stl_algobase.h

linux下编程用 编译软件

    inline _OI
    __copy_aux(_II __first, _II __last, _OI __result)
    {
      typedef typename iterator_traits<_II>::value_type _ValueTypeI;
      typedef typename iterator_traits<_OI>::value_type _ValueTypeO;
      typedef typename iterator_traits<_II>::iterator_category _Category;
      const bool __simple = (__is_scalar<_ValueTypeI>::__value
	                     && __is_pointer<_II>::__value
	                     && __is_pointer<_OI>::__value
			     && __are_same<_ValueTypeI, _ValueTypeO>::__value);

      return std::__copy<__simple, _Category>::copy(__first, __last, __result);
    }

  template<bool, bool>
    struct __copy_normal
    {
      template<typename _II, typename _OI>
        static _OI
        copy_n(_II __first, _II __last, _OI __result)
        { return std::__copy_aux(__first, __last, __result); }
    };

  template<>
    struct __copy_normal<true, false>
    {
      template<typename _II, typename _OI>
        static _OI
        copy_n(_II __first, _II __last, _OI __result)
        { return std::__copy_aux(__first.base(), __last.base(), __result); }
    };

  template<>
    struct __copy_normal<false, true>
    {
      template<typename _II, typename _OI>
        static _OI
        copy_n(_II __first, _II __last, _OI __result)
        { return _OI(std::__copy_aux(__first, __last, __result.base())); }
    };

  template<>
    struct __copy_normal<true, true>
    {
      template<typename _II, typename _OI>
        static _OI
        copy_n(_II __first, _II __last, _OI __result)
        { return _OI(std::__copy_aux(__first.base(), __last.base(),
				     __result.base())); }
    };

  /**
   *  @brief Copies the range [first,last) into result.
   *  @param  first  An input iterator.
   *  @param  last   An input iterator.
   *  @param  result An output iterator.
   *  @return   result + (first - last)
   *
   *  This inline function will boil down to a call to @c memmove whenever
   *  possible.  Failing that, if random access iterators are passed, then the
   *  loop count will be known (and therefore a candidate for compiler
   *  optimizations such as unrolling).  Result may not be contained within
   *  [first,last); the copy_backward function should be used instead.
   *
   *  Note that the end of the output range is permitted to be contained
   *  within [first,last).
  */
  template<typename _InputIterator, typename _OutputIterator>
    inline _OutputIterator
    copy(_InputIterator __first, _InputIterator __last,
	 _OutputIterator __result)
    {
      // concept requirements
      __glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
      __glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
	    typename iterator_traits<_InputIterator>::value_type>)
      __glibcxx_requires_valid_range(__first, __last);

       const bool __in = __is_normal_iterator<_InputIterator>::__value;
       const bool __out = __is_normal_iterator<_OutputIterator>::__value;
       return std::__copy_normal<__in, __out>::copy_n(__first, __last,
						      __result);
    }
  
  template<bool, typename>
    struct __copy_backward
    {
      template<typename _BI1, typename _BI2>
        static _BI2
        copy_b(_BI1 __first, _BI1 __last, _BI2 __result)
        { 
	  while (__first != __last)
	    *--__result = *--__last;
	  return __result;
	}
    };

  template<bool _BoolType>
    struct __copy_backward<_BoolType, random_access_iterator_tag>
    {
      template<typename _BI1, typename _BI2>
        static _BI2
        copy_b(_BI1 __first, _BI1 __last, _BI2 __result)
        { 
	  typename iterator_traits<_BI1>::difference_type __n;
	  for (__n = __last - __first; __n > 0; --__n)
	    *--__result = *--__last;
	  return __result;
	}
    };

  template<>
    struct __copy_backward<true, random_access_iterator_tag>
    {
      template<typename _Tp>
        static _Tp*
        copy_b(const _Tp* __first, const _Tp* __last, _Tp* __result)
        { 
	  const ptrdiff_t _Num = __last - __first;
	  std::memmove(__result - _Num, __first, sizeof(_Tp) * _Num);
	  return __result - _Num;
	}
    };

  template<typename _BI1, typename _BI2>
    inline _BI2
    __copy_backward_aux(_BI1 __first, _BI1 __last, _BI2 __result)
    {
      typedef typename iterator_traits<_BI1>::value_type _ValueType1;
      typedef typename iterator_traits<_BI2>::value_type _ValueType2;
      typedef typename iterator_traits<_BI1>::iterator_category _Category;
      const bool __simple = (__is_scalar<_ValueType1>::__value
	                     && __is_pointer<_BI1>::__value
	                     && __is_pointer<_BI2>::__value
			     && __are_same<_ValueType1, _ValueType2>::__value);

      return std::__copy_backward<__simple, _Category>::copy_b(__first, __last,
							       __result);
    }

  template<bool, bool>
    struct __copy_backward_normal
    {
      template<typename _BI1, typename _BI2>
        static _BI2
        copy_b_n(_BI1 __first, _BI1 __last, _BI2 __result)
        { return std::__copy_backward_aux(__first, __last, __result); }
    };

