# Returns the result of a binary AND operation on `self` and `i`
#
- # assert 0x10.bin_and(0x01) == 0
+ # assert 0x10.bin_and(0x01) == 0
fun bin_and(i: Int): Int is extern "kernel_Int_Int_binand_0"
# Returns the result of a binary OR operation on `self` and `i`
#
- # assert 0x10.bin_or(0x01) == 0x11
+ # assert 0x10.bin_or(0x01) == 0x11
fun bin_or(i: Int): Int is extern "kernel_Int_Int_binor_0"
# Returns the result of a binary XOR operation on `self` and `i`
#
- # assert 0x101.bin_xor(0x110) == 0x11
+ # assert 0x101.bin_xor(0x110) == 0x11
fun bin_xor(i: Int): Int is extern "kernel_Int_Int_binxor_0"
# Returns the 1's complement of `self`
#
- # assert 0x2F.bin_not == -48
+ # assert 0x2F.bin_not == -48
fun bin_not: Int is extern "kernel_Int_Int_binnot_0"
# Returns the square root of `self`
#
- # assert 16.sqrt == 4
+ # assert 16.sqrt == 4
fun sqrt: Int `{ return sqrt(recv); `}
# Returns the greatest common divisor of `self` and `o`
# Is `self` even ?
#
- # assert 12.is_even
+ # assert 12.is_even
fun is_even: Bool do return self % 2 == 0
# Is `self` odd ?
#
- # assert not 13.is_even
+ # assert not 13.is_even
fun is_odd: Bool do return not is_even
# Returns the `self` raised to the power of `e`.
#
- # assert 2 ** 3 == 8
+ # assert 2 ** 3 == 8
fun **(e: Int): Int
do
return self.to_f.pow(e.to_f).to_i
#
# Returns `1 * 2 * 3 * ... * self-1 * self`
#
- # assert 0.factorial == 1 # by convention for an empty product
- # assert 1.factorial == 1
- # assert 4.factorial == 24
- # assert 9.factorial == 362880
+ # assert 0.factorial == 1 # by convention for an empty product
+ # assert 1.factorial == 1
+ # assert 4.factorial == 24
+ # assert 9.factorial == 362880
fun factorial: Int
do
assert self >= 0
# #assert 0.0.pow(9.0) == 0.0
fun pow(e: Float): Float is extern "kernel_Float_Float_pow_1"
- # Returns the logarithm of `self`.
+ # Natural logarithm of `self`.
#
# assert 0.0.log.is_inf == -1
# #assert 1.0.log == 0.0
fun log: Float is extern "kernel_Float_Float_log_0"
- # Returns **e** raised to `self`.
+ # Logarithm of `self` to base `base`.
+ #
+ # assert 100.0.log_base(10.0) == 2.0
+ # assert 256.0.log_base(2.0) == 8.0
+ fun log_base(base: Float): Float do return log/base.log
+
+ # Returns *e* raised to `self`.
fun exp: Float is extern "kernel_Float_Float_exp_0"
# assert 1.1.ceil == 2.0
# assert -1.34.round == -1.0
# assert -1.67.round == -2.0
fun round: Float is extern "round"
-
+
# Returns a random `Float` in `[0.0 .. self[`.
fun rand: Float is extern "kernel_Float_Float_rand_0"
end
private fun is_inf_extern: Bool is extern "isinf"
+
+ # Linear interpolation between `a` and `b` using `self` as weight
+ #
+ # ~~~
+ # assert 0.0.lerp(0.0, 128.0) == 0.0
+ # assert 0.5.lerp(0.0, 128.0) == 64.0
+ # assert 1.0.lerp(0.0, 128.0) == 128.0
+ # assert -0.5.lerp(0.0, 128.0) == -64.0
+ # ~~~
+ fun lerp(a, b: Float): Float do return (1.0 - self) * a + self * b
end
redef class Collection[ E ]
end
end
+redef class SequenceRead[E]
+ # Optimized for large collections using `[]`
+ redef fun rand
+ do
+ assert not is_empty
+ return self[length.rand]
+ end
+end
+
redef class Sys
init
do