refactor: continue refactor project from C++17 to 23

src/yycc/macro/endian_detector.hpp

@@ -5,3 +5,24 @@
 #error "Current system endian (byte order) is not supported!"
 #endif
 
+namespace yycc::macro::endian {
+
+    /// @brief The endian kind of OS.
+    enum class EndianKind {
+        Little, ///< Little endian.
+        Big,    ///< Big endian.
+    };
+
+    /**
+     * @brief Fetch the endian of OS.
+     * @return The endian of OS.
+     */
+    inline constexpr EndianKind get_endian() {
+#if defined(YYCC_ENDIAN_LITTLE)
+        return EndianKind::Little;
+#else
+        return EndianKind::Big;
+#endif
+    }
+
+} // namespace yycc::macro::endian