made const operators

UGameEngine/utils/vector3d.cpp

     return sqrt((_x * _x) + (_y * _y) + (_z * _z));
 }
 
-Vector3D Vector3D::operator+()
+Vector3D Vector3D::operator+() const
 {
     return *this;
 }
 
-Vector3D Vector3D::operator+(const double &k)
+Vector3D Vector3D::operator+(const double &k) const
 {
     return Vector3D(*this).add(k);
 }
     return add(k);
 }
 
-Vector3D Vector3D::operator+(const Vector3D &other)
+Vector3D Vector3D::operator+(const Vector3D &other) const
 {
     return Vector3D(*this).add(other);
 }
     return add(other);
 }
 
-Vector3D Vector3D::operator-()
+Vector3D Vector3D::operator-() const
 {
     return Vector3D(-_x, -_y, -_z);
 }
 
-Vector3D Vector3D::operator-(const double &k)
+Vector3D Vector3D::operator-(const double &k) const
 {
     return Vector3D(*this).sub(k);
 }
     return sub(k);
 }
 
-Vector3D Vector3D::operator-(const Vector3D &other)
+Vector3D Vector3D::operator-(const Vector3D &other) const
 {
     return Vector3D(*this).sub(other);
 }
     return sub(other);
 }
 
-Vector3D Vector3D::operator*(const double &k)
+Vector3D Vector3D::operator*(const double &k) const
 {
     return Vector3D(*this).mult(k);
 }
     return mult(k);
 }
 
-double Vector3D::operator*(const Vector3D &other)
+double Vector3D::operator*(const Vector3D &other) const
 {
     return Vector3D(*this).dotProduct(other);
 }
     return *this;
 }
 
-Vector3D Vector3D::operator/(const double &k)
+Vector3D Vector3D::operator/(const double &k) const
 {
     return Vector3D(*this).div(k);
 }
     return div(k);
 }
 
-bool Vector3D::operator==(const Vector3D &other)
+bool Vector3D::operator==(const Vector3D &other) const
 {
     return equal(other);
 }
 
-bool Vector3D::operator!=(const Vector3D &other)
+bool Vector3D::operator!=(const Vector3D &other) const
 {
     return !equal(other);
 }
 
-bool Vector3D::operator!()
+bool Vector3D::operator!() const
 {
     return isNull();
 }
 
-Vector3D::operator bool()
+Vector3D::operator bool() const
 {
     return !isNull();
 }

UGameEngine/utils/vector3d.h

 
     double norm() const;
 
-    Vector3D operator+();
-    Vector3D operator+(const double& k);
+    Vector3D operator+() const;
+    Vector3D operator+(const double& k) const;
     Vector3D& operator+=(const double& k);
-    Vector3D operator+(const Vector3D& other);
+    Vector3D operator+(const Vector3D& other) const;
     Vector3D& operator+=(const Vector3D& other);
 
-    Vector3D operator-();
-    Vector3D operator-(const double& k);
+    Vector3D operator-() const;
+    Vector3D operator-(const double& k) const;
     Vector3D& operator-=(const double& k);
-    Vector3D operator-(const Vector3D& other);
+    Vector3D operator-(const Vector3D& other) const;
     Vector3D& operator-=(const Vector3D& other);
 
-    Vector3D operator*(const double& k);
+    Vector3D operator*(const double& k) const;
     Vector3D& operator*=(const double& k);
-    double operator*(const Vector3D& other);
+    double operator*(const Vector3D& other) const;
     Vector3D& operator*=(const Vector3D& other);
 
-    Vector3D operator/(const double& k);
+    Vector3D operator/(const double& k) const;
     Vector3D& operator/=(const double& k);
 
-    bool operator==(const Vector3D& other);
-    bool operator!=(const Vector3D& other);
+    bool operator==(const Vector3D& other) const;
+    bool operator!=(const Vector3D& other) const;
 
-    bool operator!();
-    operator bool();
+    bool operator!() const;
+    operator bool() const;
 
 private:
     double _x;