Question

I have a vector of booleans. I need to set its elements from n-th to m-th to true. Is there an elegant way to do this without using a loop?

Edit: Tanks to all those who pointed out the problems with using vector<bool>. However, I was looking for a more general solution, like the one given by jalf.

Answer 1

std::fill or std::fill_n in the algorithm header should do the trick.

 // set m elements, starting from myvec.begin() + n to true
std::fill_n(myvec.begin() + n, m, true);

// set all elements between myvec.begin() + n and myvec.begin() + n + m to true
std::fill(myvec.begin() + n, myvec.begin() + n + m, true);