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/** |
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* symbols.h: Symbol table. This is a Proof-Of-Concept and is not used anywhere yet. It may never get any use. |
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* |
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* Copyright © 2007 Pippijn van Steenhoven / The Ermyth Team |
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* Rights to this code are as documented in doc/pod/gplicense.pod. |
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* |
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* $Id: symbols.h,v 1.2 2007-09-05 11:23:13 pippijn Exp $ |
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*/ |
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|
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#ifndef ERMYTH_SYMBOL_H |
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#define ERMYTH_SYMBOL_H |
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|
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#include <boost/any.hpp> |
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|
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#include <map> |
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#include <string> |
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#include <stdexcept> |
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|
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class symbol_table |
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{ |
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typedef std::map<std::string const, boost::any> map_type; |
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map_type symbol_map; |
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|
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public: |
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template<typename T> |
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void insert (std::string const &name, T symbol) |
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{ |
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try |
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{ |
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symbol_map.at (name); |
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throw std::runtime_error ("There is already a symbol with name " + name + " in the table"); |
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} |
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catch (std::out_of_range &e) |
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{ |
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boost::any sym = symbol; |
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symbol_map[name] = sym; |
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} |
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} |
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|
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template<typename T> |
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T retrieve (std::string const &name) |
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{ |
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try |
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{ |
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boost::any sym = symbol_map.at (name); |
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return boost::any_cast<T> (sym); |
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} |
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catch (std::out_of_range &) |
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{ |
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throw std::runtime_error ("Symbol table does not contain symbol " + name); |
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} |
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catch (boost::bad_any_cast &) |
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{ |
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throw std::bad_cast (); |
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} |
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} |
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}; |
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|
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extern symbol_table symbols; |
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|
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#endif |
