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ostream_iterator (3)
  • >> ostream_iterator (3) ( Solaris man: Библиотечные вызовы )
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                           Standard C++ Library
                 Copyright 1998, Rogue Wave Software, Inc.
    
    
    NAME
         ostream_iterator
    
          - Stream iterators allow for use of iterators with ostreams
         and  istreams.  They  allow  generic  algorithms  to be used
         directly on streams.
    
    
    
    SYNOPSIS
         #include <ostream>
         template <class T, class charT,
                  class traits = char_traits<charT> >
         class ostream_iterator
          : public iterator<output_iterator_tag,void,void>;
    
    
    
    DESCRIPTION
         Stream iterators use the  standard  iterator  interface  for
         input and output streams.
    
         The class ostream_iterator  writes  elements  to  an  output
         stream.  If you use the constructor that has a second char *
         argument, then that string is written  after  every  element
         (the  string  must  be  null-terminated).  Since  an ostream
         iterator is an output iterator, it is not possible to get an
         element out of the iterator. You can only assign to it.
    
    
    
    INTERFACE
         template <class T, class charT,
                  class traits = char_traits<charT> >
         class ostream_iterator
            : public iterator<output_iterator_tag,void,void>
         {
         public:
    
          typedef T value_type;
          typedef charT char_type;
          typedef traits traits_type;
          typedef basic_ostream<charT,traits> ostream_type;
    
    
            ostream_iterator(ostream&);
            ostream_iterator (ostream&, const char*);
            ostream_iterator (const
                    ostream_iterator<T,charT,char_traits<charT> >&);
             ~ostream_itertor ();
            ostream_iterator<T,charT,char_traits<charT> >&
                 operator=(const T&);
            ostream_iterator<T,charT,char_traits<charT> >&
                 operator* () const;
            ostream_iterator<T,charT,char_traits<charT> >&
                 operator++ ();
            ostream_iterator<T,charT,char_traits<charT> >
                 operator++ (int);
          };
    
    
    
    TYPES
         value_type;
    
    
            Type of value to stream in.
    
    
    
         char_type;
    
    
            Type of character the stream is built on.
    
    
    
         traits_type;
    
    
            Traits used to build the stream.
    
    
    
         ostream_type;
    
    
            Type of stream this iterator is constructed on.
    
    
    
    CONSTRUCTORS
         ostream_iterator (ostream& s);
    
            Constructs an_ostream_iterator on the given stream.
    
    
    
         ostream_iterator (ostream& s, const char* delimiter);
    
    
            Constructs an_ostream_iterator on the given  stream.  The
            null terminated string delimiter is written to the stream
            after every element.
    
    
    
         ostream_iterator (const ostream_iterator<T>& x);
    
    
             Copy constructor.
    
    
    
    DESTRUCTORS
         ~ostream_iterator ();
    
    
            Destroys an object of class ostream_iterator.
    
    
    
    OPERATORS
         const T& <br>operator= (const T& value);
    
    
             Shift the value T onto the output stream.
    
    
    
         const T& ostream_iterator<T>&
         operator* ();
         ostream_iterator<T>&
         operator++();
         ostream_iterator<T>
         operator++ (int);
    
    
            These operators do nothing. They simply allow the  itera-
            tor to be used in common constructs.
    
    
    EXAMPLE
          #include <iterator>
          #include <numeric>
          #include <deque>
          #include <iostream>
         using namespace std;
    
         int main ()
          {
            //
            // Initialize a vector using an array.
            //
           int arr[4] = { 3,4,7,8 };
           int total=0;
           deque<int> d(arr+0, arr+4);
            //
            // stream the whole vector and a sum to cout
            //
           copy(d.begin(),d.end()-1,
                 ostream_iterator<int,char>(cout," + "));
           cout << *(d.end()-1) << " = " <<
                accumulate(d.begin(),d.end(),total) << endl;
           return 0;
          }
    
    
    
    WARNINGS
         If your compiler does not support default  template  parame-
         ters,  then you always need to supply the Allocator template
         argument. For instance, you need to write:
    
         deque<int, allocator<int> >
    
         instead of:
    
         deque<int>
    
         If your compiler does not support namespaces,  then  you  do
         not need the using declaration for std.
    
    
    
    SEE ALSO
         istream_iterator, Iterators
    
    
    
    


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