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githole · Aug 22, 2016 · bdbd778 · bdbd778
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diff --git a/blueNoise/hlib/constant.h b/blueNoise/hlib/constant.h
@@ -0,0 +1,30 @@
+#ifndef _CONSTANT_H_
+#define _CONSTANT_H_
+
+#include <limits>
+
+namespace hstd {
+
+
+template<typename T>
+inline T PI() {
+	return 3.1415926535897931;
+};
+
+template<>
+inline float PI() {
+	return 3.1415927f;
+};
+
+template<>
+inline double PI() {
+	return 3.1415926535897931;
+};
+
+static const float kPI = PI<float>();
+
+static const float kINF = std::numeric_limits<float>::infinity();
+
+} // namespace hstd
+
+#endif // _CONSTANT_H_