Hi

how to call and use the return value of:

----

void SDatabase::getNdb(const std::string &id, StdWaypointList *list)
{
int cnt = m_ndb_map.count(id);
if (cnt != 0) {
NdbMapIterator it = m_ndb_map.find(id);
int i;
for (i = 0; i < cnt; i++) {
Waypoint *wpt = (*it).second->asWaypoint();
list->push_back(wpt);
it++;
}
}
};

-----

If I try like:

StdWaypointList *testlist;
it4->second = SDatabase::getNdb(msg,testlist);

I get:

void value not ignored as it ought to be

Many thanks

The function doesn't return anything, so there's no return value to assign or use.

yes I see void but how should it be used then? Rewrite returning StdWaypointList? How to call it?

I have no idea what that function is, but if it takes two parameters and returns nothing, then that is apparently how it should be used. What do you expect it to return since you assign its apparent return value to something?

Seems like the possibly undocumented/badly named method needs to return more than 1 thing and thats why those are put into the list it takes as second argument, but OP didnt look closely enough to notice.

           StdWaypointList *testlist;
           SDatabase::getNdb(msg,testlist);
           // now check whats inside the testlist and use it

Howsabout

SDatabase::getNdb(msg, &it4->second);

that returns:

Multiple markers at this line
- Invalid arguments ' Candidates are: void getNdb(const std::basic_string<char,std::char_traits<char>,std::allocator<char>> &,
std::vector<Waypoint *,std::allocator<Waypoint *>> *) '
- no matching function for call to ‘SDatabase::getNdb(const char*&, Ndb**)’

the declaration:

typedef vector<Waypoint*> StdWaypointList;

Thanks for ideas.

Yes, but how? I only see in another function:

Waypoint wpt = parseWaypoint(subElem, Waypoint::FLAG_SID);

Cannot find any StdWaypointList. Probably that's the function doing? Does it need a return value to increment the list?

As for it4 I do before calling that getNdb:

for (multimap<string, Ndb*>::iterator it4 = m_ndb_map.begin() ; it4 != m_ndb_map.end(); ++it4)
{

Thanks again