1 // Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 //! Operations and constants for 64-bits floats (`f64` type)
16 use num::{Zero, One, Bounded, Signed, Num, Primitive};
17 use ops::{Add, Sub, Mul, Div, Rem, Neg};
19 // FIXME(#5527): These constants should be deprecated once associated
20 // constants are implemented in favour of referencing the respective
21 // members of `Bounded` and `Float`.
23 pub static RADIX: uint = 2u;
25 pub static MANTISSA_DIGITS: uint = 53u;
26 pub static DIGITS: uint = 15u;
28 pub static EPSILON: f64 = 2.2204460492503131e-16_f64;
30 /// Smallest finite f64 value
31 pub static MIN_VALUE: f64 = -1.7976931348623157e+308_f64;
32 /// Smallest positive, normalized f64 value
33 pub static MIN_POS_VALUE: f64 = 2.2250738585072014e-308_f64;
34 /// Largest finite f64 value
35 pub static MAX_VALUE: f64 = 1.7976931348623157e+308_f64;
37 pub static MIN_EXP: int = -1021;
38 pub static MAX_EXP: int = 1024;
40 pub static MIN_10_EXP: int = -307;
41 pub static MAX_10_EXP: int = 308;
43 pub static NAN: f64 = 0.0_f64/0.0_f64;
45 pub static INFINITY: f64 = 1.0_f64/0.0_f64;
47 pub static NEG_INFINITY: f64 = -1.0_f64/0.0_f64;
49 /// Various useful constants.
51 // FIXME: replace with mathematical constants from cmath.
53 // FIXME(#5527): These constants should be deprecated once associated
54 // constants are implemented in favour of referencing the respective members
57 /// Archimedes' constant
58 pub static PI: f64 = 3.14159265358979323846264338327950288_f64;
61 pub static PI_2: f64 = 6.28318530717958647692528676655900576_f64;
64 pub static FRAC_PI_2: f64 = 1.57079632679489661923132169163975144_f64;
67 pub static FRAC_PI_3: f64 = 1.04719755119659774615421446109316763_f64;
70 pub static FRAC_PI_4: f64 = 0.785398163397448309615660845819875721_f64;
73 pub static FRAC_PI_6: f64 = 0.52359877559829887307710723054658381_f64;
76 pub static FRAC_PI_8: f64 = 0.39269908169872415480783042290993786_f64;
79 pub static FRAC_1_PI: f64 = 0.318309886183790671537767526745028724_f64;
82 pub static FRAC_2_PI: f64 = 0.636619772367581343075535053490057448_f64;
85 pub static FRAC_2_SQRTPI: f64 = 1.12837916709551257389615890312154517_f64;
88 pub static SQRT2: f64 = 1.41421356237309504880168872420969808_f64;
91 pub static FRAC_1_SQRT2: f64 = 0.707106781186547524400844362104849039_f64;
94 pub static E: f64 = 2.71828182845904523536028747135266250_f64;
97 pub static LOG2_E: f64 = 1.44269504088896340735992468100189214_f64;
100 pub static LOG10_E: f64 = 0.434294481903251827651128918916605082_f64;
103 pub static LN_2: f64 = 0.693147180559945309417232121458176568_f64;
106 pub static LN_10: f64 = 2.30258509299404568401799145468436421_f64;
111 fn lt(&self, other: &f64) -> bool { (*self) < (*other) }
113 fn le(&self, other: &f64) -> bool { (*self) <= (*other) }
115 fn ge(&self, other: &f64) -> bool { (*self) >= (*other) }
117 fn gt(&self, other: &f64) -> bool { (*self) > (*other) }
121 fn eq(&self, other: &f64) -> bool { (*self) == (*other) }
124 impl Default for f64 {
126 fn default() -> f64 { 0.0 }
129 impl Primitive for f64 {}
135 fn zero() -> f64 { 0.0 }
137 /// Returns true if the number is equal to either `0.0` or `-0.0`
139 fn is_zero(&self) -> bool { *self == 0.0 || *self == -0.0 }
144 fn one() -> f64 { 1.0 }
148 impl Add<f64,f64> for f64 {
150 fn add(&self, other: &f64) -> f64 { *self + *other }
153 impl Sub<f64,f64> for f64 {
155 fn sub(&self, other: &f64) -> f64 { *self - *other }
158 impl Mul<f64,f64> for f64 {
160 fn mul(&self, other: &f64) -> f64 { *self * *other }
163 impl Div<f64,f64> for f64 {
165 fn div(&self, other: &f64) -> f64 { *self / *other }
168 impl Rem<f64,f64> for f64 {
170 fn rem(&self, other: &f64) -> f64 {
171 extern { fn fmod(a: f64, b: f64) -> f64; }
172 unsafe { fmod(*self, *other) }
176 impl Neg<f64> for f64 {
178 fn neg(&self) -> f64 { -*self }
181 impl Signed for f64 {
182 /// Computes the absolute value. Returns `NAN` if the number is `NAN`.
184 fn abs(&self) -> f64 {
185 unsafe { intrinsics::fabsf64(*self) }
188 /// The positive difference of two numbers. Returns `0.0` if the number is less than or
189 /// equal to `other`, otherwise the difference between`self` and `other` is returned.
191 fn abs_sub(&self, other: &f64) -> f64 {
192 extern { fn fdim(a: f64, b: f64) -> f64; }
193 unsafe { fdim(*self, *other) }
198 /// - `1.0` if the number is positive, `+0.0` or `INFINITY`
199 /// - `-1.0` if the number is negative, `-0.0` or `NEG_INFINITY`
200 /// - `NAN` if the number is NaN
202 fn signum(&self) -> f64 {
203 if self != self { NAN } else {
204 unsafe { intrinsics::copysignf64(1.0, *self) }
208 /// Returns `true` if the number is positive, including `+0.0` and `INFINITY`
210 fn is_positive(&self) -> bool { *self > 0.0 || (1.0 / *self) == INFINITY }
212 /// Returns `true` if the number is negative, including `-0.0` and `NEG_INFINITY`
214 fn is_negative(&self) -> bool { *self < 0.0 || (1.0 / *self) == NEG_INFINITY }
217 impl Bounded for f64 {
218 // NOTE: this is the smallest non-infinite f32 value, *not* MIN_VALUE
220 fn min_value() -> f64 { -MAX_VALUE }
223 fn max_value() -> f64 { MAX_VALUE }