how to get stl map to construct/destruct inserted object only once.
- by Alberto Toglia
I have found a very prejudicial fact about stl maps. For some reason I cant get objects being inserted in the map to get constructed/destructed only once.
Example:
struct MyObject{
MyObject(){
cout << "constructor" << endl;
}
~MyObject(){
cout << "destructor" << endl;
}
};
int main() {
std::map<int, MyObject> myObjectsMap;
myObjectsMap[0] = MyObject();
return 0;
}
returns:
constructor
destructor
destructor
constructor
destructor
If I do:
typedef std::pair<int, MyObject> MyObjectPair;
myObjectsMap.insert( MyObjectPair(0,MyObject()));
returns:
constructor
destructor
destructor
destructor
I'm inserting Objects responsible for their own memory allocation, so when destructed they'll clean themselves up, being destructed several times is causing me some trouble.
