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Peter Dimov
2024-02-01 03:24:33 +02:00
parent c7a0ce3349
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doc/system/reference.adoc
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@ -2804,6 +2804,22 @@ result<JsonValue const&> at_path( JsonValue const& jv,
} }
``` ```
```
template<class E, class F, class R = ...>
result<void, E>& operator&=( result<void, E>& r, F&& f );
```
[none]
* {blank}
+
If `r` contains a value, replaces `r` with the result of invoking the function `f`.
+
Let `R` be the type of `f()`.
+
Effects: :: If `r.has_value()` is `true`, assigns `f()` to `r`.
Returns: :: `r`.
Remarks: ::
Only enabled when `R` is an instance of `result<void, E2>` and `E2` is convertible to `E`.
## <boost/system.hpp> ## <boost/system.hpp>
This convenience header includes all the headers previously described. This convenience header includes all the headers previously described.