maps are sorted base on key. I think his trying to sort the value. ..
Alternative solution.
/* ugly coding */
template <template <typename ELEM,typename = std::allocator<ELEM> >
class CONT,
class T, class U>
inline CONT<U> getValues(const boost::unordered_map<T, U>& data)
{
CONT<U> retCont;
typedef typename boost::unordered_map<T, U>::value_type value_type;
BOOST_FOREACH(value_type val, data)
{
retCont.push_back(val.second);
}
return retCont;
}
std::vector<int> countriesValue = getValues<std::vector, int, int>(countries);
std::sort(countriesValue.begin(), countriesValue.end());
On 8/8/07, Cory Nelson <phrosty@gmail.com> wrote:
On 8/8/07, Olaf van der Spek <olafvdspek@gmail.com
> wrote:
> Hi,
>
> I'm trying to sort a map based on second, but I get all kinds of
> compiler errors and I have no idea what's wrong. A simple _1 > _2
> works fine, but that compares the maps themselves.
>
> Also, is there a better way to write the copy from map to vector or to
> sort the map in general?
maps are already sorted! see the third template argument. a simple
vec.insert(vec.end(),
map.begin(), map.end()) will copy it. did you
need something else?
--
Cory Nelson
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