NArgs.h

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#ifndef  NARGS_H
#define  NARGS_H

#include  "Expression.h"

//BOREALIS_NAMESPACE_BEGIN
using namespace Borealis;

class NArgs
{
  public:
    static const int VARARGS = -1;


    NArgs( ptr<Expression> a = ptr<Expression>(),
           ptr<Expression> b = ptr<Expression>(),
           ptr<Expression> c = ptr<Expression>() );


    NArgs( const vector<ptr<Expression> >& args );


    void requireNumArgs(int args_required) const throw (ExprException);


    void requireNumArgs(int minargs, int maxargs) const throw (ExprException);


    void requireArgType( unsigned int  index,
                             DataType  type1,
                             DataType  type2 = DataType(),
                             DataType  type3 = DataType(),
                             DataType  type4 = DataType()
                       ) const
                  throw( ExprException );


    const ptr<Expression>& arg( unsigned int idx ) const;


    unsigned int numArgs() const;


    const ptr<Expression>& operator[] (unsigned int idx) const;


    unsigned int size() const;


    bool empty() const;


  protected:
    vector<ptr<Expression> > _args;
};



class Function
{
  public:
    virtual ptr<Expression> makeExpression( const NArgs  &args )
                                     throw( ExprException ) = 0;
};

typedef Registry<Function> FunctionRegistry;
#define AURORA_DECLARE_FUNCTION(ClassName) AURORA_DECLARE_REG_CLASS(Function, ClassName)
#define AURORA_DEFINE_FUNCTION(ClassName, FuncName) \
    AURORA_DEFINE_REG_CLASS_WITH_KEY(Function, ClassName, FuncName)


//BOREALIS_NAMESPACE_END
#endif                       // NARGS_H

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