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docs: fixed release notes

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Andrzej Krzemienski
2026-02-07 23:05:25 +01:00
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@@ -11,16 +11,7 @@
[section:relnotes Release Notes]
[heading Boost Release 1.91]
* All non-mutating and some mutating functions become `constexpr` in C++14 compilers.
This addresses [@https://github.com/boostorg/optional/issues/143 issue #143].
* For C++14 applied a couple of small changes to get closer to the interface of `std::optional`:
* Enabled syntax `o = {}` for putting optional objects to no-value state.
* Enabled syntax `o.value_or({})`, which uses a default-constructed `T`.
* Construct `o = u`, where `o` is of type `optional<T>` and `u` is of type `U` convertible to `T`, does not create a temporary `T`.
* *Breaking change.* For C++14 compilers abandoned the mechanism for customizing
`swap`. Hardly anyone knows about this mechanism and it was never documented.