DoxigAlpha
std › math › big › int › Mutable › init

init

value is a primitive integer type. Asserts the value fits within the provided limbs_buffer. Note: calcLimbLen can be used to figure out how big an array to allocate for limbs_buffer.

Function parameters

Parameters

#
limbs_buffer:[]Limb
value:anytype

Used to indicate either limit of a 2s-complement integer.

Types

#
TwosCompIntLimit
Used to indicate either limit of a 2s-complement integer.
Mutable
A arbitrary-precision big integer, with a fixed set of mutable limbs.
Const
A arbitrary-precision big integer, with a fixed set of immutable limbs.
Managed
An arbitrary-precision big integer along with an allocator which manages the memory.

Returns the number of limbs needed to store `scalar`, which must be a

Functions

#
calcLimbLen
Returns the number of limbs needed to store `scalar`, which must be a
calcSetStringLimbCount
Assumes `string_len` doesn't account for minus signs if the number is negative.
calcNonZeroTwosCompLimbCount
Compute the number of limbs required to store a 2s-complement number of `bit_count` bits.
calcTwosCompLimbCount
Compute the number of limbs required to store a 2s-complement number of `bit_count` bits.
addMulLimbWithCarry
a + b * c + *carry, sets carry to the overflow bits
llcmp
Returns -1, 0, 1 if |a| < |b|, |a| == |b| or |a| > |b| respectively for limbs.

Source

Implementation

#
pub fn init(limbs_buffer: []Limb, value: anytype) Mutable {
    limbs_buffer[0] = 0;
    var self: Mutable = .{
        .limbs = limbs_buffer,
        .len = 1,
        .positive = true,
    };
    self.set(value);
    return self;
}