Error 'no match for call to vector<int> normal_iterator<int*, vector<int> >::difference_type)'

Question

I'm trying to use this vector.h function:

 random_shuffle(s.begin()+from+i,s.begin()+to,s);

This error happens:

c:\program files (x86)\codeblocks\mingw\bin\..\lib\gcc\mingw32\4.7.1\include\c++\bits\stl_algo.h|5255|error: no match for call to '(std::vector<int>) (__gnu_cxx::__normal_iterator<int*, std::vector<int> >::difference_type)'|

Any idea? Thank in advance!

Answer 1

The third parameter to std::random_shuffle (assuming you are talking about that, if not, please clarify your question) must be a

function object returning a randomly chosen value of type convertible to std::iterator_traits<RandomIt>::difference_type in the interval [0,n) if invoked as r(n)

(from here ), not a vector. You probably meant to use the two argument variant of the function:

random_shuffle(s.begin()+from+i,s.begin()+to);

Also, please note that std::random_shuffle is obsolete. You should be using std::shuffle instead.