Add constexpr specifier for Coordinate constructors

Author: dxrcy

include/mcpp/util.h

@@ -23,12 +23,12 @@ struct Coordinate {
      * @param y The y-coordinate.
      * @param z The z-coordinate.
      */
-    Coordinate(int x, int y, int z) : x(x), y(y), z(z) {}
+    constexpr Coordinate(int x, int y, int z) : x(x), y(y), z(z) {}
 
     /**
      * @brief Constructs a Coordinate object with zero values.
      */
-    Coordinate() : x(0), y(0), z(0) {}
+    constexpr Coordinate() : x(0), y(0), z(0) {}
 
     /**
      * @brief Constructs a Coordinate object with double values.
@@ -37,7 +37,7 @@ struct Coordinate {
      * @param y The y-coordinate as a double.
      * @param z The z-coordinate as a double.
      */
-    Coordinate(double x, double y, double z)
+    constexpr Coordinate(double x, double y, double z)
         : x(static_cast<int>(x)), y(static_cast<int>(y)),
           z(static_cast<int>(z)) {}