How to change size of STL container in C++
- by Jaime Pardos
I have a piece of performance critical code written with pointers and dynamic memory.
I would like to rewrite it with STL containers, but I'm a bit concerned with performance. Is there a way to increase the size of a container without initializing the data?
For example, instead of doing
ptr = new BYTE[x];
I want to do something like
vec.insert(vec.begin(), x, 0);
However this initializes every byte to 0. Isn't there a way to just make the vector grow?
I know about reserve() but it just allocates memory, it doesn't change the size of the vector, and doesn't allows me to access it until I have inserted valid data.
Thank you everyone.
