Using vector as a buffer without initializing it on resize()

Question

I want to use vector as a buffer. The interface is perfect for my needs, but there\'s a performance penalty when resizing it beyond its current size

Answer 1

There's nothing in the standard library that meets your requirements, and nothing I know of in boost either.

There are three reasonable options I can think of:

• Stick with std::vector for now, leave a comment in the code and come back to it if this ever causes a bottleneck in your application.
• Use a custom allocator with empty construct/destroy methods - and hope your optimiser will be smart enough to remove any calls to them.
• Create a wrapper around a a dynamically allocated array, implementing only the minimal functionality that you require.