본문으로 건너뛰기

Module std::u64

use std::ascii;
use std::option;
use std::string;
use std::vector;

Function bitwise_not​

Returns the bitwise not of the value.
Each bit that is 1 becomes 0. Each bit that is 0 becomes 1.

public fun bitwise_not(x: u64): u64

Function max​

Return the larger of x and y

public fun max(x: u64, y: u64): u64

Function min​

Return the smaller of x and y

public fun min(x: u64, y: u64): u64

Function diff​

Return the absolute value of x - y

public fun diff(x: u64, y: u64): u64

Function divide_and_round_up​

Calculate x / y, but round up the result.

public fun divide_and_round_up(x: u64, y: u64): u64

Function pow​

Return the value of a base raised to a power

public fun pow(base: u64, exponent: u8): u64

Function sqrt​

Get a nearest lower integer Square Root for x. Given that this function can only operate with integers, it is impossible to get perfect (or precise) integer square root for some numbers.

Example:

math::sqrt(9) => 3
math::sqrt(8) => 2 // the nearest lower square root is 4;

In integer math, one of the possible ways to get results with more precision is to use higher values or temporarily multiply the value by some bigger number. Ideally if this is a square of 10 or 100.

Example:

math::sqrt(8) => 2;
math::sqrt(8 * 10000) => 282;
// now we can use this value as if it was 2.82;
// but to get the actual result, this value needs
// to be divided by 100 (because sqrt(10000)).


math::sqrt(8 * 1000000) => 2828; // same as above, 2828 / 1000 (2.828)
public fun sqrt(x: u64): u64

Function try_as_u8​

Try to convert a u64 to a u8. Returns None if the value is too large.

public fun try_as_u8(x: u64): std::option::Option<u8>

Function try_as_u16​

Try to convert a u64 to a u16. Returns None if the value is too large.

public fun try_as_u16(x: u64): std::option::Option<u16>

Function try_as_u32​

Try to convert a u64 to a u32. Returns None if the value is too large.

public fun try_as_u32(x: u64): std::option::Option<u32>

Function to_string​

public fun to_string(x: u64): std::string::String

Function checked_add​

Try to add x and y.
Returns None if the addition would overflow.

public fun checked_add(x: u64, y: u64): std::option::Option<u64>

Function checked_sub​

Try to subtract y from x.
Returns None if y > x.

public fun checked_sub(x: u64, y: u64): std::option::Option<u64>

Function checked_mul​

Try to multiply x and y.
Returns None if the multiplication would overflow.

public fun checked_mul(x: u64, y: u64): std::option::Option<u64>

Function checked_div​

Try to divide x by y.
Returns None if y is zero.

public fun checked_div(x: u64, y: u64): std::option::Option<u64>

Function saturating_add​

Add x and y, saturating at the maximum value instead of overflowing.

public fun saturating_add(x: u64, y: u64): u64

Function saturating_sub​

Subtract y from x, saturating at 0 instead of underflowing.

public fun saturating_sub(x: u64, y: u64): u64

Function saturating_mul​

Multiply x and y, saturating at the maximum value instead of overflowing.

public fun saturating_mul(x: u64, y: u64): u64

Function checked_shl​

Shifts x left by shift bits.
Returns None if the shift is greater than or equal to the bit size of 64.

public fun checked_shl(x: u64, shift: u8): std::option::Option<u64>

Function checked_shr​

Shifts x right by shift bits.
Returns None if the shift is greater than or equal to the bit size of 64.

public fun checked_shr(x: u64, shift: u8): std::option::Option<u64>

Function lossless_shl​

Shifts x left by shift bits.
Returns None if the shift is larger than or equal to the bit size of 64, or if the shift would lose any bits (if the operation is not reversible).

public fun lossless_shl(x: u64, shift: u8): std::option::Option<u64>

Function lossless_shr​

Shifts x right by shift bits.
Returns None if the shift is larger than or equal to the bit size of 64, or if the shift would lose any bits (if the operation is not reversible).

public fun lossless_shr(x: u64, shift: u8): std::option::Option<u64>

Function lossless_div​

Divides x by y.
Returns None if y is zero or if there is a non-zero remainder (if x % y != 0). In other words, it returns None if the operation is not reversible.

public fun lossless_div(x: u64, y: u64): std::option::Option<u64>

Macro function max_value​

Maximum value for a u64

public macro fun max_value(): u64

Macro function range_do​

Loops applying $f to each number from $start to $stop (exclusive)

public macro fun range_do<$R: drop>($start: u64, $stop: u64, $f: |u64| -> $R)

Macro function range_do_eq​

Loops applying $f to each number from $start to $stop (inclusive)

public macro fun range_do_eq<$R: drop>($start: u64, $stop: u64, $f: |u64| -> $R)

Macro function do​

Loops applying $f to each number from 0 to $stop (exclusive)

public macro fun do<$R: drop>($stop: u64, $f: |u64| -> $R)

Macro function do_eq​

Loops applying $f to each number from 0 to $stop (inclusive)

public macro fun do_eq<$R: drop>($stop: u64, $f: |u64| -> $R)