Debugging question

[dekeenfrance]

Hello,

I am writing a program of scientific simulation on Visual Studio. In my simulation there is a big vector of pointers who point to a big number of objects each one consists of some vectors.

When I run the simulation, sometimes it works normally, sometimes it throw an exception by citing "Vector iterator out of range" or "vector iterator not dereferencable".

The code is very long so I cannot put it here. I just put a fraction of the debug file called "vector" automatically made by Visual Studio. Because I don't know what it means and how I can find my error through this.

Could someone knows this please tell me how to debug this error? Thanks in advance.

	_Myiter& operator+=(difference_type _Off)
		{	// increment by integer
 #if _ITERATOR_DEBUG_LEVEL == 2
		if (this->_Getcont() == 0
			|| this->_Ptr + _Off < ((_Myvec *)this->_Getcont())->_Myfirst
			|| ((_Myvec *)this->_Getcont())->_Mylast < this->_Ptr + _Off)
			{	// report error
			_DEBUG_ERROR("vector iterator + offset out of range");
			_SCL_SECURE_OUT_OF_RANGE;
			}

[cire]

The error is a logic error in your code, not that of std::vector.

[dekeenfrance]

Could you please explain a bit more?

[toum]

The code you're showing us is the part of code of std::vector that displays an error if ever the call to the iterator's operator+=() causes the iterator to be out of range.

You need to find the part of your code that tried to increment an iterator just before the error occured.