Re: How to get the iterator for a value less than the key specified?
In article <1149705725.330627.276230@h76g2000cwa.googlegroups.com>,
Albert Jin <albert.jin@gmail.com> wrote:
Neither of the two methods, lower_bound and upper_bound, for std::set
does return the iterator less than the key specified. Is there a
better way to approach this?
template <typename Set>
typename Set::const_reverse_iterator less_lower_bound(Set const & set,
typename Set::const_reference key) {
Set::key_compare key_comp = set.key_comp();
Set::const_reverse_iterator i = set.rbegin();
for (; i != set.rend(); ++i) {
if (!key_comp(key, *i)) {
break;
}
}
return i;
}
why not
template <typename Set>
typename Set::iterator least_less(Set const &set,typename
Set::const_reference key)
{
typename Set::iterator it = set.lower_bound(key);
if(it != set.begin())
return --it;
else
return set.end();
}
if set.end() there is no entry less than key .
??
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