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glywk
2022-03-07 13:55:57 +01:00
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doc/17_gotchas.qbk
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@ -61,12 +61,12 @@ When an optional object that contains a value is moved from (is a source of move
assert (opi);
assert (*opi == nullptr);
Quite a lot of people expect that when an object that contains a value is moved from, its contained value should be destroyed. This is not so, for performance reasons. Current semantics allow the implementation of `boost::opiotnal<T>` to be trivially copyable when `T` is trivial.
Quite a lot of people expect that when an object that contains a value is moved from, its contained value should be destroyed. This is not so, for performance reasons. Current semantics allow the implementation of `boost::optional<T>` to be trivially copyable when `T` is trivial.
[endsect]
[section Mixed relational comparisons]
Because `T` is convertible to `optional<T>` and because `opiotnal<T>` is __SGI_LESS_THAN_COMPARABLE__ when `T` is __SGI_LESS_THAN_COMPARABLE__,
Because `T` is convertible to `optional<T>` and because `optional<T>` is __SGI_LESS_THAN_COMPARABLE__ when `T` is __SGI_LESS_THAN_COMPARABLE__,
you can sometimes get an unexpected runtime result where you would rather expect a compiler error:
optional<double> Flight_plan::weight(); // sometimes no weight can be returned
@ -108,4 +108,4 @@ This is obviously redundant, but makes the warning disappear.
[endsect]
[endsect]
[endsect]