Where is the call in std :: map :: operator [] in this code?

Question

In my code there is the following typedef:

typedef unsigned long int ulint;
typedef std::map<ulint, particle> mapType;
typedef std::vector< std::vector<mapType> > mapGridType;

particle - This is a custom class without a default constructor.

VS2008 gives me an error in this code:

std::set<ulint> gridOM::ids(int filter)
{
    std::set<ulint> result;
    ulint curId;
    for ( int i = 0; i < _dimx; ++i ) {
        for ( int j = 0; j < _dimy; ++j ) {
            // next line is reported to be erroneous
            for ( mapType::iterator cur = objectMap[i][j].begin(); cur != objectMap[i][j].end(); ++cur )
            {
                curId = (*cur).first;
                if ( (isStatic(curId) && filter != 2) || (!isStatic(curId) && filter != 1) )
                {
                    result.insert(curId);
                }
            }
        }
    }
    return result;
}

objectMapis an object mapGridType. The error is being read:

error C2512: 'gridOM::particle::particle' : no appropriate default constructor available
while compiling class template member function 'gridOM::particle &std::map<_Kty,_Ty>::operator [](const unsigned long &)'  
        with  
        [  
            _Kty=ulint,  
            _Ty=gridOM::particle  
        ]  
        .\gridOM.cpp(114) : see reference to class template   instantiation 'std::map<_Kty,_Ty>'   being compiled  
        with  
        [  
            _Kty=ulint,  
            _Ty=gridOM::particle  
        ]  

Correct me if I am wrong, but the code above should not ring at all map::operator[]. The first call operator[]is performed in vector< vector<mapType> >and returns a vector<mapType>, the second is in vector<mapType>and returns a mapTypeaka a map<ulint, particle>, and I call only begin()and endon this map. So why am I getting an error trying to compile operator[]for map?

Answer 1

. , operator[], , . -, VS mapType , .

Answer 2

. , , ( ). , , .

?

EDIT ! , . ( [], ), , .

Answer 3

, , for GCC Comeau (Onlie). VS2008, .

for, . , std::map<>::begin() std::map<>::end() - std::map<>::operator[]() VS2008, .