Is there an easier way to check whether an std::unordered_map::insert call succeeded than writing this mammoth block of code?
std::pair< T1, T2 > pair(val1, val2); std::pair< std::unordered_map< T1, T2 >::const_iterator, bool> ret = _tileTypes.insert(pair); if(!ret.second) { // insert did not succeed } How about just:
if(!_tileTypes.insert(std::make_pair(val1, vla2)).second) { // insert did not succeed } 
if (!_tileTypes.insert(pair).second) ?
Alternatively, typedefs can be useful to tidy this sort of thing up.
Also, if you're using C++11, then you can use the auto keyword to infer the type:
auto ret = _tileTypes.insert(pair); 
.first after checking .second, you can use auto to simplify the long return value type.