52 lines
2.2 KiB
V
52 lines
2.2 KiB
V
// Copyright (c) 2019-2021 Alexander Medvednikov. All rights reserved.
|
|
// Use of this source code is governed by an MIT license
|
|
// that can be found in the LICENSE file.
|
|
module math
|
|
|
|
pub const (
|
|
e = 2.71828182845904523536028747135266249775724709369995957496696763
|
|
pi = 3.14159265358979323846264338327950288419716939937510582097494459
|
|
pi_2 = pi / 2.0
|
|
pi_4 = pi / 4.0
|
|
phi = 1.61803398874989484820458683436563811772030917980576286213544862
|
|
tau = 6.28318530717958647692528676655900576839433879875021164194988918
|
|
sqrt2 = 1.41421356237309504880168872420969807856967187537694807317667974
|
|
sqrt_e = 1.64872127070012814684865078781416357165377610071014801157507931
|
|
sqrt_pi = 1.77245385090551602729816748334114518279754945612238712821380779
|
|
sqrt_tau = 2.50662827463100050241576528481104525300698674060993831662992357
|
|
sqrt_phi = 1.27201964951406896425242246173749149171560804184009624861664038
|
|
ln2 = 0.693147180559945309417232121458176568075500134360255254120680009
|
|
log2_e = 1.0 / ln2
|
|
ln10 = 2.30258509299404568401799145468436420760110148862877297603332790
|
|
log10_e = 1.0 / ln10
|
|
)
|
|
|
|
// Floating-point limit values
|
|
// max is the largest finite value representable by the type.
|
|
// smallest_non_zero is the smallest positive, non-zero value representable by the type.
|
|
pub const (
|
|
max_f32 = 3.40282346638528859811704183484516925440e+38 // 2**127 * (2**24 - 1) / 2**23
|
|
smallest_non_zero_f32 = 1.401298464324817070923729583289916131280e-45 // 1 / 2**(127 - 1 + 23)
|
|
max_f64 = 1.797693134862315708145274237317043567981e+308 // 2**1023 * (2**53 - 1) / 2**52
|
|
smallest_non_zero_f64 = 4.940656458412465441765687928682213723651e-324 // 1 / 2**(1023 - 1 + 52)
|
|
)
|
|
|
|
// Integer limit values
|
|
pub const (
|
|
max_i8 = 127
|
|
min_i8 = -128
|
|
max_i16 = 32767
|
|
min_i16 = -32768
|
|
max_i32 = 2147483647
|
|
min_i32 = -2147483648
|
|
// -9223372036854775808 is wrong because C compilers parse literal values
|
|
// without sign first, and 9223372036854775808 overflows i64, hence the
|
|
// consecutive subtraction by 1
|
|
min_i64 = i64(-9223372036854775807 - 1)
|
|
max_i64 = i64(9223372036854775807)
|
|
max_u8 = 255
|
|
max_u16 = 65535
|
|
max_u32 = u32(4294967295)
|
|
max_u64 = u64(18446744073709551615)
|
|
)
|