Add as() functions to std::optional

filipsajdak · filipsajdak · commit bc800ade0530 · 2022-11-04T22:48:13.000+01:00
diff --git a/include/cpp2util.h b/include/cpp2util.h
@@ -675,6 +675,14 @@ auto optional_as(T&& t) -> auto {
     }
 }
 
+template< typename O, typename T >
+auto as(T&& t) -> auto
+    requires (is<std::optional>(O{}))
+{
+    using C = typename O::value_type;
+    return cpp2::optional_as<C>(std::forward<T>(t));
+}
+
 //-------------------------------------------------------------------------------------------------------------
 //  std::variant is and as
 //

Original file line number	Diff line number	Diff line change
`@@ -675,6 +675,14 @@ auto optional_as(T&& t) -> auto {`
`675`	`675`	`}`
`676`	`676`	`}`
`677`	`677`
	`678`	`+template< typename O, typename T >`
	`679`	`+auto as(T&& t) -> auto`
	`680`	`+ requires (is<std::optional>(O{}))`
	`681`	`+{`
	`682`	`+ using C = typename O::value_type;`
	`683`	`+ return cpp2::optional_as<C>(std::forward<T>(t));`
	`684`	`+}`
	`685`	`+`
`678`	`686`	`//-------------------------------------------------------------------------------------------------------------`
`679`	`687`	`// std::variant is and as`
`680`	`688`	`//`