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Add a visitor for scan arguments

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This commit is contained in:
Victor Zverovich 2023-12-30 07:43:21 -08:00
parent 41d31512b7
commit 5ddd0cad15
1 changed files with 24 additions and 0 deletions
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24
test/scan.h
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@ -363,6 +363,30 @@ class scan_arg {
custom.scan = scan_custom_arg<T>;
}
template <typename Visitor>
auto visit(Visitor&& vis) -> decltype(vis(std::declval<int>())) {
switch (type) {
case scan_type::none_type:
break;
case scan_type::int_type:
return vis(int_value);
case scan_type::uint_type:
return vis(uint_value);
case scan_type::long_long_type:
return vis(long_long_value);
case scan_type::ulong_long_type:
return vis(ulong_long_value);
case scan_type::string_type:
return vis(string);
case scan_type::string_view_type:
return vis(string_view);
case scan_type::custom_type:
// TODO: implement
break;
}
return vis(monostate());
}
private:
template <typename T>
static void scan_custom_arg(void* arg, scan_parse_context& parse_ctx,