std::fill has a companion function std::fill_n, which replaces the "last"
iterator with a size "n".  Likewise, std::generate has a similar companion
that also takes a single output iterator instead of a pair of forward
iterators.

Why don't functions that take input iterators also have _n companions that
replace the "last" input iterator with a size "n"?  An example might be
std::copy_n(InIt first, Size n, OutIt result).

I checked "The C++ Programming Language", 3rd edition, but couldn't find any
rationale.




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