diff --git a/SDL2pp/Rect.cc b/SDL2pp/Rect.cc
index 2b65068..9035753 100644
--- a/SDL2pp/Rect.cc
+++ b/SDL2pp/Rect.cc
@@ -27,38 +27,6 @@
 
 namespace SDL2pp {
 
-Rect Rect::FromCenter(int cx, int cy, int w, int h) {
-	return Rect(cx - w/2, cy - h/2, w, h);
-}
-
-Rect Rect::FromCenter(const Point& center, const Point& size) {
-	return Rect(center - size / 2, size);
-}
-
-Rect Rect::FromCorners(int x1, int y1, int x2, int y2) {
-	return Rect(x1, y1, x2 - x1 + 1, y2 - y1 + 1);
-}
-
-Rect Rect::FromCorners(const Point& p1, const Point& p2) {
-	return Rect(p1, p2 - p1 + Point(1, 1));
-}
-
-bool Rect::Contains(int px, int py) const {
-	return px >= x && py >= y && px <= GetX2() && py <= GetY2();
-}
-
-bool Rect::Contains(const Point& point) const {
-	return point.x >= x && point.y >= y && point.x <= GetX2() && point.y <= GetY2();
-}
-
-bool Rect::Contains(const Rect& rect) const {
-	return rect.x >= x && rect.y >= y && rect.GetX2() <= GetX2() && rect.GetY2() <= GetY2();
-}
-
-bool Rect::Intersects(const Rect& rect) const {
-	return !(rect.GetX2() < x || rect.GetY2() < y || rect.x > GetX2() || rect.y > GetY2());
-}
-
 Rect Rect::GetUnion(const Rect& rect) const {
 	return Rect::FromCorners(
 			std::min(x, rect.x),
@@ -114,20 +82,6 @@ bool Rect::IntersectLine(Point& p1, Point& p2) const {
 	return SDL_IntersectRectAndLine(this, &p1.x, &p1.y, &p2.x, &p2.y) == SDL_TRUE;
 }
 
-Rect& Rect::operator+=(const Point& offset) {
-	x += offset.x;
-	y += offset.y;
-
-	return *this;
-}
-
-Rect& Rect::operator-=(const Point& offset) {
-	x -= offset.x;
-	y -= offset.y;
-
-	return *this;
-}
-
 }
 
 std::ostream& operator<<(std::ostream& stream, const SDL2pp::Rect& rect) {
diff --git a/SDL2pp/Rect.hh b/SDL2pp/Rect.hh
index dbb676d..64d7c7d 100644
--- a/SDL2pp/Rect.hh
+++ b/SDL2pp/Rect.hh
@@ -95,7 +95,9 @@ public:
 	/// \param[in] h Height of the rectangle
 	///
 	////////////////////////////////////////////////////////////
-	static Rect FromCenter(int cx, int cy, int w, int h);
+	static Rect FromCenter(int cx, int cy, int w, int h) {
+		return Rect(cx - w/2, cy - h/2, w, h);
+	}
 
 	////////////////////////////////////////////////////////////
 	/// \brief Construct the rect from given center coordinates and size
@@ -104,7 +106,9 @@ public:
 	/// \param[in] size Dimensions of the rectangle
 	///
 	////////////////////////////////////////////////////////////
-	static Rect FromCenter(const Point& center, const Point& size);
+	static Rect FromCenter(const Point& center, const Point& size) {
+		return Rect(center - size / 2, size);
+	}
 
 	////////////////////////////////////////////////////////////
 	/// \brief Construct the rect from given corners coordinates
@@ -115,7 +119,9 @@ public:
 	/// \param[in] y2 Y coordinate of the bottom right rectangle corner
 	///
 	////////////////////////////////////////////////////////////
-	static Rect FromCorners(int x1, int y1, int x2, int y2);
+	static Rect FromCorners(int x1, int y1, int x2, int y2) {
+		return Rect(x1, y1, x2 - x1 + 1, y2 - y1 + 1);
+	}
 
