117 lines
5.5 KiB
C++
117 lines
5.5 KiB
C++
/***************************************************************************
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* Copyright (c) 2019 Abdullah Tahiri <abdullah.tahiri.yo@gmail.com> *
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* *
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* This file is part of the FreeCAD CAx development system. *
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* *
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* This library is free software; you can redistribute it and/or *
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* modify it under the terms of the GNU Library General Public *
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* License as published by the Free Software Foundation; either *
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* version 2 of the License, or (at your option) any later version. *
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* *
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* This library 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 Library General Public License for more details. *
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* *
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* You should have received a copy of the GNU Library General Public *
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* License along with this library; see the file COPYING.LIB. If not, *
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* write to the Free Software Foundation, Inc., 59 Temple Place, *
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* Suite 330, Boston, MA 02111-1307, USA *
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* *
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***************************************************************************/
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#ifndef PART_GEOMETRYDEFAULTEXTENSION_H
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#define PART_GEOMETRYDEFAULTEXTENSION_H
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#include <string>
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#include "GeometryExtension.h"
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namespace Part {
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template <typename T>
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class PartExport GeometryDefaultExtension: public Part::GeometryPersistenceExtension
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{
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TYPESYSTEM_HEADER_WITH_OVERRIDE();
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public:
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inline GeometryDefaultExtension();
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GeometryDefaultExtension(const T& val, std::string name = std::string());
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~GeometryDefaultExtension() override = default;
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inline void setValue(const T& val) {value = val;};
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inline const T &getValue() const {return value;};
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std::unique_ptr<Part::GeometryExtension> copy() const override;
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PyObject *getPyObject() override;
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protected:
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void copyAttributes(Part::GeometryExtension * cpy) const override;
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void restoreAttributes(Base::XMLReader &reader) override;
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void saveAttributes(Base::Writer &writer) const override;
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private:
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GeometryDefaultExtension(const GeometryDefaultExtension<T>&) = default;
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private:
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T value;
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};
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// Description:
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//
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// This template allows to define a geometry extension for a given type (uniform interface for one value of type T).
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//
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// Warnings:
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// - The default constructor relies on the default constructor of T for initialisation. Built-in types
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// so constructed will be uninitialised. Use the specific constructor from a T to initialise it. Note
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// that the default constructor is required by the type system (see TYPESYSTEM_SOURCE_TEMPLATE_T).
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//
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// Default assumptions:
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// - T can be constructed from T
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// - T can be assigned to T
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// - T is convertible to a std::string
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// - T is serialisable as a string
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//
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// template specialisation:
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//
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// If the assumptions do not meet for your type, template specialisation allows you to provide specific code,
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// look for examples (int/string) in GeometryDefaultExtensions.cpp
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//
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// Instructions:
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//
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// 1. Read the assumptions above and provide template initialisation if needed.
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// 2. Add an alias to your type under these comments
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// 3. Add a TYPESYSTEM_SOURCE_TEMPLATE_T in the cpp file to generate class type information
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// 4. Provide a specialisation of getPyObject to generate a py object of the corresponding type (cpp file)
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// 5. Provide specialisations if your type does not meet the assumptions above (e.g. for serialisation) (cpp file)
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// 6. Register your type and corresponding python type in AppPart.cpp
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template <typename T>
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Base::Type GeometryDefaultExtension<T>::classTypeId{Base::Type::badType()};
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// Must be explicitly declared here
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template<> void * GeometryDefaultExtension<long>::create();
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template<> void * GeometryDefaultExtension<std::string>::create();
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template<> void * GeometryDefaultExtension<bool>::create();
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template<> void * GeometryDefaultExtension<double>::create();
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template <typename T>
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inline GeometryDefaultExtension<T>::GeometryDefaultExtension():value{}{}
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// Specialised constructors go here so that specialisation is before the template instantiation
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// Specialised default constructors are inline, because a full specialisation otherwise shall go in the cpp file, but there it would be after the template instantiation.
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template <>
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inline GeometryDefaultExtension<long>::GeometryDefaultExtension():value(0){}
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template <>
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inline GeometryDefaultExtension<double>::GeometryDefaultExtension():value(0.0f){}
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// Prefer alias to typedef item 9
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using GeometryIntExtension = GeometryDefaultExtension<long>;
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using GeometryStringExtension = GeometryDefaultExtension<std::string>;
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using GeometryBoolExtension = GeometryDefaultExtension<bool>;
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using GeometryDoubleExtension = GeometryDefaultExtension<double>;
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}
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#endif // PART_GEOMETRYDEFAULTEXTENSION_H
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