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Document uses_double_storage(). Refs #37.

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Peter Dimov
2023-06-29 18:32:58 +03:00
parent 362224a009
commit e2546b70ca
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4
doc/variant2/changelog.adoc
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@ -8,6 +8,10 @@ https://www.boost.org/LICENSE_1_0.txt
# Revision History # Revision History
:idprefix: changelog_ :idprefix: changelog_
## Changes in 1.83.0
* Added `uses_double_storage()`.
## Changes in 1.81.0 ## Changes in 1.81.0
* Added support for `boost::json::value_from` and `boost::json::value_to`. * Added support for `boost::json::value_from` and `boost::json::value_to`.

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doc/variant2/reference.adoc
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@ -250,6 +250,8 @@ public:
constexpr bool valueless_by_exception() const noexcept; constexpr bool valueless_by_exception() const noexcept;
constexpr size_t index() const noexcept; constexpr size_t index() const noexcept;
static constexpr bool uses_double_storage() noexcept;
// swap // swap
void swap( variant& r ) noexcept( /*see below*/ ); void swap( variant& r ) noexcept( /*see below*/ );
@ -570,6 +572,18 @@ constexpr size_t index() const noexcept;
Returns: :: Returns: ::
The zero-based index of the active alternative. The zero-based index of the active alternative.
```
static constexpr bool uses_double_storage() noexcept;
```
[none]
* {blank}
+
Returns: ::
`true` if the variant uses double storage to meet the never valueless
guarantee because one of the alternatives is not nothrow move constructible,
and `false` otherwise.
#### Swap #### Swap
``` ```