Module `Stdlib.Int64`

64-bit integers.

This module provides operations on the type int64 of signed 64-bit integers. Unlike the built-in int type, the type int64 is guaranteed to be exactly 64-bit wide on all platforms. All arithmetic operations over int64 are taken modulo 2⁶⁴

Performance notice: values of type int64 occupy more memory space than values of type int, and arithmetic operations on int64 are generally slower than those on int. Use int64 only when the application requires exact 64-bit arithmetic.

Literals for 64-bit integers are suffixed by L:

let zero: int64 = 0L
let one: int64 = 1L
let m_one: int64 = -1L

val zero : int64: The 64-bit integer 0.

val one : int64: The 64-bit integer 1.

val minus_one : int64: The 64-bit integer -1.

val neg : int64 -> int64: Unary negation.

val add : int64 -> int64 -> int64: Addition.

val sub : int64 -> int64 -> int64: Subtraction.

val mul : int64 -> int64 -> int64: Multiplication.

val div : int64 -> int64 -> int64: Integer division. Raise Division_by_zero if the second argument is zero. This division rounds the real quotient of its arguments towards zero, as specified for Stdlib.(/).

val unsigned_div : int64 -> int64 -> int64

Same as div, except that arguments and result are interpreted as unsigned 64-bit integers.

since: 4.08.0

val rem : int64 -> int64 -> int64: Integer remainder. If y is not zero, the result of Int64.rem x y satisfies the following property: x = Int64.add (Int64.mul (Int64.div x y) y) (Int64.rem x y). If y = 0, Int64.rem x y raises Division_by_zero.

val unsigned_rem : int64 -> int64 -> int64

Same as rem, except that arguments and result are interpreted as unsigned 64-bit integers.

since: 4.08.0

val succ : int64 -> int64: Successor. Int64.succ x is Int64.add x Int64.one.

val pred : int64 -> int64: Predecessor. Int64.pred x is Int64.sub x Int64.one.

val abs : int64 -> int64: Return the absolute value of its argument.

val max_int : int64: The greatest representable 64-bit integer, 2⁶³ - 1.

val min_int : int64: The smallest representable 64-bit integer, -2⁶³.

val logand : int64 -> int64 -> int64: Bitwise logical and.

val logor : int64 -> int64 -> int64: Bitwise logical or.

val logxor : int64 -> int64 -> int64: Bitwise logical exclusive or.

val lognot : int64 -> int64: Bitwise logical negation.

val shift_left : int64 -> int -> int64: Int64.shift_left x y shifts x to the left by y bits. The result is unspecified if y < 0 or y >= 64.

val shift_right : int64 -> int -> int64: Int64.shift_right x y shifts x to the right by y bits. This is an arithmetic shift: the sign bit of x is replicated and inserted in the vacated bits. The result is unspecified if y < 0 or y >= 64.

val shift_right_logical : int64 -> int -> int64: Int64.shift_right_logical x y shifts x to the right by y bits. This is a logical shift: zeroes are inserted in the vacated bits regardless of the sign of x. The result is unspecified if y < 0 or y >= 64.

val of_int : int -> int64: Convert the given integer (type int) to a 64-bit integer (type int64).

val to_int : int64 -> int: Convert the given 64-bit integer (type int64) to an integer (type int). On 64-bit platforms, the 64-bit integer is taken modulo 2⁶³, i.e. the high-order bit is lost during the conversion. On 32-bit platforms, the 64-bit integer is taken modulo 2³¹, i.e. the top 33 bits are lost during the conversion.

val unsigned_to_int : int64 -> int option

Same as to_int, but interprets the argument as an unsigned integer. Returns None if the unsigned value of the argument cannot fit into an int.

since: 4.08.0

val of_float : float -> int64: Convert the given floating-point number to a 64-bit integer, discarding the fractional part (truncate towards 0). The result of the conversion is undefined if, after truncation, the number is outside the range [Int64.min_int, Int64.max_int].

val to_float : int64 -> float: Convert the given 64-bit integer to a floating-point number.

val of_int32 : int32 -> int64: Convert the given 32-bit integer (type int32) to a 64-bit integer (type int64).

val to_int32 : int64 -> int32: Convert the given 64-bit integer (type int64) to a 32-bit integer (type int32). The 64-bit integer is taken modulo 2³², i.e. the top 32 bits are lost during the conversion.

val of_nativeint : nativeint -> int64: Convert the given native integer (type nativeint) to a 64-bit integer (type int64).

val to_nativeint : int64 -> nativeint: Convert the given 64-bit integer (type int64) to a native integer. On 32-bit platforms, the 64-bit integer is taken modulo 2³². On 64-bit platforms, the conversion is exact.

val of_string : string -> int64

Convert the given string to a 64-bit integer. The string is read in decimal (by default, or if the string begins with 0u) or in hexadecimal, octal or binary if the string begins with 0x, 0o or 0b respectively.

The 0u prefix reads the input as an unsigned integer in the range [0, 2*Int64.max_int+1]. If the input exceeds Int64.max_int it is converted to the signed integer Int64.min_int + input - Int64.max_int - 1.

The _ (underscore) character can appear anywhere in the string and is ignored. Raise Failure "Int64.of_string" if the given string is not a valid representation of an integer, or if the integer represented exceeds the range of integers representable in type int64.

val of_string_opt : string -> int64 option

Same as of_string, but return None instead of raising.

since: 4.05

val to_string : int64 -> string: Return the string representation of its argument, in decimal.

val bits_of_float : float -> int64: Return the internal representation of the given float according to the IEEE 754 floating-point 'double format' bit layout. Bit 63 of the result represents the sign of the float; bits 62 to 52 represent the (biased) exponent; bits 51 to 0 represent the mantissa.

val float_of_bits : int64 -> float: Return the floating-point number whose internal representation, according to the IEEE 754 floating-point 'double format' bit layout, is the given int64.

type t = int64: An alias for the type of 64-bit integers.

val compare : t -> t -> int: The comparison function for 64-bit integers, with the same specification as Stdlib.compare. Along with the type t, this function compare allows the module Int64 to be passed as argument to the functors Set.Make and Map.Make.

val unsigned_compare : t -> t -> int

Same as compare, except that arguments are interpreted as unsigned 64-bit integers.

since: 4.08.0

val equal : t -> t -> bool

The equal function for int64s.

since: 4.03.0