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STL and most other containers value initialize new elements in common operations
like vector::resize(size_type n)
or explicit
vector::vector(size_type n)
.
In some performance-sensitive environments, where vectors are used as a replacement for variable-size buffers for file or network operations, value initialization is a cost that is not negligible as elements are going to be overwritten by an external source shortly after new elements are added to the container.
Boost.Container offers two new members for
vector
, static_vector
and stable_vector
: explicit container::container(size_type n, default_init_t)
and explicit
container::resize(size_type n, default_init_t)
, where new elements are constructed using
default
initialization.