/*

 *

 * Copyright (c) 1994

 * Hewlett-Packard Company

 *

 * Copyright (c) 1996-1998

 * Silicon Graphics Computer Systems, Inc.

 *

 * Copyright (c) 1997

 * Moscow Center for SPARC Technology

 *

 * Copyright (c) 1999 

 * Boris Fomitchev

 *

 * This material is provided "as is", with absolutely no warranty expressed

 * or implied. Any use is at your own risk.

 *

 * Permission to use or copy this software for any purpose is hereby granted 

 * without fee, provided the above notices are retained on all copies.

 * Permission to modify the code and to distribute modified code is granted,

 * provided the above notices are retained, and a notice that the code was

 * modified is included with the above copyright notice.

 *

 */

/* NOTE: This is an internal header file, included by other STL headers.

 *   You should not attempt to use it directly.

 */

#ifndef _STLP_INTERNAL_FUNCTION_H

#define _STLP_INTERNAL_FUNCTION_H

#ifndef _STLP_INTERNAL_FUNCTION_BASE_H

#include <stl/_function_base.h>

#endif

_STLP_BEGIN_NAMESPACE

# ifndef _STLP_NO_EXTENSIONS

// identity_element (not part of the C++ standard).

template <class _Tp> inline _Tp identity_element(plus<_Tp>) {  return _Tp(0); }

template <class _Tp> inline _Tp identity_element(multiplies<_Tp>) { return _Tp(1); }

# endif

#  if defined (_STLP_BASE_TYPEDEF_BUG)

// this workaround is needed for SunPro 4.0.1

// suggested by "Martin Abernethy" <gma@paston.co.uk>:

// We have to introduce the XXary_predicate_aux structures in order to

// access the argument and return types of predicate functions supplied

// as type parameters. SUN C++ 4.0.1 compiler gives errors for template type parameters

// of the form 'name1::name2', where name1 is itself a type parameter.

template <class _Pair>

struct __pair_aux : private _Pair

{

	typedef typename _Pair::first_type first_type;

	typedef typename _Pair::second_type second_type;

};

template <class _Operation>

struct __unary_fun_aux : private _Operation

{

	typedef typename _Operation::argument_type argument_type;

	typedef typename _Operation::result_type result_type;

};

template <class _Operation>

struct __binary_fun_aux  : private _Operation

{

	typedef typename _Operation::first_argument_type first_argument_type;

	typedef typename _Operation::second_argument_type second_argument_type;

	typedef typename _Operation::result_type result_type;

};

#  define __UNARY_ARG(__Operation,__type)  __unary_fun_aux<__Operation>::__type

#  define __BINARY_ARG(__Operation,__type)  __binary_fun_aux<__Operation>::__type

#  define __PAIR_ARG(__Pair,__type)  __pair_aux<__Pair>::__type

# else

#  define __UNARY_ARG(__Operation,__type)  __Operation::__type

#  define __BINARY_ARG(__Operation,__type) __Operation::__type

#  define __PAIR_ARG(__Pair,__type) __Pair::__type

# endif

template <class _Predicate>

class unary_negate : 

    public unary_function<typename __UNARY_ARG(_Predicate,argument_type), bool> {

protected:

  _Predicate _M_pred;

public:

  explicit unary_negate(const _Predicate& __x) : _M_pred(__x) {}

  bool operator()(const typename _Predicate::argument_type& __x) const {

    return !_M_pred(__x);

  }

};

template <class _Predicate>

inline unary_negate<_Predicate> 

not1(const _Predicate& __pred)

{

  return unary_negate<_Predicate>(__pred);

}

template <class _Predicate> 

class binary_negate 

    : public binary_function<typename __BINARY_ARG(_Predicate,first_argument_type),

			     typename __BINARY_ARG(_Predicate,second_argument_type), 

                             bool> {

protected:

  _Predicate _M_pred;

public:

  explicit binary_negate(const _Predicate& __x) : _M_pred(__x) {}

  bool operator()(const typename _Predicate::first_argument_type& __x, 

                  const typename _Predicate::second_argument_type& __y) const

  {

    return !_M_pred(__x, __y); 

  }

};

template <class _Predicate>

inline binary_negate<_Predicate> 

not2(const _Predicate& __pred)

{

  return binary_negate<_Predicate>(__pred);

}

template <class _Operation> 

class binder1st : 

    public unary_function<typename __BINARY_ARG(_Operation,second_argument_type),

                          typename __BINARY_ARG(_Operation,result_type) > {

protected:

  _Operation op;

  typename _Operation::first_argument_type value;

public:

  binder1st(const _Operation& __x,

            const typename _Operation::first_argument_type& __y)

      : op(__x), value(__y) {}

  typename _Operation::result_type

  operator()(const typename _Operation::second_argument_type& __x) const {

    return op(value, __x); 

  }

  typename _Operation::result_type

  operator()(typename _Operation::second_argument_type& __x) const {

    return op(value, __x); 

  }

};

template <class _Operation, class _Tp>

inline binder1st<_Operation> 

bind1st(const _Operation& __fn, const _Tp& __x) 

{

  typedef typename _Operation::first_argument_type _Arg1_type;

  return binder1st<_Operation>(__fn, _Arg1_type(__x));

}

template <class _Operation> 

class binder2nd

  : public unary_function<typename __BINARY_ARG(_Operation,first_argument_type),

                          typename __BINARY_ARG(_Operation,result_type)> {

protected:

  _Operation op;

  typename _Operation::second_argument_type value;

public:

  binder2nd(const _Operation& __x,

            const typename _Operation::second_argument_type& __y) 

