Module Stdlib.Nativeint

Processor-native integers.

This module provides operations on the type nativeint of signed 32-bit integers (on 32-bit platforms) or signed 64-bit integers (on 64-bit platforms). This integer type has exactly the same width as that of a pointer type in the C compiler. All arithmetic operations over nativeint are taken modulo 232 or 264 depending on the word size of the architecture.

Performance notice: values of type nativeint occupy more memory space than values of type int, and arithmetic operations on nativeint are generally slower than those on int. Use nativeint only when the application requires the extra bit of precision over the int type.

val zero : nativeint

The native integer 0.

val one : nativeint

The native integer 1.

val minus_one : nativeint

The native integer -1.

external neg : nativeint -> nativeint = "%nativeint_neg"

Unary negation.

external add : nativeint -> nativeint -> nativeint = "%nativeint_add"

Addition.

external sub : nativeint -> nativeint -> nativeint = "%nativeint_sub"

Subtraction.

external mul : nativeint -> nativeint -> nativeint = "%nativeint_mul"

Multiplication.

external div : nativeint -> nativeint -> nativeint = "%nativeint_div"

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 Pervasives.(/).

external rem : nativeint -> nativeint -> nativeint = "%nativeint_mod"

Integer remainder. If y is not zero, the result of Nativeint.rem x y satisfies the following properties: Nativeint.zero <= Nativeint.rem x y < Nativeint.abs y and x = Nativeint.add (Nativeint.mul (Nativeint.div x y) y) (Nativeint.rem x y). If y = 0, Nativeint.rem x y raises Division_by_zero.

val succ : nativeint -> nativeint

Successor. Nativeint.succ x is Nativeint.add x Nativeint.one.

val pred : nativeint -> nativeint

Predecessor. Nativeint.pred x is Nativeint.sub x Nativeint.one.

val abs : nativeint -> nativeint

Return the absolute value of its argument.

val size : int

The size in bits of a native integer. This is equal to 32 on a 32-bit platform and to 64 on a 64-bit platform.

val max_int : nativeint

The greatest representable native integer, either 231 - 1 on a 32-bit platform, or 263 - 1 on a 64-bit platform.

val min_int : nativeint

The smallest representable native integer, either -231 on a 32-bit platform, or -263 on a 64-bit platform.

external logand : nativeint -> nativeint -> nativeint = "%nativeint_and"

Bitwise logical and.

external logor : nativeint -> nativeint -> nativeint = "%nativeint_or"

Bitwise logical or.

external logxor : nativeint -> nativeint -> nativeint = "%nativeint_xor"

Bitwise logical exclusive or.

val lognot : nativeint -> nativeint

Bitwise logical negation

external shift_left : nativeint -> int -> nativeint = "%nativeint_lsl"

Nativeint.shift_left x y shifts x to the left by y bits. The result is unspecified if y < 0 or y >= bitsize, where bitsize is 32 on a 32-bit platform and 64 on a 64-bit platform.

external shift_right : nativeint -> int -> nativeint = "%nativeint_asr"

Nativeint.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 >= bitsize.

external shift_right_logical : nativeint -> int -> nativeint = "%nativeint_lsr"

Nativeint.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 >= bitsize.

external of_int : int -> nativeint = "%nativeint_of_int"

Convert the given integer (type int) to a native integer (type nativeint).

external to_int : nativeint -> int = "%nativeint_to_int"

Convert the given native integer (type nativeint) to an integer (type int). The high-order bit is lost during the conversion.

external of_float : float -> nativeint = "caml_nativeint_of_float" "caml_nativeint_of_float_unboxed"

Convert the given floating-point number to a native integer, discarding the fractional part (truncate towards 0). The result of the conversion is undefined if, after truncation, the number is outside the range [Nativeint.min_int, Nativeint.max_int].

external to_float : nativeint -> float = "caml_nativeint_to_float" "caml_nativeint_to_float_unboxed"

Convert the given native integer to a floating-point number.

external of_int32 : int32 -> nativeint = "%nativeint_of_int32"

Convert the given 32-bit integer (type int32) to a native integer.

external to_int32 : nativeint -> int32 = "%nativeint_to_int32"

Convert the given native integer to a 32-bit integer (type int32). On 64-bit platforms, the 64-bit native integer is taken modulo 232, i.e. the top 32 bits are lost. On 32-bit platforms, the conversion is exact.

external of_string : string -> nativeint = "caml_nativeint_of_string"

Convert the given string to a native integer. The string is read in decimal (by default) or in hexadecimal, octal or binary if the string begins with 0x, 0o or 0b respectively. Raise Failure "int_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 nativeint.

val of_string_opt : string -> nativeint option

Same as of_string, but return None instead of raising.

val to_string : nativeint -> string

Return the string representation of its argument, in decimal.

type t = nativeint

An alias for the type of native integers.

val compare : t -> t -> int

The comparison function for native integers, with the same specification as Pervasives.compare. Along with the type t, this function compare allows the module Nativeint to be passed as argument to the functors Set.Make and Map.Make.

val equal : t -> t -> bool

The equal function for native ints.

external format : string -> nativeint -> string = "caml_nativeint_format"

Nativeint.format fmt n return the string representation of the native integer n in the format specified by fmt. fmt is a Printf-style format consisting of exactly one %d, %i, %u, %x, %X or %o conversion specification. This function is deprecated; use Printf.sprintf with a %nx format instead.