[/ Copyright 2005-2008 Daniel James.
 / Distributed under the Boost Software License, Version 1.0. (See accompanying
 / file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) ]

[template ticket[number]'''<ulink url="https://svn.boost.org/trac/boost/ticket/'''[number]'''">'''#[number]'''</ulink>''']

[section:changes Change Log]

[h2 Boost 1.33.0]

* Initial Release

[h2 Boost 1.33.1]

* Fixed the points example, as pointed out by 沈慧峰.

[h2 Boost 1.34.0]

* Use declarations for standard classes, so that the library
  doesn't need to include all of their headers
* Deprecated the `<boost/functional/hash/*.hpp>` headers. Now a single header,
  <[headerref boost/functional/hash.hpp]> is used.
* Add support for the `BOOST_HASH_NO_EXTENSIONS` macro, which
  disables the extensions to TR1.

* Minor improvements to the hash functions for floating point numbers.
* Update the portable example to hopefully be more generally portable.

[h2 Boost 1.34.1]

* [@http://svn.boost.org/trac/boost/ticket/952 Ticket 952]:
  Suppress incorrect 64-bit warning on Visual C++.

[h2 Boost 1.35.0]

* Support for `long long`, `std::complex`.
* Improved algorithm for hashing floating point numbers:
  * Improved portablity, as described by Daniel Krügler in
    [@http://lists.boost.org/boost-users/2005/08/13418.php
    a post to the boost users list].
  * Fits more information into each combine loop, which can reduce the
    the number of times combine is called and hopefully give a better
    quality hash function.
  * Improved the algorithm for hashing floating point numbers.
  * On Cygwin use a binary hash function for floating point numbers, as
    Cygwin doesn't have decent floating point functions for `long double`.
  * Never uses `fpclass` which doesn't support `long double`.
  * [@http://svn.boost.org/trac/boost/ticket/1064 Ticket 1064]:
    Removed unnecessary use of `errno`.
* Explicitly overload for more built in types.
* Minor improvements to the documentation.
* A few bug and warning fixes:
  * [@http://svn.boost.org/trac/boost/ticket/1509 Ticket 1509]:
    Suppress another Visual C++ warning.
  * Some workarounds for the Sun compilers.

[h2 Boost 1.36.0]

* Stop using OpenBSD's dodgy `std::numeric_limits`.
* Using the boost typedefs for `long long` and `unsigned long long`.
* Move the extensions into their own header.

[h2 Boost 1.37.0]

* [@http://svn.boost.org/trac/boost/ticket/2264 Ticket 2264]:
  In Visual C++, always use C99 float functions for `long double` and `float` as
  the C++ overloads aren't always availables.

[h2 Boost 1.38.0]

* Changed the warnings in the deprecated headers from 1.34.0 to errors. These
  will be removed in a future version of Boost.
* Moved detail headers out of `boost/container_hash/detail`, since they are part of
  functional/hash, not container_hash. `boost/container_hash/detail/container_fwd.hpp`
  has been moved to `boost/detail/container_fwd.hpp` as it's used outside of
  this library, the others have been moved to `boost/functional/hash/detail`.

[h2 Boost 1.39.0]

* Move the hash_fwd.hpp implementation into the hash subdirectory, leaving a
  forwarding header in the old location. You should still use the old location,
  the new location is mainly for implementation and possible modularization.
* [@https://svn.boost.org/trac/boost/ticket/2412 Ticket 2412]: Removed deprecated
  headers.
* [@https://svn.boost.org/trac/boost/ticket/2957 Ticket 2957]: Fix configuration
  for vxworks.

[h2 Boost 1.40.0]

* Automatically configure the float functions using template metaprogramming
  instead of trying to configure every possibility manually.
* Workaround for when STLport doesn't support long double.

[h2 Boost 1.42.0]

* Reduce the number of warnings for Visual C++ warning level 4.
* Some code formatting changes to fit lines into 80 characters.
* Rename an internal namespace.

[h2 Boost 1.43.0]

* [@https://svn.boost.org/trac/boost/ticket/3866 Ticket 3866]:
  Don't foward declare containers when using gcc's parallel library,
  allow user to stop forward declaration by defining the
  `BOOST_DETAIL_NO_CONTAINER_FWD` macro.
* [@https://svn.boost.org/trac/boost/ticket/4038 Ticket 4038]:
  Avoid hashing 0.5 and 0 to the same number.
* Stop using deprecated `BOOST_HAS_*` macros.

