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Iterator Library ostream_iterator in C++ Programming Language

Iterator Library ostream_iterator in C++
Ostream iterators are output iterators that write sequentially to an output stream (such as cout). They are constructed from a basic_ostream object, to which they become associated, so that whenever an assignment operator (=) is used on the ostream_iterator (dereferenced or not) it inserts a new element into the stream. Optionally, a delimiter can be specified on construction. This delimiter is written to the stream after each element is inserted.
Syntax for Iterator ostream_iterator in C++
#include <iterator> template <class T, class charT=char, class traits=char_traits<charT> > class ostream_iterator;
Element type for the iterator: The type of elements inserted into the stream
First template parameter of the associated basic_ostream object: The type of elements the stream handles (char for ostream).
Second template parameter of the associated basic_ostream: Character traits for the elements the stream handles. The default template arguments correspond to an instantiation that uses an ostream object as associated stream.
Member types
Member types & definition in istream_iterator ostream_type: basic_ostream<charT,traits> --- Type of the associated output stream iterator_category: output_iterator_tag --- Input iterator value_type: void char_type: charT --- Type of the characters handled by the associated stream traits_type: traits --- Character traits for associated stream difference_type: void pointer: void reference: void
Member functions
• (constructor) Construct ostream iterator (public member function ) • operator* Dereference iterator (public member function ) • operator++ Increment iterator (public member function ) • operator= Assignment operator (public member function )
/* C++ ostream_iterator is a special output iterator that write sequentially to an output stream. */ /* ostream_iterator class template - Output iterator to write items to an ostream */ /* C++ code example to illustrate read a bunch of strings from a file sort them lexicographically and print them to output stream */ #include <algorithm> #include <fstream> #include <iostream> #include <iterator> #include <string> #include <vector> using namespace std; int main() { // Define a vector to store the strings received from input vector<string> strings_v; // Define the filestream object used to read data from file ifstream fin("input_file.txt"); // Get input stream and end of stream iterators istream_iterator<string> fin_it(fin); istream_iterator<string> eos; // Get output stream iterators ostream_iterator<string> cout_it(cout, " "); // Copy elements from input to vector using copy function copy(fin_it, eos, back_inserter(strings_v)); // Sort the vector sort(strings_v.begin(), strings_v.end()); // Copy elements from vector to output copy(strings_v.begin(), strings_v.end(), cout_it); return 0; }

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In this C++ example, we have "two functions" one gets the values from user, assign them to structure members and returns the structure and the other function takes that structure as