1 # This file is part of NIT ( http://www.nitlanguage.org ).
3 # Copyright 2004-2008 Jean Privat <jean@pryen.org>
5 # This file is free software, which comes along with NIT. This software is
6 # distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
7 # without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
8 # PARTICULAR PURPOSE. You can modify it is you want, provided this header
9 # is kept unaltered, and a notification of the changes is added.
10 # You are allowed to redistribute it and sell it, alone or is a part of
13 # Mathematical operations
24 # Returns a random `Int` in `[0 .. self[`.
25 fun rand
: Int is extern "kernel_Int_Int_rand_0"
26 fun bin_and
(i
: Int): Int is extern "kernel_Int_Int_binand_0"
27 fun bin_or
(i
: Int): Int is extern "kernel_Int_Int_binor_0"
28 fun bin_xor
(i
: Int): Int is extern "kernel_Int_Int_binxor_0"
29 fun sqrt
: Int `{ return sqrt(recv); `}
30 # Returns the greatest common divisor of `self` and `o
`
32 # assert 54.gcd(24) == 6
33 # assert -54.gcd(-24) == 6
34 # assert 54.gcd(-24) == -6
35 # assert -54.gcd(24) == -6
36 # assert 12.gcd(6) == 6
39 if self < 0 then return -(-self).gcd(o)
40 if o < 0 then return -(self.gcd(-o))
41 if self == 0 or o == self then return o
42 if o == 0 then return self
43 if self.bin_and(1) == 0 then
44 if o.bin_and(1) == 1 then
45 return self.rshift(1).gcd(o)
47 return self.rshift(1).gcd(o.rshift(1)).lshift(1)
50 if o.bin_and(1) == 0 then return self.gcd(o.rshift(1))
51 if self > o then return (self - o).rshift(1).gcd(o)
52 return (o - self).rshift(1).gcd(self)
58 fun is_even: Bool do return self % 2 == 0
62 # assert not 13.is_even
63 fun is_odd: Bool do return not is_even
67 fun sqrt: Float is extern "kernel_Float_Float_sqrt_0"
68 fun cos: Float is extern "kernel_Float_Float_cos_0"
69 fun sin: Float is extern "kernel_Float_Float_sin_0"
70 fun tan: Float is extern "kernel_Float_Float_tan_0"
71 fun acos: Float is extern "kernel_Float_Float_acos_0"
72 fun asin: Float is extern "kernel_Float_Float_asin_0"
73 fun atan: Float is extern "kernel_Float_Float_atan_0"
74 fun abs: Float `{ return fabs(recv); `}
76 fun pow
(e
: Float): Float is extern "kernel_Float_Float_pow_1"
77 fun log
: Float is extern "kernel_Float_Float_log_0"
78 fun exp
: Float is extern "kernel_Float_Float_exp_0"
80 # assert 1.1.ceil == 2.0
81 # assert 1.9.ceil == 2.0
82 # assert 2.0.ceil == 2.0
83 # assert (-1.5).ceil == -1.0
84 fun ceil
: Float `{ return ceil(recv); `}
86 # assert 1.1.floor == 1.0
87 # assert 1.9.floor == 1.0
88 # assert 2.0.floor == 2.0
89 # assert (-1.5).floor == -2.0
90 fun floor: Float `{ return floor(recv); `}
92 # Returns a random `Float` in `[0.0 .. self[`.
93 fun rand
: Float is extern "kernel_Float_Float_rand_0"
94 fun hypot_with
( b
: Float ) : Float is extern "hypotf"
96 fun is_nan
: Bool is extern "isnan"
98 # Is the float an infinite value
99 # this function returns:
101 # * 1 if self is positive infinity
102 # * -1 if self is negative infinity
105 if is_inf_extern
then
106 if self < 0.0 then return -1
112 private fun is_inf_extern
: Bool is extern "isinf"
115 redef class Collection[ E
]
116 # Return a random element form the collection
117 # There must be at least one element in the collection
120 if is_empty
then abort
121 var rand_index
= length
.rand
124 if rand_index
== 0 then return e
131 fun atan2
(x
: Float, y
: Float): Float is extern "kernel_Any_Any_atan2_2"
132 fun pi
: Float is extern "kernel_Any_Any_pi_0"
133 fun srand_from
(x
: Int) is extern "kernel_Any_Any_srand_from_1"
134 fun srand
is extern "kernel_Any_Any_srand_0"