/*

  *

  * 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: