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diff --git a/src/cml/constants.h b/src/cml/constants.h
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+++ b/src/cml/constants.h
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+/* -*- C++ -*- ------------------------------------------------------------
+ 
+Copyright (c) 2007 Jesse Anders and Demian Nave http://cmldev.net/
+
+The Configurable Math Library (CML) is distributed under the terms of the
+Boost Software License, v1.0 (see cml/LICENSE for details).
+
+ *-----------------------------------------------------------------------*/
+/** @file
+ *  @brief Useful constants.
+ */
+
+#ifndef cml_constants_h
+#define cml_constants_h
+
+#include <cmath>
+
+#if !defined(M_PI)
+#define M_PI 3.14159265358979323846264338327950288
+#endif
+
+#if !defined(M_SQRT2)
+#define M_SQRT2 1.41421356237309504880168872420969808
+#endif
+
+#if !defined(M_E)
+#define M_E 2.71828182845904523536028747135266250
+#endif
+
+namespace cml {
+
+#if 1
+
+/** Templated constants struct.
+ *
+ * Either float or double can be used.
+ */
+template<typename Float>
+struct constants {
+    static Float pi()           { return M_PI;                             }
+    static Float two_pi()       { return 2.*M_PI;                          }
+    static Float inv_pi()       { return 1./M_PI;                          }
+    static Float inv_two_pi()   { return 1./(2.*M_PI);                     }
+    static Float pi_over_2()    { return M_PI/2.;                          }
+    static Float pi_over_4()    { return M_PI/4.;                          }
+    static Float deg_per_rad()  { return 180./M_PI;                        }
+    static Float rad_per_deg()  { return M_PI/180.;                        }
+    static Float sqrt_2()       { return M_SQRT2;                          }
+    static Float sqrt_3()       { return 1.732050807568877293527446341505; }
+    static Float sqrt_5()       { return 2.236067977499789696409173668731; }
+    static Float sqrt_6()       { return 2.449489742783178098197284074705; }
+    static Float e()            { return M_E;                              }
+};
+
+#else
+
+/* XXX This version requires an explicit instantiation of *every* constant
+ * below, e.g.:
+ *
+ * template<typename F> const F cml::constants<F>::pi;
+ */
+/** Templated constants struct.
+ *
+ * Either float or double can be used.
+ */
+template<typename Float>
+struct constants {
+    static const Float pi = M_PI;
+    static const Float two_pi = 2.*M_PI;
+    static const Float inv_pi = 1./M_PI;                /* 1/pi */
+    static const Float inv_two_pi = 1./(2.*M_PI);       /* 1/(2*pi) */
+    static const Float pi_over_2 = M_PI/2.;             /* pi/2 */
+    static const Float pi_over_4 = M_PI/4.;             /* pi/4 */
+    static const Float deg_per_rad = 180./M_PI;
+    static const Float rad_per_deg = M_PI/180.;
+    static const Float sqrt_2 = M_SQRT2;
+    static const Float sqrt_3 = 1.73205080756887729352744634150587237;
+    static const Float sqrt_5 = 2.23606797749978969640917366873127624;
+    static const Float sqrt_6 = 2.44948974278317809819728407470589139;
+    static const Float e = M_E;
+};
+
+#endif
+
+} // namespace cml
+
+#endif