...one of the most highly
regarded and expertly designed C++ library projects in the
world. — Herb Sutter and Andrei
boost::algorithm::replace_head — Replace head algorithm.
template<typename SequenceT, typename RangeT> void replace_head(SequenceT & Input, int N, const RangeT & Format);
Replace the head of the input with the given format string. The head is a prefix of a string of given size. If the sequence is shorter then required, the whole string is considered to be the head. The input sequence is modified in-place.