compat/macros: fix eval_once

Using with `qDebug()' didn't work. Remove return type.

1 files changed, 5 insertions, 8 deletions

diff --git a/compat/macros.hpp b/compat/macros.hpp
index deb9c9bf..89e095dd 100644
--- a/compat/macros.hpp
+++ b/compat/macros.hpp
@@ -27,17 +27,14 @@ using to_const_cvref_t = std::add_lvalue_reference_t<std::add_const_t<remove_cvr
 // the ICE is caused by decltype(auto) and const& return value
 //#define eval_once(expr) ([&]() -> decltype(auto) { static decltype(auto) ret___1132 = (expr); return (decltype(ret___1132) const&) ret___1132; }())
 
-#define eval_once(expr) eval_once__2(expr, PP_CAT(_EVAL_ONCE__, __COUNTER__))
-#define eval_once__2(expr, ident) eval_once__3(expr, ident)
+#define eval_once(expr) eval_once2(expr, __COUNTER__)
 
-#define eval_once__3(expr, ident)                                                               \
-    ([&]() -> decltype(auto) {                                                                  \
-        static auto INIT##ident = (expr);                                                       \
-        return static_cast<to_const_cvref_t<decltype(INIT##ident)>>(INIT##ident);    \
+#define eval_once2(expr, ctr)                                       \
+    ([&] {                                                          \
+        [[maybe_unused]]                                            \
+        static auto PP_CAT(eval_once_, ctr) = (((void)(expr)), 0);  \
     }())
 
-#include <type_traits>
-
 template<typename t>
 using cv_qualified = std::conditional_t<std::is_fundamental_v<remove_cvref_t<t>>,
                                         remove_cvref_t<t>,