From 925cc3d2ffade5709e2173d69131d298b6b5c2c8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Vladim=C3=ADr=20Vondru=C5=A1?= <mosra@centrum.cz>
Date: Fri, 27 Apr 2012 02:28:32 +0200
Subject: [PATCH] Make Math::pow() templated on type.

---
 src/Math/Math.h            | 19 +++++++++++++------
 src/Math/Test/MathTest.cpp |  5 +++--
 2 files changed, 16 insertions(+), 8 deletions(-)

diff --git a/src/Math/Math.h b/src/Math/Math.h
index 827ba6c81..f651a812e 100644
--- a/src/Math/Math.h
+++ b/src/Math/Math.h
@@ -52,6 +52,17 @@ template<> struct Constants<float> {
     static constexpr float Sqrt2 = 1.41421356237f;
     static constexpr float Sqrt3 = 1.73205080757f;
 };
+
+namespace Implementation {
+    template<size_t exponent> struct Pow {
+        template<class T> inline constexpr T operator()(T base) const {
+            return base*Pow<exponent-1>()(base);
+        }
+    };
+    template<> struct Pow<0> {
+        template<class T> inline constexpr T operator()(T base) const { return 1; }
+    };
+}
 #endif
 
 /**
@@ -59,14 +70,10 @@ template<> struct Constants<float> {
  *
  * Returns integral power of base to the exponent.
  */
-template<size_t exponent> inline constexpr size_t pow(size_t base) {
-    return base*pow<exponent-1>(base);
+template<size_t exponent, class T> inline constexpr T pow(T base) {
+    return Implementation::Pow<exponent>()(base);
 }
 
-#ifndef DOXYGEN_GENERATING_OUTPUT
-template<> inline constexpr size_t pow<0>(size_t base) { return 1; }
-#endif
-
 /**
  * @brief Integral logarithm
  *
diff --git a/src/Math/Test/MathTest.cpp b/src/Math/Test/MathTest.cpp
index 63080e8a3..eb823548c 100644
--- a/src/Math/Test/MathTest.cpp
+++ b/src/Math/Test/MathTest.cpp
@@ -30,8 +30,9 @@ void MathTest::degrad() {
 }
 
 void MathTest::pow() {
-    QCOMPARE(Math::pow<10>(2), 1024ul);
-    QCOMPARE(Math::pow<0>(3), 1ul);
+    QCOMPARE(Math::pow<10>(2ul), 1024ul);
+    QCOMPARE(Math::pow<0>(3ul), 1ul);
+    QCOMPARE(Math::pow<2>(2.0f), 4.0f);
 }
 
 void MathTest::log() {