Sort a vector of struct based on a specific field

Question

Currently I am trying to sort a vector of structs based on a specific field. I have set up a custom comparison function for the use of the sort function. However, i am getti

Answer 1

a) Use sort function with lambda notation as below( if you are using c++11)

 sort(vecData.begin(),vecData.end(), [](const Play &x, const Play &y){ return (x.relevance < y.relevance);});

Working code:

http://ideone.com/bDOrBV

b) Make comparator function as static

http://ideone.com/0HsaaH

Answer 2

Although this is an old question, I would like to note for the benefit of the future readers the possibility of directly sorting according to a specific field with the help of projections in the upcoming Ranges library in C++20:

ranges::sort(vecData, ranges::less, &Play::relevance);

This avoids the need of specifying two iterators or writing a custom comparison function or lambda.

Answer 3

static bool customCompare(const Play &x, const Play &y)