include module type of Core.Int64
Interface from Base
val globalize : int64 -> int64
include Base.Floatable.S with type t := int64
val of_float : float -> int64
val to_float : int64 -> float
include Base.Intable.S with type t := int64
val of_int_exn : int -> int64
val to_int_exn : int64 -> int
include Base.Comparable.With_zero with type t := int64
val is_positive : int64 -> bool
val is_non_negative : int64 -> bool
val is_negative : int64 -> bool
val is_non_positive : int64 -> bool
Returns Neg
, Zero
, or Pos
in a way consistent with the above functions.
val compare__local : int64 -> int64 -> int
val equal__local : int64 -> int64 -> bool
val of_string_opt : string -> int64 option
val to_string_hum : ?delimiter:char -> int64 -> string
delimiter
is an underscore by default.
Infix operators and constants
Negation
There are two pairs of integer division and remainder functions, /%
and %
, and /
and rem
. They both satisfy the same equation relating the quotient and the remainder:
x = (x /% y) * y + (x % y);
x = (x / y) * y + (rem x y);
The functions return the same values if x
and y
are positive. They all raise if y = 0
.
The functions differ if x < 0
or y < 0
.
If y < 0
, then %
and /%
raise, whereas /
and rem
do not.
x % y
always returns a value between 0 and y - 1
, even when x < 0
. On the other hand, rem x y
returns a negative value if and only if x < 0
; that value satisfies abs (rem x y) <= abs y - 1
.
val rem : int64 -> int64 -> int64
Other common functions
round
rounds an int to a multiple of a given to_multiple_of
argument, according to a direction dir
, with default dir
being `Nearest
. round
will raise if to_multiple_of <= 0
. If the result overflows (too far positive or too far negative), round
returns an incorrect result.
| `Down | rounds toward Int.neg_infinity |
| `Up | rounds toward Int.infinity |
| `Nearest | rounds to the nearest multiple, or `Up in case of a tie |
| `Zero | rounds toward zero |
Here are some examples for round ~to_multiple_of:10
for each direction:
| `Down | {10 .. 19} --> 10 | { 0 ... 9} --> 0 | {-10 ... -1} --> -10 |
| `Up | { 1 .. 10} --> 10 | {-9 ... 0} --> 0 | {-19 .. -10} --> -10 |
| `Zero | {10 .. 19} --> 10 | {-9 ... 9} --> 0 | {-19 .. -10} --> -10 |
| `Nearest | { 5 .. 14} --> 10 | {-5 ... 4} --> 0 | {-15 ... -6} --> -10 |
For convenience and performance, there are variants of round
with dir
hard-coded. If you are writing performance-critical code you should use these.
val round :
?dir:[ `Zero | `Nearest | `Up | `Down ] ->
int64 ->
to_multiple_of:int64 ->
int64
val round_towards_zero : int64 -> to_multiple_of:int64 -> int64
val round_down : int64 -> to_multiple_of:int64 -> int64
val round_up : int64 -> to_multiple_of:int64 -> int64
val round_nearest : int64 -> to_multiple_of:int64 -> int64
Successor and predecessor functions
val succ : int64 -> int64
val pred : int64 -> int64
Exponentiation
val pow : int64 -> int64 -> int64
pow base exponent
returns base
raised to the power of exponent
. It is OK if base <= 0
. pow
raises if exponent < 0
, or an integer overflow would occur.
Bit-wise logical operations
val bit_and : int64 -> int64 -> int64
These are identical to land
, lor
, etc. except they're not infix and have different names.
val bit_or : int64 -> int64 -> int64
val bit_xor : int64 -> int64 -> int64
val bit_not : int64 -> int64
val popcount : int64 -> int
Returns the number of 1 bits in the binary representation of the input.
Bit-shifting operations
The results are unspecified for negative shifts and shifts >= num_bits
.
val shift_left : int64 -> int -> int64
Shifts left, filling in with zeroes.
val shift_right : int64 -> int -> int64
Shifts right, preserving the sign of the input.
Increment and decrement functions for integer references
val decr : int64 ref -> unit
val incr : int64 ref -> unit
val of_int32_exn : int32 -> int64
val to_int32_exn : int64 -> int32
val of_int64_exn : int64 -> int64
val to_int64 : int64 -> int64
val of_nativeint_exn : nativeint -> int64
val to_nativeint_exn : int64 -> nativeint
val of_float_unchecked : float -> int64
of_float_unchecked
truncates the given floating point number to an integer, rounding towards zero. The result is unspecified if the argument is nan or falls outside the range of representable integers.
The number of bits available in this integer type. Note that the integer representations are signed.
The largest representable integer.
