Should std::sort work with lambda function in c++0x/c++11?

Question

I tried to use lambda function with sort, but was getting \"Segmentation fault\" errors. I managed to simplify the code to the following:

#inclu         


        

Answer 1

The comparison predicate should return a bool: true if a < b and false otherwise. Change the return statement to:

  return a < b;

Not to be confused with C-style 3-way comparison functions.

NOTE: Though C++20 does introduce a 3-way comparison operator <=>, sort would still expect a 2-way compare predicate.