  template<>
    struct __copy_backward_normal<true, false>
    {
      template<typename _BI1, typename _BI2>
        static _BI2
        copy_b_n(_BI1 __first, _BI1 __last, _BI2 __result)
        { return std::__copy_backward_aux(__first.base(), __last.base(),
					  __result); }
    };

  template<>
    struct __copy_backward_normal<false, true>
    {
      template<typename _BI1, typename _BI2>
        static _BI2
        copy_b_n(_BI1 __first, _BI1 __last, _BI2 __result)
        { return _BI2(std::__copy_backward_aux(__first, __last,
					       __result.base())); }
    };

  template<>
    struct __copy_backward_normal<true, true>
    {
      template<typename _BI1, typename _BI2>
        static _BI2
        copy_b_n(_BI1 __first, _BI1 __last, _BI2 __result)
        { return _BI2(std::__copy_backward_aux(__first.base(), __last.base(),
					       __result.base())); }
    };

  /**
   *  @brief Copies the range [first,last) into result.
   *  @param  first  A bidirectional iterator.
   *  @param  last   A bidirectional iterator.
   *  @param  result A bidirectional iterator.
   *  @return   result - (first - last)
   *
   *  The function has the same effect as copy, but starts at the end of the
   *  range and works its way to the start, returning the start of the result.
   *  This inline function will boil down to a call to @c memmove whenever
   *  possible.  Failing that, if random access iterators are passed, then the
   *  loop count will be known (and therefore a candidate for compiler
   *  optimizations such as unrolling).
   *
   *  Result may not be in the range [first,last).  Use copy instead.  Note
   *  that the start of the output range may overlap [first,last).
  */
  template <typename _BI1, typename _BI2>
    inline _BI2
    copy_backward(_BI1 __first, _BI1 __last, _BI2 __result)
    {
      // concept requirements
      __glibcxx_function_requires(_BidirectionalIteratorConcept<_BI1>)
      __glibcxx_function_requires(_Mutable_BidirectionalIteratorConcept<_BI2>)
      __glibcxx_function_requires(_ConvertibleConcept<
	    typename iterator_traits<_BI1>::value_type,
	    typename iterator_traits<_BI2>::value_type>)
      __glibcxx_requires_valid_range(__first, __last);

      const bool __bi1 = __is_normal_iterator<_BI1>::__value;
      const bool __bi2 = __is_normal_iterator<_BI2>::__value;
      return std::__copy_backward_normal<__bi1, __bi2>::copy_b_n(__first, __last,
								 __result);
    }

  template<bool>
    struct __fill
    {
      template<typename _ForwardIterator, typename _Tp>
        static void
        fill(_ForwardIterator __first, _ForwardIterator __last,
	     const _Tp& __value)
        {
	  for (; __first != __last; ++__first)
	    *__first = __value;
	}
    };

  template<>
    struct __fill<true>
    {
      template<typename _ForwardIterator, typename _Tp>
        static void
        fill(_ForwardIterator __first, _ForwardIterator __last,
	     const _Tp& __value)
        {
	  const _Tp __tmp = __value;
	  for (; __first != __last; ++__first)
	    *__first = __tmp;
	}
    };

  /**
   *  @brief Fills the range [first,last) with copies of value.
   *  @param  first  A forward iterator.
   *  @param  last   A forward iterator.
   *  @param  value  A reference-to-const of arbitrary type.
   *  @return   Nothing.
   *
   *  This function fills a range with copies of the same value.  For one-byte
   *  types filling contiguous areas of memory, this becomes an inline call to
   *  @c memset.
  */
  template<typename _ForwardIterator, typename _Tp>
    void
    fill(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value)
    {
      // concept requirements
      __glibcxx_function_requires(_Mutable_ForwardIteratorConcept<
				  _ForwardIterator>)
      __glibcxx_requires_valid_range(__first, __last);

      const bool __scalar = __is_scalar<_Tp>::__value;
      std::__fill<__scalar>::fill(__first, __last, __value);
    }

  // Specialization: for one-byte types we can use memset.
  inline void
  fill(unsigned char* __first, unsigned char* __last, const unsigned char& __c)
  {
    __glibcxx_requires_valid_range(__first, __last);
    const unsigned char __tmp = __c;
    std::memset(__first, __tmp, __last - __first);
  }

  inline void
  fill(signed char* __first, signed char* __last, const signed char& __c)
  {
    __glibcxx_requires_valid_range(__first, __last);
    const signed char __tmp = __c;
    std::memset(__first, static_cast<unsigned char>(__tmp), __last - __first);
  }

  inline void
  fill(char* __first, char* __last, const char& __c)
  {
    __glibcxx_requires_valid_range(__first, __last);
    const char __tmp = __c;
    std::memset(__first, static_cast<unsigned char>(__tmp), __last - __first);
  }

  template<bool>
    struct __fill_n
    {
      template<typename _OutputIterator, typename _Size, typename _Tp>
        static _OutputIterator
        fill_n(_OutputIterator __first, _Size __n, const _Tp& __value)
        {
	  for (; __n > 0; --__n, ++__first)
	    *__first = __value;
	  return __first;
	}
    };

  template<>
    struct __fill_n<true>