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QUESTION
I've noticed that unordered_map::equal_range upper_bound (first) returns end if passed key is less than map's first one
...ANSWER
Answered 2019-Apr-25 at 11:15This happens because an unordered_map
is, not too surprisingly, unordered.
See §22.2.7 [unord.req], Table 70, regarding the requirements on equal_range
:
Returns: A range containing all elements with keys equivalent to
k
. Returnsmake_pair(b.end(), b.end())
if no such elements exist.
This is different from the requirements on an ordered associative container, like std::map
, where equal_range
is defined in terms of lower_bound
and upper_bound
.
std::unordered_map
doesn't have lower_bound
and upper_bound
, for obvious reasons.
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