I'm trying to copy a list of objects from class that was created by me using the std::copy C++ function, but the function crashes with the next error message:
Unhandled exception at 0x00007FFA91BAC570 (msvcr120.dll) in MyProject.exe: 0xC0000005: Access violation reading location 0xFFFFFFFFFFFFFFFF.
The class is pretty simple and I have no idea what can cause the copy function to crash with such error. The class looks as follow:
class XMLObjects
{
private:
int id;
string name;
int leftUpCornerX;
int leftUpCornerY;
int rightDownCornerX;
int rightDownCornerY;
bool isFound; //it's true if this object was found in the OR file and in the GT file
public:
XMLObjects(){}
XMLObjects(int _id){ id = _id; }
XMLObjects(int _id, string _name, int _leftUpCornerX, int _leftUpCornerY, int _rightDownCornerX, int _rightDownCornerY) { id = _id; name = _name; leftUpCornerX = _leftUpCornerX; leftUpCornerY = _leftUpCornerY; rightDownCornerX = _rightDownCornerX; rightDownCornerY = _rightDownCornerY; isFound = false; }
~XMLObjects(){}
void setID(int _id){ id = _id; }
void setName( string _name){ name=_name; }
void setLeftUpCorner(int _leftUpCornerX, int _leftUpCornerY){ leftUpCornerX = _leftUpCornerX; leftUpCornerY = _leftUpCornerY; }
void setRightDownCorner(int _rightDownCornerX, int _rightDownCornerY){ rightDownCornerX = _rightDownCornerX; rightDownCornerY = _rightDownCornerY; }
void objectWasFound(){ isFound = true; }
int getID(){ return id; }
string getName(){ return name; }
int getLeftUpCornerX(){ return leftUpCornerX; }
int getLeftUpCornerY(){ return leftUpCornerY; }
int getRightDownCornerX(){ return rightDownCornerX; }
int getRightDownCornerY(){ return rightDownCornerY; }
bool isObjectFound(){ return isFound; }
};
The call to the copy function looks as follow:
list<XMLObjects> objects;
objects.push_front(obj1);
objects.push_front(obj2);
objects.push_front(obj3);
list<XMLObjects> NewObjectsList;
std::copy(objects.begin(), objects.end(), NewObjectsList.begin());
Can anyone help?
std::copy
doesn't resize output, so you have to resize your container before or use special iterator which insert element.
You may use following code.
std::copy(objects.begin(), objects.end(),
std::inserter(NewObjectsList, NewObjectsList.end()));
As noted in comment, in your case, you may directly do a copy:
list<XMLObjects> NewObjectsList = objects;
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