 	////////////////////////////////////////////////////////////
 	/// \brief Construct the rect from given centers coordinates
@@ -124,7 +130,9 @@ public:
 	/// \param[in] p2 Coordinates of the bottom right rectangle corner
 	///
 	////////////////////////////////////////////////////////////
-	static Rect FromCorners(const Point& p1, const Point& p2);
+	static Rect FromCorners(const Point& p1, const Point& p2) {
+		return Rect(p1, p2 - p1 + Point(1, 1));
+	}
 
 	////////////////////////////////////////////////////////////
 	/// \brief Copy constructor
@@ -331,7 +339,9 @@ public:
 	/// \returns True if the point is contained in the rect
 	///
 	////////////////////////////////////////////////////////////
-	bool Contains(int x, int y) const;
+	constexpr bool Contains(int px, int py) const {
+		return px >= x && py >= y && px <= GetX2() && py <= GetY2();
+	}
 
 	////////////////////////////////////////////////////////////
 	/// \brief Check whether the rect contains given point
@@ -341,7 +351,9 @@ public:
 	/// \returns True if the point is contained in the rect
 	///
 	////////////////////////////////////////////////////////////
-	bool Contains(const Point& point) const;
+	constexpr bool Contains(const Point& point) const {
+		return point.x >= x && point.y >= y && point.x <= GetX2() && point.y <= GetY2();
+	}
 
 	////////////////////////////////////////////////////////////
 	/// \brief Check whether the rect contains another rect
@@ -351,7 +363,9 @@ public:
 	/// \returns True if the checked rect is contained in this rect
 	///
 	////////////////////////////////////////////////////////////
-	bool Contains(const Rect& rect) const;
+	constexpr bool Contains(const Rect& rect) const {
+		return rect.x >= x && rect.y >= y && rect.GetX2() <= GetX2() && rect.GetY2() <= GetY2();
+	}
 
 	////////////////////////////////////////////////////////////
 	/// \brief Check whether the rect intersects another rect
@@ -361,7 +375,9 @@ public:
 	/// \returns True if rectangles intersect
 	///
 	////////////////////////////////////////////////////////////
-	bool Intersects(const Rect& rect) const;
+	constexpr bool Intersects(const Rect& rect) const {
+		return !(rect.GetX2() < x || rect.GetY2() < y || rect.x > GetX2() || rect.y > GetY2());
+	}
 
 	////////////////////////////////////////////////////////////
 	/// \brief Calculate union with another rect
@@ -484,7 +500,11 @@ public:
 	/// \returns Reference to self
 	///
 	////////////////////////////////////////////////////////////
-	Rect& operator+=(const Point& offset);
+	Rect& operator+=(const Point& offset) {
+		x += offset.x;
+		y += offset.y;
+		return *this;
+	}
 
 	////////////////////////////////////////////////////////////
 	/// \brief Move by an opposite of the given offset
@@ -494,7 +514,11 @@ public:
 	/// \returns Reference to self
 	///
 	////////////////////////////////////////////////////////////
-	Rect& operator-=(const Point& offset);
+	Rect& operator-=(const Point& offset) {
+		x -= offset.x;
+		y -= offset.y;
+		return *this;
+	}
 };
 
 }
diff --git a/tests/test_pointrect_constexpr.cc b/tests/test_pointrect_constexpr.cc
index 0b6d02d..d360555 100644
--- a/tests/test_pointrect_constexpr.cc
+++ b/tests/test_pointrect_constexpr.cc
@@ -71,5 +71,12 @@ BEGIN_TEST()
 		constexpr Rect sub = r1 - Point(1, 1);
 
 		EXPECT_EQUAL(add - Point(2, 2), sub);
+
+		constexpr bool b3 = r2.Contains(0, 0);
+		constexpr bool b4 = r2.Contains(Point(0, 0));
+		constexpr bool b5 = r2.Contains(Rect(0, 0, 1, 1));
+		constexpr bool b6 = r2.Intersects(Rect(0, 0, 1, 1));
+
+		EXPECT_TRUE(b3 && b4 && b5 && b6);
 	}
 END_TEST()