1 files changed, 3 insertions, 3 deletions
diff --git a/funreg.hpp b/funreg.hpp
index 9dc5449..db0bb37 100644
--- a/funreg.hpp
+++ b/funreg.hpp
@@ -192,9 +192,9 @@ struct Register {
     // bit-mask created by merging all provided bit-masks.
     // If no masks are given, a mask selecting all bits is used.
     template<typename... Masks>
-    static void apply(auto fn) {
+    static constexpr void apply(auto fn) {
         if constexpr (sizeof...(Masks) > 0) {
-            auto mask = mergeMasks<Masks...>();
+            constexpr auto mask = mergeMasks<Masks...>();
             if constexpr (mask)
                 write(fn(read(), mask));
         } else {
@@ -205,7 +205,7 @@ struct Register {
     // Takes a list of bit-masks, and returns a merged mask of those which are
     // meant for this register.
     template<typename... Masks>
-    static auto mergeMasks() {
+    static constexpr auto mergeMasks() {
         if constexpr (sizeof...(Masks) > 0) {
             if constexpr ((isThis<typename Masks::reg> | ...)) {
                 auto mask =