Changeset 10742 for code/branches/cpp11_v2

Timestamp:

Nov 1, 2015, 2:52:04 PM (9 years ago)

Author:

landauf

Message:

use constexpr for some math functions and constants

File:

• code/branches/cpp11_v2/src/libraries/util/Math.h (modified) (5 diffs)

code/branches/cpp11_v2/src/libraries/util/Math.h

@@ -73 +73 @@
     namespace math
     {
-        const float twoPi   = 6.283185482025146484375f;     ///< PI * 2
-        const float pi      = 3.1415927410125732421875f;    ///< PI
-        const float pi_2    = 1.57079637050628662109375f;   ///< PI / 2
-        const float pi_4    = 0.785398185253143310546875f;  ///< PI / 4
-        const float e       = 2.718281269073486328125f;     ///< e
-        const float sqrt2   = 1.41421353816986083984375f;   ///< sqrt(2)
-        const float sqrt2_2 = 0.707106769084930419921875f;  ///< sqrt(2) / 2
+        constexpr float twoPi   = 6.283185482025146484375f;     ///< PI * 2
+        constexpr float pi      = 3.1415927410125732421875f;    ///< PI
+        constexpr float pi_2    = 1.57079637050628662109375f;   ///< PI / 2
+        constexpr float pi_4    = 0.785398185253143310546875f;  ///< PI / 4
+        constexpr float e       = 2.718281269073486328125f;     ///< e
+        constexpr float sqrt2   = 1.41421353816986083984375f;   ///< sqrt(2)
+        constexpr float sqrt2_2 = 0.707106769084930419921875f;  ///< sqrt(2) / 2
     }
 
@@ -104 +104 @@
     */
     template <typename T>
-    inline T sgn(T x)
+    constexpr inline T sgn(T x)
     {
         return (x >= 0) ? (T)1 : (T)-1;
@@ -116 +116 @@
     */
     template <typename T>
-    inline T clamp(T x, T min, T max)
-    {
-        if (x < min)
-            return min;
-
-        if (x > max)
-            return max;
-
-        return x;
+    constexpr inline T clamp(T x, T min, T max)
+    {
+        return x < min ? min : (x > max ? max : x);
     }
 
@@ -131 +125 @@
     */
     template <typename T>
-    inline T square(T x)
+    constexpr inline T square(T x)
     {
         return x*x;
@@ -140 +134 @@
     */
     template <typename T>
-    inline T cube(T x)
+    constexpr inline T cube(T x)
     {
         return x*x*x;