[h2 Boost 1.44.0]

* Add option to prevent implicit conversions when calling `hash_value` by
  defining `BOOST_HASH_NO_IMPLICIT_CASTS`. When using `boost::hash`
  for a type that does not have `hash_value` declared but does have
  an implicit conversion to a type that does, it would use that
  implicit conversion to hash it. Which can sometimes go very wrong,
  e.g. using a conversion to bool and only hashing to 2 possible
  values. Since fixing this is a breaking change and was only
  approached quite late in the release cycle with little discussion
  it's opt-in for now. This, or something like it, will become the
  default in a future version.

[h2 Boost 1.46.0]

* Avoid warning due with gcc's `-Wconversion` flag.

[h2 Boost 1.50.0]

* [@http://svn.boost.org/trac/boost/ticket/6771 Ticket 6771]:
  Avoid gcc's `-Wfloat-equal` warning.
* [@http://svn.boost.org/trac/boost/ticket/6806 Ticket 6806]:
  Support `std::array` and `std::tuple` when available.
* Add deprecation warning to the long deprecated
  `boost/container_hash/detail/container_fwd.hpp`.

[h2 Boost 1.51.0]

* Support the standard smart pointers.
* `hash_value` now implemented using SFINAE to avoid implicit casts to built
  in types when calling it.
* Updated to use the new config macros.

[h2 Boost 1.52.0]

* Restore `enum` support, which was accidentally removed in the last version.
* New floating point hasher - will hash the binary representation on more
  platforms, which should be faster.

[h2 Boost 1.53.0]

* Add support for `boost::int128_type` and `boost::uint128_type` where
  available - currently only `__int128` and `unsigned __int128` on some
  versions of gcc.
* On platforms that are known to have the standard floating point functions,
  don't use automatic detection - which can break if there are ambiguous
  overloads.
* Fix undefined behaviour when using the binary float hash (Thomas Heller).

[h2 Boost 1.54.0]

* [@https://svn.boost.org/trac/boost/ticket/7957 Ticket 7957]:
  Fixed a typo.

[h2 Boost 1.55.0]

* Simplify a SFINAE check so that it will hopefully work on Sun 5.9
  ([ticket 8822]).
* Suppress Visual C++ infinite loop warning ([ticket 8568]).

[h2 Boost 1.56.0]

* Removed some Visual C++ 6 workarounds.
* Ongoing work on improving `hash_combine`. This changes the combine function
  which was previously defined in the reference documentation.

[h2 Boost 1.58.0]

* Fixed strict aliasing violation
  ([@https://github.com/boostorg/container_hash/pull/3 GitHub #3]).

[h2 Boost 1.63.0]

* Fixed some warnings.
* Only define hash for `std::wstring` when we know we have a `wchar_t`.
  Otherwise there's a compile error as there's no overload for hashing
  the characters in wide strings ([ticket 8552]).

[h2 Boost 1.64.0]

* Fix for recent versions of Visual C++ which have removed `std::unary_function`
  and `std::binary_function` ([ticket 12353]).

[h2 Boost 1.65.0]

* Support for `char16_t`, `char32_t`, `u16string`, `u32string`

[h2 Boost 1.66.0]

* Avoid float comparison warning when using Clang - this workaround was
  already in place for GCC, and was used when Clang pretends to be GCC,
  but the warning was appearing when running Clang in other contexts.

[h2 Boost 1.67.0]

* Moved library into its own module, `container_hash`.
* Moved headers for new module name, now at:
  `<boost/container_hash/hash.hpp>`,
  `<boost/container_hash/hash_fwd.hpp>`,
  `<boost/container_hash/extensions.hpp>`.
* Added forwarding headers to support the old headers locations.
* Support `std::string_view`, `std::error_code`, `std::error_condition`
  `std::optional`, `std::variant`, `std::monostate` where available.
* Update include paths from other Boost libraries.
* Manually write out tuple overloads, rather than using the
  preprocessor to generate them. Should improve usability, due
  to better error messages, and easier debugging.
* Fix tutorial example ([ticket 11017]).
* Quick fix for hashing `vector<bool>` when using libc++. Will try to introduce
  a more general fix in the next release.

[endsect]