Thread: vector resizing

Originally Posted by dwks

Yes, but my vector isn't resizing at all. I get a segmentation fault!

This:

Code:

v[x]

calls the operator[]() function. Like an array, a vector indexes its elements, and if the index doesn't exist then the operator[]() function fails.

Vectors grow automatically in size when you add elements to the vector. There are several functions defined to allow you to add elements to a vector. However, operator[]() does not add elements to the vector--it tries to access elements that already exist. In a map<>, operator[]() does add elements to the map, but it doesn't work the same way with a vector.

If you want to add elements to a vector, then you have to use functions that do that.