#int64

This package provides operations for working with 64-bit signed integers (Int64) in MoonBit.

#Basic Operations

Int64 values can be created from regular 32-bit integers using from_int. The package also provides constants for the maximum and minimum values representable by Int64.

///|
test "basic operations" {
  let i : Int64 = -12345L // Int64 literal
  // You can also convert from an `Int` like so:
  inspect(Int64::from_int(-12345) == i, content="true")

  // Max and min values
  inspect(@int64.MAX_VALUE, content="9223372036854775807")
  inspect(@int64.MIN_VALUE, content="-9223372036854775808")

  // Absolute value
  inspect(Int64::abs(i), content="12345")
}

#Binary Representation

Int64 values can be written out in their binary representation, in either big-endian or little-endian byte order, using a Buffer:

///|
test "binary conversion" {
  let x = 258L // Int64 value of 258
  let be_buf = Buffer(size_hint=8)
  be_buf.write_int64_be(x)
  let be_bytes = be_buf.to_bytes()
  let le_buf = Buffer(size_hint=8)
  le_buf.write_int64_le(x)
  let le_bytes = le_buf.to_bytes()

  // Convert to String for inspection
  inspect(
    be_bytes.to_string(),
    content=(
      #|b"\x00\x00\x00\x00\x00\x00\x01\x02"
    ),
  )
  inspect(
    le_bytes.to_string(),
    content=(
      #|b"\x02\x01\x00\x00\x00\x00\x00\x00"
    ),
  )

  // We can verify they represent the same number but in different byte orders
  let len = be_bytes.length()
  inspect(len, content="8")
}

#Method-Style Usage

All operations are also available as methods on Int64 values:

///|
test "method style" {
  let x = -42L

  // Using method syntax for absolute value
  inspect(x.abs(), content="42")

  // Binary conversion via `Buffer`
  let buf = Buffer(size_hint=8)
  buf.write_int64_be(x)
  inspect(
    buf.to_bytes(),
    content=(
      #|b"\xff\xff\xff\xff\xff\xff\xff\xd6"
    ),
  )
}

Note that Int64 implements the Hash trait, allowing it to be used as keys in hash maps and members of hash sets.

MAX_VALUE

source

let MAX_VALUE : Int64

Max value constant for this type.

MIN_VALUE

source

let MIN_VALUE : Int64

Min value constant for this type.

max_value

source

#deprecated("Use `MAX_VALUE` instead")
let max_value : Int64

Max value constant for this type.

min_value

source

#deprecated("Use `MIN_VALUE` instead")
let min_value : Int64

Min value constant for this type.

Source Files

int64.mbt

Site source Report issue Packages Build queue Skills Statistics

#int64

#Basic Operations

#Binary Representation

#Method-Style Usage

#MAX_VALUE

#MIN_VALUE

#max_value

#min_value

Source Files

MAX_VALUE

MIN_VALUE

max_value

min_value