I have a c++ program which take a map text file and output it to a graph data structure I have made, I am using QT as I needed cross-platform program and GUI as well as visual representation of the map. I have several maps in different sizes (8x8 to 4096x4096). I am using unordered_map with a vector as key and vertex as value, I'm sending hash(1) and equal functions which I wrote to the unordered_map in creation.

Under QT I am debugging my program with QT 4.8.1 for desktop MinGW (QT SDK), the program works and debug well until I try the largest map of 4096x4096, then the program stuck with the following error: "the inferior stopped because it received a signal from operating system", when debugging, the program halt at the hash function which used inside the unordered_map and not as part of the insertion state, but at a getter(2).

Under Netbeans IDE 7.2 and Cygwin4 all works fine (debug and run).

• some code info:

  typedef std::vector<double> coordinate;
  

  typedef std::unordered_map<coordinate const*, Vertex<Element>*, container_hash, container_equal> vertexsContainer;

  vertexsContainer *m_vertexes

(1) hash function:

struct container_hash
{
    size_t operator()(coordinate const *cord) const
    {
        size_t sum = 0;
        std::ostringstream ss;

        for ( auto it = cord->begin() ; it != cord->end() ; ++it )
        {
           ss << *it;
        }

        sum = std::hash<std::string>()(ss.str());
        return sum;
    }
};

(2) the getter:

template <class Element>
Vertex<Element> *Graph<Element>::getVertex(const coordinate &cord)
{
    try
    {
        Vertex<Element> *v = m_vertexes->at(&cord);
        return v;
    }
    catch (std::exception& e)
    {
        return NULL;
    }
}

• I was thinking maybe it was some memory issue at the beginning, so before I was thinking of trying Netbeans I checked it with QT on my friend pc with a 16GB RAM and got the same error.

Thanks.