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Module 0x1::u128

use 0x1::option;
use 0x1::string;

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: u128): u128
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Implementation
public fun bitwise_not(x: u128): u128 {
    x ^ max_value!()
}

Function max​

Return the larger of x and y

public fun max(x: u128, y: u128): u128
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Implementation
public fun max(x: u128, y: u128): u128 {
    std::macros::num_max!(x, y)
}

Function min​

Return the smaller of x and y

public fun min(x: u128, y: u128): u128
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Implementation
public fun min(x: u128, y: u128): u128 {
    std::macros::num_min!(x, y)
}

Function diff​

Return the absolute value of x - y

public fun diff(x: u128, y: u128): u128
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Implementation
public fun diff(x: u128, y: u128): u128 {
    std::macros::num_diff!(x, y)
}

Function divide_and_round_up​

Calculate x / y, but round up the result.

public fun divide_and_round_up(x: u128, y: u128): u128
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Implementation
public fun divide_and_round_up(x: u128, y: u128): u128 {
    std::macros::num_divide_and_round_up!(x, y)
}

Function pow​

Return the value of a base raised to a power

public fun pow(base: u128, exponent: u8): u128
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Implementation
public fun pow(base: u128, exponent: u8): u128 {
    std::macros::num_pow!(base, exponent)
}

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: u128): u128
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Implementation
public fun sqrt(x: u128): u128 {
    std::macros::num_sqrt!<u128, u256>(x, 128)
}

Function try_as_u8​

Try to convert a u128 to a u8. Returns None if the value is too large.

public fun try_as_u8(x: u128): option::Option<u8>
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Implementation
public fun try_as_u8(x: u128): Option<u8> {
    std::macros::try_as_u8!(x)
}

Function try_as_u16​

Try to convert a u128 to a u16. Returns None if the value is too large.

public fun try_as_u16(x: u128): option::Option<u16>
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Implementation
public fun try_as_u16(x: u128): Option<u16> {
    std::macros::try_as_u16!(x)
}

Function try_as_u32​

Try to convert a u128 to a u32. Returns None if the value is too large.

public fun try_as_u32(x: u128): option::Option<u32>
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Implementation
public fun try_as_u32(x: u128): Option<u32> {
    std::macros::try_as_u32!(x)
}

Function try_as_u64​

Try to convert a u128 to a u64. Returns None if the value is too large.

public fun try_as_u64(x: u128): option::Option<u64>
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Implementation
public fun try_as_u64(x: u128): Option<u64> {
    std::macros::try_as_u64!(x)
}

Function to_string​

public fun to_string(x: u128): string::String
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Implementation
public fun to_string(x: u128): String {
    std::macros::num_to_string!(x)
}