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42 lines
1.9 KiB
Plaintext
42 lines
1.9 KiB
Plaintext
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Boost.Optional
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Copyright (c) 2015 Andrzej Krzemienski
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Distributed under the Boost Software License, Version 1.0.
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(See accompanying file LICENSE_1_0.txt or copy at
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http://www.boost.org/LICENSE_1_0.txt)
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]
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[section:relnotes Release Notes]
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[heading Boost Release 1.58]
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* `boost::none_t` is no longer convertible from literal `0`. This avoids a bug where `optional<rational<int>> oi = 0;` would initialize an optional object with no contained value.
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[heading Boost Release 1.57]
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* [@https://github.com/boostorg/optional/pull/9 Git pull #9]: ['"Supply `<string>` to fix C++03 compile error on `logic_error("...")`"].
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[heading Boost Release 1.56]
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* Added support for rvalue references. Now `optional<T>` works with moveable but non-copyable `T`'s,
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* Improved `swap` (now uses move operations),
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* Added function `emplace()`. This is the last of the requests from [@https://svn.boost.org/trac/boost/ticket/1841 Trac #1841],
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* `optional` is moveable, including conditional `noexcept` specifications, which make it `move_if_noexcept`-friendly,
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* Using explicit operator bool() on platforms that support it ([@https://svn.boost.org/trac/boost/ticket/4227 Trac #4227]) (breaking change),
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* Forward declaration of `operator<<(ostream&, optional const&)` to prevent inadvertent incorrect serialization of optional objects,
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* Removed deprecated function `reset()` from examples ([@https://svn.boost.org/trac/boost/ticket/9005 Trac #9005]),
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* Equality comparison with `boost::none` does not require that `T` be EqualityComparable,
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* Optional rvalue references are explicitly disallowed,
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* Binding temporaries to optional references is explicitly disallowed (breaking change),
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* More ways to access the contained value, functions `value()`, `value_or()`, `value_or_eval()`,
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* Updated and reorganized documentation, added tutorial and quick guide sections.
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[endsect][/ relnotes]
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