Michael Gottesman 7248221d40 [stl-extras] Provide next_or_default and prev_or_default helpers for iterators. ...

These work like next_or_end or prev_or_begin, except that instead of forcing the
default value to be the compared against the value, you can specify the value
used upon going out of range.

i.e., instead of:

(x, y) -> (x == y) ? y : std::next(x)

We have:

(x, y, z) -> (x == y) ? z : std::next(x)

This is a strict generalization of next_or_end and prev_or_begin so I
re-implemented both routines in terms of the new routines, so no source needed
to be updated.

2017-09-09 16:23:12 -07:00

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