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f.format(t, fc)

FC​::​iterator

Formats t according to the specifiers stored in *this, writes the output to fc.out(), and returns an iterator past the end of the output range.

The output shall only depend on t, fc.locale(), fc.arg(n) for any value n of type size_t, and the range [pc.begin(), pc.end()) from the last call to f.parse(pc).