92 lines
2.5 KiB
C++
92 lines
2.5 KiB
C++
/* This file is part of the Pangolin Project.
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* http://github.com/stevenlovegrove/Pangolin
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*
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* Copyright (c) 2014 Steven Lovegrove
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use,
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* copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following
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* conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#pragma once
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#include <pangolin/var/varvaluegeneric.h>
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#include <pangolin/compat/type_traits.h>
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#include <pangolin/utils/type_convert.h>
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namespace pangolin
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{
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template<typename T, typename S>
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class VarWrapper : public VarValueT<T>
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{
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public:
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typedef typename std::remove_reference<S>::type VarS;
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VarWrapper(VarValueT<S>& src)
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: src(src)
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{
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this->str = src.str;
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}
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const char* TypeId() const
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{
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return typeid(T).name();
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}
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void Reset()
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{
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src.Reset();
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// If reset throws, it will go up to the user, since there is nothing
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// more we can do
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cache = Convert<T,VarS>::Do(src.Get());
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}
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VarMeta& Meta()
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{
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return src.Meta();
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}
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const T& Get() const
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{
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// This might throw, but we can't reset because this is a const method
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cache = Convert<T,VarS>::Do(src.Get());
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return cache;
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}
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void Set(const T& val)
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{
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cache = val;
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try {
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src.Set( Convert<VarS, T>::Do(val) );
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}catch(const BadInputException&) {
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pango_print_warn("Unable to set variable with type %s from %s. Resetting.", typeid(VarS).name(), typeid(T).name() );
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Reset();
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}
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}
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protected:
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mutable T cache;
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VarValueT<S>& src;
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};
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}
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