const_fmt/format.h

@@ -2,6 +2,8 @@
 #define LOGGER_FORMAT_H
 
 
+#include <cstring>
+
 #include "format_impl.h"
 #include "parse.h"
 #include "utility.h"

const_fmt/format_impl.h

@@ -96,6 +96,10 @@ constexpr inline const char* digits2_base(size_t value) {
 
 
 constexpr inline void copy2(char* dst, const char* src) {
+    if (!std::is_constant_evaluated()) {
+        std::memcpy(dst, src, 2);
+        return;
+    }
     *dst++ = static_cast<char>(*src++);
     *dst   = static_cast<char>(*src);
 }