Why does std::remove not work with std::set?

Question

The following code:

#include 
#include 
#include 

std::set s;

int main()
{
    s.insert(1);
    s.in         


        

Answer 1

std::set is ordered container, while std::remove changes order of elements in container placing elements that should be removed to the end, thus it can't be used with ordered containers where elements order is defined by predicate. You need to use:

s.erase( 1);

To remove 1 from set.