更简单的std :: unordered_map :: insert形式？

Question

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
}

Answer 1

How about just:

if(!_tileTypes.insert(std::make_pair(val1, vla2)).second) {
    // insert did not succeed
}

Answer 2

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);