable TreeMutator as attached to this opaque target data.
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**
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** @todo this is WIP as of 8/2016
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**
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** @see DiffVirtualisedApplication_test
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** @see DiffTreeApplication_test
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** @see DiffListApplication_test
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** @see GenNodeBasic_test
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** @see tree-diff.hpp
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**
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*/
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#ifndef LIB_DIFF_TREE_DIFF_TRAITS_H
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#define LIB_DIFF_TREE_DIFF_TRAITS_H
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#include "lib/diff/tree-mutator.hpp"
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#include "lib/diff/diff-mutable.hpp"
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#include "lib/util.hpp"
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#include <utility>
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#include <stack>
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namespace lib {
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namespace diff{
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/* ======= derive a TreeMutator binding for a given opaque data structure ======= */
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using meta::enable_if;
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using meta::Yes_t;
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using meta::No_t;
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using std::is_same;
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/**
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* helper to detect presence of a
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* TreeMutator builder function
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*/
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template<typename T>
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class exposes_MutatorBuilder
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{
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META_DETECT_FUNCTION (void, buildMutator, (TreeMutator::Handle));
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public:
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enum{ value = HasFunSig_buildMutator<T>::value
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};
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};
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template<class TAR, typename SEL =void>
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struct TreeDiffTraits
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{
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static_assert (!sizeof(TAR), "TreeDiffTraits: Unable to access or build a TreeMutator for this target data.");
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};
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template<class TAR>
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struct TreeDiffTraits<TAR, enable_if<is_same<TAR, DiffMutable>>>
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{
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using Ret = DiffMutable&;
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};
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template<class TAR>
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struct TreeDiffTraits<TAR, enable_if<exposes_MutatorBuilder<TAR>>>
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{
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class Wrapper
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: public DiffMutable
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{
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TAR& subject_;
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/** implement the TreeMutator interface,
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* by forwarding to a known implementation function
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* on the wrapped target data type */
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virtual void
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buildMutator (TreeMutator::Handle handle)
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{
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subject_.buildMutator (handle);
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}
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public:
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Wrapper(TAR& subj)
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: subject_(subj)
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{ }
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};
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using Ret = Wrapper;
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};
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template<class TAR>
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auto
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mutatorBinding (TAR& subject) -> typename TreeDiffTraits<TAR>::Ret
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{
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using Wrapper = typename TreeDiffTraits<TAR>::Ret;
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return Wrapper{subject};
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}
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}} // namespace lib::diff
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#endif /*LIB_DIFF_TREE_DIFF_TRAITS_H*/
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