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## Change Log

### Review Version

Initial review version, for the review conducted from 7th December 2007 to 16th December 2007.

### 1.35.0 Add-on - 31st March 2008

Unofficial release uploaded to vault, to be used with Boost 1.35.0. Incorporated many of the suggestions from the review.

- Improved portability thanks to Boost regression testing.
- Fix lots of typos, and clearer text in the documentation.
- Fix floating point to `std::size_t` conversion when calculating sizes from the max load factor, and use `double` in the calculation for greater accuracy.
- Fix some errors in the examples.

### Boost 1.36.0

First official release.

- Rearrange the internals.
- Move semantics - full support when rvalue references are available, emulated using a cut down version of the Adobe move library when they are not.
- Emplace support when rvalue references and variadic template are available.
- More efficient node allocation when rvalue references and variadic template are available.
- Added equality operators.

### Boost 1.37.0

- Rename overload of `emplace` with hint, to `emplace_hint` as specified in n2691.
- Provide forwarding headers at `<boost/unordered/unordered_map_fwd.hpp>` and `<boost/unordered/unordered_set_fwd.hpp>`.
- Move all the implementation inside `boost/unordered`, to assist modularization and hopefully make it easier to track changes in subversion.

### Boost 1.38.0

- Use `boost::swap`.
- Ticket 2237: Document that the equality and inequality operators are undefined for two objects if their equality predicates aren't equivalent. Thanks to Daniel Krügler.
- Ticket 1710: Use a larger prime number list. Thanks to Thorsten Ottosen and Hervé Brönnimann.
- Use aligned storage to store the types. This changes the way the allocator is used to construct nodes. It used to construct the node with two calls to the allocator's `construct` method - once for the pointers and once for the value. It now constructs the node with a single call to construct and then constructs the value using in place construction.
- Add support for C++0x initializer lists where they're available (currently only g++ 4.4 in C++0x mode).

### Boost 1.39.0

- Ticket 2756: Avoid a warning on Visual C++ 2009.
- Some other minor internal changes to the implementation, tests and documentation.
- Avoid an unnecessary copy in `operator[]`.
- Ticket 2975: Fix length of prime number list.

### Boost 1.40.0

- Ticket 2975: Store the prime list as a preprocessor sequence - so that it will always get the length right if it changes again in the future.
- Ticket 1978: Implement `emplace` for all compilers.
- Ticket 2908, Ticket 3096: Some workarounds for old versions of borland, including adding explicit destructors to all containers.
- Ticket 3082: Disable incorrect Visual C++ warnings.
- Better configuration for C++0x features when the headers aren't available.
- Create less buckets by default.

### Boost 1.41.0 - Major update

- The original version made heavy use of macros to sidestep some of the older compilers' poor template support. But since I no longer support those compilers and the macro use was starting to become a maintenance burden it has been rewritten to use templates instead of macros for the implementation classes.
- The container objcet is now smaller thanks to using `boost::compressed_pair` for EBO and a slightly different function buffer - now using a bool instead of a member pointer.
- Buckets are allocated lazily which means that constructing an empty container will not allocate any memory.