Erasing an element from a container while inside a range-based for loop

Question

I want to erase an element from a container which is being currently used within a ranged-based for loop. Will this cause undefined behaviour? Or will the next value of

Answer 1

It should be a undefined behavior. Because according to 14882/2011 the range-based for statement is equivalent to:

auto && __range = range-init;
for ( auto __begin = begin-expr(__range),
   __end = end-expr(__range);
   __begin != __end;
   ++__begin ) {
   for-range-declaration = *__begin;
   statement
}