unary_function.hpp

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/******************************************************************************
 * MODULE     : unary_function.hpp
 * DESCRIPTION: unary functions
 * COPYRIGHT  : (C) 2013  Joris van der Hoeven
 *******************************************************************************
 * This software falls under the GNU general public license version 3 or later.
 * It comes WITHOUT ANY WARRANTY WHATSOEVER. For details, see the file LICENSE
 * in the root directory or <http://www.gnu.org/licenses/gpl-3.0.html>.
 ******************************************************************************/
 
#ifndef UNARY_FUNCTION_H
#define UNARY_FUNCTION_H
 
#include "basic.hpp"
 
#define TMPL template <typename T, typename S>
 
TMPL class unary_function_rep;
TMPL class unary_function;
TMPL bool is_nil (unary_function<T, S> l);
 
TMPL class unary_function_rep : public abstract_struct {
public:
  inline unary_function_rep () {}
  inline virtual ~unary_function_rep () {}
  virtual T eval (const S& arg)= 0;
};
 
TMPL class unary_function {
public:
  ABSTRACT_NULL_TEMPLATE_2 (unary_function, T, S);
  inline T operator() (const S& arg);
};
ABSTRACT_NULL_TEMPLATE_2_CODE (unary_function, typename, T, typename, S);
 
TMPL inline T
unary_function<T, S>::operator() (const S& arg) {
  return rep->eval (arg);
}
 
TMPL inline bool
operator== (unary_function<T, S> mw1, unary_function<T, S> mw2) {
  return mw1.rep == mw2.rep;
}
 
#undef TMPL
 
#endif // defined UNARY_FUNCTION_H