131 lines
2.9 KiB
C++
131 lines
2.9 KiB
C++
//! \file attributes.hpp
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//! \brief C++ Library (header-only).
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// attributes.hpp ----------------------------------------------------------//
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//
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// Copyright Jens Luedicke 2010
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//----------------------------------------------------------------------------//
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#ifndef SETTABLE_HPP
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#define SETTABLE_HPP
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#include "string2type.hpp"
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#include <map>
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#include <string>
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#include <boost/concept/assert.hpp>
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#include <boost/concept_check.hpp>
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#include <boost/shared_ptr.hpp>
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//!
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//! \class abstract_attribute
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//! \brief Abstract base class for attributes.
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//!
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class abstract_attribute {
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public:
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//!
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//! Pure virtual method.
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//!
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//! This method needs to be implemented in classes derived from
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//! \e abstract_attribute.
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//!
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//!
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virtual void set_value(const std::string &value) = 0;
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};
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//!
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//! \class attribute
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//! \brief attribute class.
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//!
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//! Wraps a reference to an object of type T.
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//!
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//! \tparam T Assignable type.
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//!
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template<typename T>
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class attribute : public abstract_attribute {
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public:
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//!
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//! \brief Constructor
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//!
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//! \param object Reference to object of type T.
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//!
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explicit attribute(T &object)
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: reference(object) {
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BOOST_CONCEPT_ASSERT((boost::Assignable<T>));
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}
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//!
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//! \brief Implementation of set_value method.
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//!
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//! This method assigns \e value to \e this.
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//!
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//! \param value String
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//!
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virtual void set_value(const std::string &value) {
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reference = string2type::convert<T>(value);
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}
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//!
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//! \brief Implementation of get_value method.
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//!
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virtual T& get_value() const {
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return reference;
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}
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private:
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T &reference;
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};
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//!
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//! \brief Convenience macro for attribute registration.
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//!
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#define REGISTER_ATTRIBUTE(Type, Attribute) \
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this->register_attribute<Type>(#Attribute, this->Attribute);
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//!
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//! \class attributes
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//! \brief Provides attribute registration facility.
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//!
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class attributes {
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public:
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//!
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//! Sets named attribute \e attr to value \e value.
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//!
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void set_attribute(const std::string &attr, const std::string &value) {
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attributes_map::iterator it = attributes.find(attr);
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if (it != attributes.end()) {
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it->second->set_value(value);
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}
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}
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//!
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//! Registers attribute \e object with name \e name.
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//!
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template<typename T>
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void register_attribute(const std::string &name, T &object) {
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typedef attribute<T> specific_attribute;
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attribute_ptr attribute(new specific_attribute(object));
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attributes.insert(std::make_pair(name, attribute));
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}
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private:
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typedef boost::shared_ptr<abstract_attribute> attribute_ptr;
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typedef std::map<std::string, attribute_ptr> attributes_map;
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attributes_map attributes;
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};
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#endif /* SETTABLE_HPP */
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