Created
December 15, 2022 19:44
-
-
Save tamaskenez/df15d148fd8b507167d9cfa644636561 to your computer and use it in GitHub Desktop.
Define switch_variant, helper for switch on variants.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
/* Use switch_variant like this: | |
switch_variant(someVariant, | |
[](AlternativeWithoutData) { ... }, | |
[](const AlternativeWithData& x) { ... }, | |
... | |
[](auto) {} // default branch | |
}; | |
*/ | |
template <typename... Ts> | |
struct overloaded : Ts... { | |
using Ts::operator()...; | |
}; | |
template <typename... Ts> | |
overloaded(Ts...) -> overloaded<Ts...>; | |
template <typename... Ts, typename Variant> | |
auto switch_variant(Variant&& variant, Ts&&... ts) { | |
return std::visit(overloaded{std::forward<Ts>(ts)...}, std::forward<Variant>(variant)); | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment