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@@ -49,9 +49,13 @@ In short, what does [*Boost.Container] offer?
[section:introduction_building_container Building Boost.Container]
There is no need to compile [*Boost.Container], since it's
a header only library. Just include your Boost header directory in your
compiler include path.
There is no need to compile [*Boost.Container] if you don't use [link container.extended_functionality.extended_allocators Extended Allocators]
since in that case it's a header-only library. Just include your Boost header directory in your compiler include path.
[link container.extended_functionality.extended_allocators Extended Allocators] are
implemented as a separately compiled library, so you must install binaries in a location that can be found by your linker
when using these classes. If you followed the [@http://www.boost.org/doc/libs/release/more/getting_started/index.html Boost Getting Started] instructions,
that's already been done for you.
[endsect]
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@@ -148,12 +152,19 @@ today, in fact, implementors would have to go out of their way to prohibit it!]]
C++11 standard is also cautious about incomplete types and STL: ["['17.6.4.8 Other functions (...) 2.
the effects are undefined in the following cases: (...) In particular - if an incomplete type (3.9)
is used as a template argument when instantiating a template component,
unless specifically allowed for that component]]. Fortunately [*Boost.Container] containers are designed
to support type erasure and recursive types, so let's see some examples:
unless specifically allowed for that component]].
Fortunately all [*Boost.Container] containers except
[classref boost::container::static_vector static_vector] and
[classref boost::container::basic_string basic_string] are designed to support incomplete types.
[classref boost::container::static_vector static_vector] is special because
it statically allocates memory for `value_type` and this requires complete types and
[classref boost::container::basic_string basic_string] implements Small String Optimization which
[*Effects]: Inserts elements in the range [first, last) before position and removes the elements from x.
[*Requires]: [first, last) is a valid range in x. The result is undefined if position is an iterator in the range [first, last). Invalidates only the iterators and references to the spliced elements. n == distance(first, last).
[*Throws]: Nothing.
[*Complexity]: Constant time.
]
This new splice signature allows the client to pass the distance of the input range in.
This information is often available at the call site. If it is passed in,
then the operation is constant time, even with an O(1) size.
[*Boost.Container] implements this overload for `list` and a modified version of it for `slist`
(as `slist::size()` is also `O(1)`).
[endsect]
[section:extended_allocators Extended allocators]
Many C++ programmers have ever wondered where does good old realloc fit in C++. And that's a good question.
Could we improve [classref boost::container::vector vector] performance using memory expansion mechanisms
to avoid too many copies? But [classref boost::container::vector vector] is not the only container that
could benefit from an improved allocator interface: we could take advantage of the insertion of multiple
elements in [classref boost::container::list list] using a burst allocation mechanism that could amortize
costs (mutex locks, free memory searches...) that can't be amortized when using single node allocation
strategies.
These improvements require extending the STL allocator interface and use make use of a new
general purpose allocator since new and delete don't offer expansion and burst capabilities.
* [*Boost.Container] containers support an extended allocator interface based on an evolution of proposals
[@http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1953.html N1953: Upgrading the Interface of Allocators using API Versioning],
allocator, similar to [*Boost.Pool] that takes advantage of the modified DLMalloc burst interface. It does not return
memory to the DLMalloc allocator (and thus, to the system), unless explicitly requested. It does offer a very small
memory overhead so it's suitable for node containers ([boost::container::list list], [boost::container::slist slist]
[boost::container::set set]...) that allocate very small `value_type`s and it offers improved node allocation times
for single node allocations with respecto to [classref boost::container::allocator allocator].
* [classref boost::container::adaptive_pool adaptive_pool]: It's a low-overhead node allocator that can return memory
to the system. The overhead can be very low (< 5% for small nodes) and it's nearly as fast as [classref boost::container::node_allocator node_allocator].
It's also suitable for node containers.
[endsect]
[/
/a__section:previous_element_slist Previous element for slist__a
/
/The C++11 `std::forward_list` class implement a singly linked list, similar to `slist`, and these
/containers only offer forward iterators and implement insertions and splice operations that operate with ranges
/to be inserted ['after] that position. In those cases, sometimes it's interesting to obtain an iterator pointing
/to the previous element of another element. This operation can be implemented
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