added useful constants to math

Author: boggle

src/libcore/f32.rs

@@ -15,6 +15,9 @@ export
     frexp, ldexp, ln, ln1p, log10, log2, modf, rint, round, pow, sin,
     sinh, sqrt, tan, tanh, trunc, t;
 
+export radix, mantissa_digits, digits, epsilon, min_value, max_value,
+       min_exp, max_exp, min_10_exp, max_10_exp;
+
 export consts;
 
 type t = f32;
@@ -114,6 +117,27 @@ mod consts {
     const ln_10: f32 = 2.30258509299404568401799145468436421f32;
 }
 
+// These are not defined inside consts:: for consistency with
+// the integer types
+
+// PORT check per architecture
+
+const radix: uint = 2u;
+
+const mantissa_digits: uint = 24u;
+const digits: uint = 6u;
+
+const epsilon: f32 = 1.19209290e-07f32;
+
+const min_value: f32 = 1.17549435e-38f32;
+const max_value: f32 = 3.40282347e+38f32;
+
+const min_exp: int = -125;
+const max_exp: int = 128;
+
+const min_10_exp: int = -37;
+const max_10_exp: int = 38;
+
 //
 // Local Variables:
 // mode: rust

src/libcore/f64.rs

@@ -15,6 +15,9 @@ export
     frexp, ldexp, ln, ln1p, log10, log2, modf, rint, round, pow, sin,
     sinh, sqrt, tan, tanh, trunc, t;
 
+export radix, mantissa_digits, digits, epsilon, min_value, max_value,
+       min_exp, max_exp, min_10_exp, max_10_exp;
+
 export consts;
 
 type t = f64;
@@ -114,6 +117,27 @@ mod consts {
     const ln_10: f64 = 2.30258509299404568401799145468436421f64;
 }
 
+// These are not defined inside consts:: for consistency with
+// the integer types
+
+// PORT check per architecture
+
+const radix: uint = 2u;
+
+const mantissa_digits: uint = 53u;
+const digits: uint = 15u;
+
+const epsilon: f64 = 2.2204460492503131e-16f64;
+
+const min_value: f64 = 2.2250738585072014e-308f64;
+const max_value: f64 = 1.7976931348623157e+308f64;
+
+const min_exp: int = -1021;
+const max_exp: int = 1024;
+
+const min_10_exp: int = -307;
+const max_10_exp: int = 308;
+
 //
 // Local Variables:
 // mode: rust

src/libcore/float.rs

@@ -719,6 +719,31 @@ Returns the integral value nearest to but no larger in magnitude than `x`
 pure fn trunc(x: float) -> float
     { ret m_float::trunc(x as m_float) as float }
 
+/*
+
+FIXME implement this as soon as const expressions may refer to each other
+
+export radix, mantissa_digits, digits, epsilon, min_value, max_value,
+       min_exp, max_exp, min_10_exp, max_10_exp;
+
+const radix: m_float = m_float::radix as m_float;
+
+const mantissa_digits: m_float = m_float::mantissa_digits as m_float;
+const digits: m_float = m_float::digits as m_float;
+
+const epsilon: m_float = m_float::epsilon as m_float;
+
+const min_value: m_float = m_float::min_value as m_float;
+const max_value: m_float = m_float::max_value as m_float;
+
+const min_exp: m_float = m_float::min_exp as m_float;
+const max_exp: m_float = m_float::max_exp as m_float;
+
+const min_10_exp: m_float = m_float::min_10_exp as m_float;
+const max_10_exp: m_float = m_float::max_10_exp as m_float;
+
+*/
+
 //
 // Local Variables:
 // mode: rust
@@ -728,3 +753,8 @@ pure fn trunc(x: float) -> float
 // buffer-file-coding-system: utf-8-unix
 // End:
 //
+
+
+
+
+