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// file : CCF/CompilerElements/Context.hpp
// author : Boris Kolpackov <boris@dre.vanderbilt.edu>
// cvs-id : $Id$
#ifndef CCF_COMPILER_ELEMENTS_CONTEXT_HPP
#define CCF_COMPILER_ELEMENTS_CONTEXT_HPP
#include <map>
#include <string>
#include <Utility/Hetero/Container.hpp>
namespace CCF
{
namespace CompilerElements
{
class Context
{
typedef
std::map<std::string, Utility::Hetero::Container>
Map;
public:
Context ()
{
}
public:
class NotFound {};
class Typing {};
Map::size_type
count (char const* key) const throw ()
{
return map_.count (key);
}
template <typename T>
T const&
get (char const* key) const throw (NotFound, Typing)
{
Map::const_iterator i = map_.find (key);
if (i == map_.end ()) throw NotFound ();
try
{
return i->second. template value<T> ();
}
catch (Utility::Hetero::Typing const&)
{
throw Typing ();
}
}
template <typename T>
T const&
get (char const* key, T const& def) const throw (Typing)
{
Map::const_iterator i = map_.find (key);
if (i == map_.end ()) return def;
try
{
return i->second. template value<T> ();
}
catch (Utility::Hetero::Typing const&)
{
throw Typing ();
}
}
template <typename T>
void
set (char const* key, T const& value) throw (Typing)
{
try
{
if (!map_.insert (std::pair<std::string,
Utility::Hetero::Container>(key, value)).second)
{
Map::iterator i = map_.find (key);
i->second.template value <T> () = value;
}
}
catch (Utility::Hetero::Typing const&)
{
throw Typing ();
}
}
void
remove (char const* key) throw (NotFound)
{
Map::iterator i (map_.find (key));
if (i == map_.end ()) throw NotFound ();
map_.erase (i);
}
private:
Map map_;
private:
// Copy semanic is not supported.
Context (Context const&) throw ();
Context& operator= (Context const&) throw ();
};
}
}
#endif // CCF_COMPILER_ELEMENTS_CONTEXT_HPP
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