Follow-up on issue #13297 and PR #13710. Instead of following the (confusing) C/C++ approach
of using `MIN_VALUE` for the smallest *positive* number, we introduce `MIN_POS_VALUE` (and
in the Float trait, `min_pos_value`) to represent this number.
This patch also removes a few remaining redundantly-defined constants that were missed last
time around.
pub static EPSILON: f32 = 1.19209290e-07_f32;
-/// Minimum normalized f32 value
-pub static MIN_VALUE: f32 = 1.17549435e-38_f32;
-/// Maximum f32 value
+/// Smallest finite f32 value
+pub static MIN_VALUE: f32 = -3.40282347e+38_f32;
+/// Smallest positive, normalized f32 value
+pub static MIN_POS_VALUE: f32 = 1.17549435e-38_f32;
+/// Largest finite f32 value
pub static MAX_VALUE: f32 = 3.40282347e+38_f32;
pub static MIN_EXP: int = -125;
pub mod consts {
// FIXME: replace with mathematical constants from cmath.
- // FIXME(#11621): These constants should be deprecated once CTFE is
- // implemented in favour of calling their respective functions in `Float`.
+ // FIXME(#5527): These constants should be deprecated once associated
+ // constants are implemented in favour of referencing the respective members
+ // of `Float`.
/// Archimedes' constant
pub static PI: f32 = 3.14159265358979323846264338327950288_f32;
#[inline]
fn max_10_exp(_: Option<f32>) -> int { MAX_10_EXP }
+ #[inline]
+ fn min_pos_value(_: Option<f32>) -> f32 { MIN_POS_VALUE }
+
/// Constructs a floating point number by multiplying `x` by 2 raised to the
/// power of `exp`
#[inline]
}
}
-// FIXME(#11621): These constants should be deprecated once CTFE is implemented
-// in favour of calling their respective functions in `Bounded` and `Float`.
+// FIXME(#5527): These constants should be deprecated once associated
+// constants are implemented in favour of referencing the respective
+// members of `Bounded` and `Float`.
pub static RADIX: uint = 2u;
pub static EPSILON: f64 = 2.2204460492503131e-16_f64;
-/// Minimum normalized f64 value
-pub static MIN_VALUE: f64 = 2.2250738585072014e-308_f64;
-/// Maximum f64 value
+/// Smallest finite f64 value
+pub static MIN_VALUE: f64 = -1.7976931348623157e+308_f64;
+/// Smallest positive, normalized f64 value
+pub static MIN_POS_VALUE: f64 = 2.2250738585072014e-308_f64;
+/// Largest finite f64 value
pub static MAX_VALUE: f64 = 1.7976931348623157e+308_f64;
pub static MIN_EXP: int = -1021;
pub mod consts {
// FIXME: replace with mathematical constants from cmath.
- // FIXME(#11621): These constants should be deprecated once CTFE is
- // implemented in favour of calling their respective functions in `Float`.
+ // FIXME(#5527): These constants should be deprecated once associated
+ // constants are implemented in favour of referencing the respective members
+ // of `Float`.
/// Archimedes' constant
pub static PI: f64 = 3.14159265358979323846264338327950288_f64;
}
#[inline]
- fn mantissa_digits(_: Option<f64>) -> uint { 53 }
+ fn mantissa_digits(_: Option<f64>) -> uint { MANTISSA_DIGITS }
#[inline]
- fn digits(_: Option<f64>) -> uint { 15 }
+ fn digits(_: Option<f64>) -> uint { DIGITS }
#[inline]
- fn epsilon() -> f64 { 2.2204460492503131e-16 }
+ fn epsilon() -> f64 { EPSILON }
#[inline]
- fn min_exp(_: Option<f64>) -> int { -1021 }
+ fn min_exp(_: Option<f64>) -> int { MIN_EXP }
#[inline]
- fn max_exp(_: Option<f64>) -> int { 1024 }
+ fn max_exp(_: Option<f64>) -> int { MAX_EXP }
#[inline]
- fn min_10_exp(_: Option<f64>) -> int { -307 }
+ fn min_10_exp(_: Option<f64>) -> int { MIN_10_EXP }
#[inline]
- fn max_10_exp(_: Option<f64>) -> int { 308 }
+ fn max_10_exp(_: Option<f64>) -> int { MAX_10_EXP }
+
+ #[inline]
+ fn min_pos_value(_: Option<f64>) -> f64 { MIN_POS_VALUE }
/// Constructs a floating point number by multiplying `x` by 2 raised to the
/// power of `exp`
/// Numbers which have upper and lower bounds
pub trait Bounded {
// FIXME (#5527): These should be associated constants
+ /// returns the smallest finite number this type can represent
fn min_value() -> Self;
+ /// returns the largest finite number this type can represent
fn max_value() -> Self;
}
/// Returns the category that this number falls into.
fn classify(self) -> FPCategory;
+ // FIXME (#5527): These should be associated constants
+
/// Returns the number of binary digits of mantissa that this type supports.
fn mantissa_digits(unused_self: Option<Self>) -> uint;
/// Returns the number of base-10 digits of precision that this type supports.
fn min_10_exp(unused_self: Option<Self>) -> int;
/// Returns the maximum base-10 exponent that this type can represent.
fn max_10_exp(unused_self: Option<Self>) -> int;
+ /// Returns the smallest normalized positive number that this type can represent.
+ fn min_pos_value(unused_self: Option<Self>) -> Self;
/// Constructs a floating point number created by multiplying `x` by 2
/// raised to the power of `exp`.
/// legs of length `x` and `y`.
fn hypot(self, other: Self) -> Self;
+ // FIXME (#5527): These should be associated constants
+
/// Archimedes' constant.
fn pi() -> Self;
/// 2.0 * pi.