The smallest representable integer.
val shift_right_logical : int64 -> int -> int64
Shifts right, filling in with zeroes, which will not preserve the sign of the input.
val ceil_pow2 : int64 -> int64
ceil_pow2 x
returns the smallest power of 2 that is greater than or equal to x
. The implementation may only be called for x > 0
. Example: ceil_pow2 17 = 32
val floor_pow2 : int64 -> int64
floor_pow2 x
returns the largest power of 2 that is less than or equal to x
. The implementation may only be called for x > 0
. Example: floor_pow2 17 = 16
val ceil_log2 : int64 -> int
ceil_log2 x
returns the ceiling of log-base-2 of x
, and raises if x <= 0
.
val floor_log2 : int64 -> int
floor_log2 x
returns the floor of log-base-2 of x
, and raises if x <= 0
.
val is_pow2 : int64 -> bool
is_pow2 x
returns true iff x
is a power of 2. is_pow2
raises if x <= 0
.
Returns the number of leading zeros in the binary representation of the input, as an integer between 0 and one less than num_bits
.
The results are unspecified for t = 0
.
Returns the number of trailing zeros in the binary representation of the input, as an integer between 0 and one less than num_bits
.
The results are unspecified for t = 0
.
Conversion functions
val of_int : int -> int64
val of_int32 : int32 -> int64
val of_int64 : int64 -> int64
val to_int : int64 -> int option
val to_int32 : int64 -> int32 option
val of_nativeint : nativeint -> int64
val to_nativeint : int64 -> nativeint option
Truncating conversions
These functions return the least-significant bits of the input. In cases where optional conversions return Some x
, truncating conversions return x
.
val to_int_trunc : int64 -> int
val to_int32_trunc : int64 -> int32
val to_nativeint_trunc : int64 -> nativeint
Low-level float conversions
val bits_of_float : float -> int64
bits_of_float
will always allocate its result on the heap unless the _unboxed
C function call is chosen by the compiler.
val float_of_bits : int64 -> float
float_of_bits
will always allocate its result on the heap unless the _unboxed
C function call is chosen by the compiler.
Byte swap operations
See Int
's byte swap section for a description of Base's approach to exposing byte swap primitives.
As of writing, these operations do not sign extend unnecessarily on 64 bit machines, unlike their int32 counterparts, and hence, are more performant. See the Int32
module for more details of the overhead entailed by the int32 byteswap functions.
val bswap16 : int64 -> int64
val bswap32 : int64 -> int64
val bswap48 : int64 -> int64
val bswap64 : int64 -> int64
Extensions
include Core.Identifiable.S
with type t := {t}1
with type comparator_witness := comparator_witness
include Base.Stringable.S with type t := {t}1
val of_string : string -> {t}1
val to_string : {t}1 -> string
include Core.Comparable.S_binable
with type t := {t}1
with type comparator_witness := comparator_witness
include Base.Comparable.S
with type t := {t}1
with type comparator_witness := comparator_witness
include Base.Comparisons.S with type t := {t}1
include Base.Comparisons.Infix with type t := {t}1
val (>=) : {t}1 -> {t}1 -> bool
val (<=) : {t}1 -> {t}1 -> bool
val (=) : {t}1 -> {t}1 -> bool
val (>) : {t}1 -> {t}1 -> bool
val (<) : {t}1 -> {t}1 -> bool
val (<>) : {t}1 -> {t}1 -> bool
val equal : {t}1 -> {t}1 -> bool
val compare : {t}1 -> {t}1 -> int
compare t1 t2
returns 0 if t1
is equal to t2
, a negative integer if t1
is less than t2
, and a positive integer if t1
is greater than t2
.
val min : {t}1 -> {t}1 -> {t}1
val max : {t}1 -> {t}1 -> {t}1
val ascending : {t}1 -> {t}1 -> int
ascending
is identical to compare
. descending x y = ascending y x
. These are intended to be mnemonic when used like List.sort ~compare:ascending
and List.sort
~cmp:descending
, since they cause the list to be sorted in ascending or descending order, respectively.
val descending : {t}1 -> {t}1 -> int
val between : {t}1 -> low:{t}1 -> high:{t}1 -> bool
between t ~low ~high
means low <= t <= high
val clamp_exn : {t}1 -> min:{t}1 -> max:{t}1 -> {t}1
clamp_exn t ~min ~max
returns t'
, the closest value to t
such that between t' ~low:min ~high:max
is true.
Raises if not (min <= max)
.
include Core.Quickcheckable.S_int with type t := {t}1
include Core.Quickcheck_intf.S_range with type t := {t}1
gen_incl lower_bound upper_bound
produces values between lower_bound
and upper_bound
, inclusive. It uses an ad hoc distribution that stresses boundary conditions more often than a uniform distribution, while still able to produce any value in the range. Raises if lower_bound > upper_bound
.
gen_uniform_incl lower_bound upper_bound
produces a generator for values uniformly distributed between lower_bound
and upper_bound
, inclusive. Raises if lower_bound > upper_bound
.
gen_log_uniform_incl lower_bound upper_bound
produces a generator for values between lower_bound
and upper_bound
, inclusive, where the number of bits used to represent the value is uniformly distributed. Raises if (lower_bound < 0) ||
(lower_bound > upper_bound)
.
gen_log_incl lower_bound upper_bound
is like gen_log_uniform_incl
, but weighted slightly more in favor of generating lower_bound
and upper_bound
specifically.