-
Default constructors don't allocate memory which improves performance and
usually implies a no-throw guarantee (if predicate's or allocator's default
constructor doesn't throw).
-
Small string optimization for
basic_string,
with an internal buffer of 11/23 bytes (32/64 bit systems) without
increasing the usual sizeof
of the string (3 words).
-
[multi]set/map
containers are size optimized embedding the color bit of the red-black
tree nodes in the parent pointer.
-
[multi]set/map
containers use no recursive functions so stack problems are avoided.
