# Module Nativeint

    module Nativeint: sig .. end

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.

    val neg : nativeint -> nativeint

Unary negation.

    val add : nativeint -> nativeint -> nativeint

Addition.

    val sub : nativeint -> nativeint -> nativeint

Subtraction.

    val mul : nativeint -> nativeint -> nativeint

Multiplication.

    val div : nativeint -> nativeint -> nativeint

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 `(/)`.

    val rem : nativeint -> nativeint -> nativeint

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.

    val logand : nativeint -> nativeint -> nativeint

Bitwise logical and.

    val logor : nativeint -> nativeint -> nativeint

Bitwise logical or.

    val logxor : nativeint -> nativeint -> nativeint

Bitwise logical exclusive or.

    val lognot : nativeint -> nativeint

Bitwise logical negation.

    val shift_left : nativeint -> int -> nativeint

`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.

    val shift_right : nativeint -> int -> nativeint

`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`.

    val shift_right_logical : nativeint -> int -> nativeint

`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`.

    val of_int : int -> nativeint

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

    val to_int : nativeint -> int

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

    val of_float : float -> nativeint

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`].

    val to_float : nativeint -> float

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

    val of_int32 : int32 -> nativeint

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

    val to_int32 : nativeint -> 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.

    val of_string : string -> nativeint

Convert the given string to a native 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*Nativeint.max_int+1]`. If the input exceeds `Nativeint.max_int` it is converted to the signed integer `Int64.min_int + input - Nativeint.max_int - 1`.

Raise `Failure "Nativeint.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.

- Since 4.05

    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 `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.

- Since 4.03.0