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#ifndef _RHEOLEF_FUNCTIONAL_SGI_EXT_H
#define _RHEOLEF_FUNCTIONAL_SGI_EXT_H
///
/// This file is part of Rheolef.
///
/// Copyright (C) 2000-2009 Pierre Saramito <Pierre.Saramito@imag.fr>
///
/// Rheolef is free software; you can redistribute it and/or modify
/// it under the terms of the GNU General Public License as published by
/// the Free Software Foundation; either version 2 of the License, or
/// (at your option) any later version.
///
/// Rheolef is distributed in the hope that it will be useful,
/// but WITHOUT ANY WARRANTY; without even the implied warranty of
/// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
/// GNU General Public License for more details.
///
/// You should have received a copy of the GNU General Public License
/// along with Rheolef; if not, write to the Free Software
/// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
/// 
/// =========================================================================
namespace rheolef {
  template <class _Operation1, class _Operation2>
    class unary_compose
    : public std::unary_function<typename _Operation2::argument_type,
			    typename _Operation1::result_type>
    {
    protected:
      _Operation1 _M_fn1;
      _Operation2 _M_fn2;

    public:
      unary_compose(const _Operation1& __x, const _Operation2& __y)
      : _M_fn1(__x), _M_fn2(__y) {}

      typename _Operation1::result_type
      operator()(const typename _Operation2::argument_type& __x) const
      { return _M_fn1(_M_fn2(__x)); }
    };

  template <class _Operation1, class _Operation2>
    inline unary_compose<_Operation1, _Operation2>
    compose1(const _Operation1& __fn1, const _Operation2& __fn2)
    { return unary_compose<_Operation1,_Operation2>(__fn1, __fn2); }

  template <class _Operation1, class _Operation2, class _Operation3>
    class binary_compose
    : public std::unary_function<typename _Operation2::argument_type,
			    typename _Operation1::result_type>
    {
    protected:
      _Operation1 _M_fn1;
      _Operation2 _M_fn2;
      _Operation3 _M_fn3;
      
    public:
      binary_compose(const _Operation1& __x, const _Operation2& __y,
		     const _Operation3& __z)
      : _M_fn1(__x), _M_fn2(__y), _M_fn3(__z) { }

      typename _Operation1::result_type
      operator()(const typename _Operation2::argument_type& __x) const
      { return _M_fn1(_M_fn2(__x), _M_fn3(__x)); }
    };

  template <class _Operation1, class _Operation2, class _Operation3>
    inline binary_compose<_Operation1, _Operation2, _Operation3>
    compose2(const _Operation1& __fn1, const _Operation2& __fn2,
	     const _Operation3& __fn3)
    { return binary_compose<_Operation1, _Operation2, _Operation3>
	(__fn1, __fn2, __fn3); }

} // namespace rheolef
#endif // _RHEOLEF_FUNCTIONAL_SGI_EXT_H