subroutineFrame.hpp

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#ifndef _DATABASE_VIRTUAL_MACHINE_SUBROUTINE_FRAME_HPP_INCLUDED
#define _DATABASE_VIRTUAL_MACHINE_SUBROUTINE_FRAME_HPP_INCLUDED
#include "database/vm/valueTupleSet.hpp"
#include "types/variant.hpp"
#include <string>
#include <vector>
#include <cstdlib>
#include <boost/shared_ptr.hpp>

namespace _Wolframe {
namespace db {
namespace vm {

class SubroutineFrame
{
public:
        SubroutineFrame(){}
        explicit SubroutineFrame( const std::vector<std::string>& paramnames_)
                :m_paramnames(paramnames_){}
        SubroutineFrame( const SubroutineFrame& o)
                :m_paramnames(o.m_paramnames)
                ,m_paramvalues(o.m_paramvalues){}

        void clear()
        {
                m_paramnames.clear();
                m_paramvalues.clear();
        }

        void init( const std::vector<std::string>& paramnames_)
        {
                clear();
                m_paramnames = paramnames_;
        }

        void push( const types::Variant& p)
        {
                if (m_paramvalues.size() >= m_paramnames.size())
                {
                        throw std::runtime_error("too many parameters passed to subroutine");
                }
                m_paramvalues.push_back( p);
        }
        ValueTupleSetR getParameters() const
        {
                if (m_paramvalues.size() < m_paramnames.size())
                {
                        throw std::runtime_error("too few parameters passed to subroutine");
                }
                ValueTupleSetR rt( new ValueTupleSet( m_paramnames));
                rt->push( m_paramvalues);
                return rt;
        }

private:
        std::vector<std::string> m_paramnames;          
        std::vector<types::Variant> m_paramvalues;      
};

}}}//namespace
#endif