To output the elements (all / subset) in a container (lets say vector), separated by a delimiter, say new line:

#include <algorithm>

std::copy(v.begin(), v.end(), std::ostream_iterator(std::cout, "\n"));

Want to sort an array? No problem …

#include <algorithm>

std::sort(array, array + lengthOfArray);

Read from the standard input into a vector until the end-of-stream?

#include <algorithm>
#include <iterator>
#include <vector>

typedef std::istream_iterator<int> istream_iterator_int;
std::vector<int> v;
istream_iterator_int start (std::cin);
istream_iterator_int end;
std::back_insert_iterator<vector<int> > dest (v);
std::copy (start, end, dest);

Count the no. of instances an object is found?

#include <algorithm>

size_t count = std::count(v.begin(), v.end(), 42); // Returns no. of elements in v with value 42.

And let me inform you… This is just a grain of what STL can do….

References:

http://www.cs.brown.edu/~jak/proglang/cpp/stltut/tut.html

http://www.cplusplus.com/reference/algorithm/

• Language: C++, Operating System: Windows
• Target Audience: Programmers
• Sub Area: Reading ASCII / UTF-8 files from the disk using C++ streams.
• Trouble: How to handle files whose file names contains non-ASCII characters?? (coz ifstream takes a ASCII file path )

Solution:

• Use _wfopen_s(), the safe version of _wfopen(), which takes a wide-character file name & gives a FILE pointer i.e; FILE*.
• Use the obtained FILE* to create a stream, like ifstream in(fp);
• We used wide-character file name & are reading the file byte-by-byte (actually, its char). DONE !!

BTW, I got help from here ! Hope this saves  time for someone out there…