如何使用 gdb 在带有 vscode 的向量中查看迭代器指向的元素？

Question

I'm trying out VSCode writing some C++ using gdb, and I am finding that I need to determine what element an iterator is pointing at for a particular vector . Is there some way of doing this?

Answer 1

If you're trying to do this as part of your program, you can use STL:

int distance = std::distance(begin(s), result);

If you're trying to do this using the watch window in VSCode, the above will not work, as it's calling a function. Since the underlying structure of a vector is an array, you can use math instead. In the watch window, add:

(&(*myIterator) - &(myVector[0])) / sizeof(myVector[0])