include/denc: rewrite is_any_of using concept

just for better readability

Signed-off-by: Kefu Chai <tchaikov@gmail.com>

diff --git a/src/include/denc.h b/src/include/denc.h
index b8982fa2110da509a0c69f39b357a3a723d1eefc..a5dd60413b283601c94cebf64a51898ac4b1afd9 100644 (file)
--- a/src/include/denc.h
+++ b/src/include/denc.h
@@ -269,8 +269,8 @@ template<typename T> int DencDumper<T>::i = 0;
 // ---------------------------------------------------------------------
 // raw types
 namespace _denc {
-template<typename T, typename... Us>
-inline constexpr bool is_any_of = (... || std::is_same_v<T, Us>);
+template<typename T, typename... U>
+concept is_any_of = (std::same_as<T, U> || ...);
 
 template<typename T, typename=void> struct underlying_type {
   using type = T;