      : op(__x), value(__y) {}

  typename _Operation::result_type

  operator()(const typename _Operation::first_argument_type& __x) const {

    return op(__x, value); 

  }

  typename _Operation::result_type

  operator()(typename _Operation::first_argument_type& __x) const {

    return op(__x, value); 

  }

};

template <class _Operation, class _Tp>

inline binder2nd<_Operation> 

bind2nd(const _Operation& __fn, const _Tp& __x) 

{

  typedef typename _Operation::second_argument_type _Arg2_type;

  return binder2nd<_Operation>(__fn, _Arg2_type(__x));

}

# ifndef _STLP_NO_EXTENSIONS

// unary_compose and binary_compose (extensions, not part of the standard).

template <class _Operation1, class _Operation2>

class unary_compose : 

  public unary_function<typename __UNARY_ARG(_Operation2,argument_type),

                        typename __UNARY_ARG(_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));

  }

  typename _Operation1::result_type

  operator()(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 unary_function<typename __UNARY_ARG(_Operation2,argument_type),

                          typename __BINARY_ARG(_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));

  }

  typename _Operation1::result_type

  operator()(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);

}

# endif /* _STLP_NO_EXTENSIONS */

# ifndef _STLP_NO_EXTENSIONS

// identity is an extension: it is not part of the standard.

template <class _Tp> struct identity : public _Identity<_Tp> {};

// select1st and select2nd are extensions: they are not part of the standard.

template <class _Pair> struct select1st : public _Select1st<_Pair> {};

template <class _Pair> struct select2nd : public _Select2nd<_Pair> {};

template <class _Arg1, class _Arg2> 

struct project1st : public _Project1st<_Arg1, _Arg2> {};

template <class _Arg1, class _Arg2>

struct project2nd : public _Project2nd<_Arg1, _Arg2> {};

// constant_void_fun, constant_unary_fun, and constant_binary_fun are

// extensions: they are not part of the standard.  (The same, of course,

// is true of the helper functions constant0, constant1, and constant2.)

template <class _Result>

struct _Constant_void_fun {

  typedef _Result result_type;

  result_type _M_val;

  _Constant_void_fun(const result_type& __v) : _M_val(__v) {}

  const result_type& operator()() const { return _M_val; }

};  

template <class _Result>

struct constant_void_fun : public _Constant_void_fun<_Result> {

  constant_void_fun(const _Result& __v) : _Constant_void_fun<_Result>(__v) {}

};  

template <class _Result, __DFL_TMPL_PARAM( _Argument , _Result) >

struct constant_unary_fun : public _Constant_unary_fun<_Result, _Argument>

{

  constant_unary_fun(const _Result& __v)

    : _Constant_unary_fun<_Result, _Argument>(__v) {}

};

template <class _Result, __DFL_TMPL_PARAM( _Arg1 , _Result), __DFL_TMPL_PARAM( _Arg2 , _Arg1) >

struct constant_binary_fun

  : public _Constant_binary_fun<_Result, _Arg1, _Arg2>

{

  constant_binary_fun(const _Result& __v)

    : _Constant_binary_fun<_Result, _Arg1, _Arg2>(__v) {}

};

template <class _Result>

inline constant_void_fun<_Result> constant0(const _Result& __val)

{

  return constant_void_fun<_Result>(__val);

}

template <class _Result>

inline constant_unary_fun<_Result,_Result> constant1(const _Result& __val)

{

  return constant_unary_fun<_Result,_Result>(__val);

}

template <class _Result>

inline constant_binary_fun<_Result,_Result,_Result> 

constant2(const _Result& __val)

{

  return constant_binary_fun<_Result,_Result,_Result>(__val);

}

// subtractive_rng is an extension: it is not part of the standard.

// Note: this code assumes that int is 32 bits.

class subtractive_rng : public unary_function<_STLP_UINT32_T, _STLP_UINT32_T> {

private:

  _STLP_UINT32_T _M_table[55];

  _STLP_UINT32_T _M_index1;

  _STLP_UINT32_T _M_index2;

public:

  _STLP_UINT32_T operator()(_STLP_UINT32_T __limit) {

    _M_index1 = (_M_index1 + 1) % 55;

    _M_index2 = (_M_index2 + 1) % 55;

    _M_table[_M_index1] = _M_table[_M_index1] - _M_table[_M_index2];

    return _M_table[_M_index1] % __limit;

  }

  void _M_initialize(_STLP_UINT32_T __seed)

  {

    _STLP_UINT32_T __k = 1;

    _M_table[54] = __seed;

    _STLP_UINT32_T __i;

    for (__i = 0; __i < 54; __i++) {

        _STLP_UINT32_T __ii = (21 * (__i + 1) % 55) - 1;

        _M_table[__ii] = __k;

        __k = __seed - __k;

        __seed = _M_table[__ii];

    }

    for (int __loop = 0; __loop < 4; __loop++) {

        for (__i = 0; __i < 55; __i++)

            _M_table[__i] = _M_table[__i] - _M_table[(1 + __i + 30) % 55];

    }

    _M_index1 = 0;

    _M_index2 = 31;

  }

  subtractive_rng(unsigned int __seed) { _M_initialize(__seed); }

  subtractive_rng() { _M_initialize(161803398ul); }

};

# endif /* _STLP_NO_EXTENSIONS */

_STLP_END_NAMESPACE

#include <stl/_function_adaptors.h>

#endif /* _STLP_INTERNAL_FUNCTION_H */

// Local Variables:

// mode:C++

// End: