DoxigAlpha
std › math › big › int.Managed › copy

copy

Copies the value of the integer to an existing Managed so that they both have the same value. Extra memory will be allocated if the receiver does not have enough capacity.

Function parameters

Parameters

#
self:*Managed

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

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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 copy(self: *Managed, other: Const) !void {
    if (self.limbs.ptr == other.limbs.ptr) return;

    try self.ensureCapacity(other.limbs.len);
    @memcpy(self.limbs[0..other.limbs.len], other.limbs[0..other.limbs.len]);
    self.setMetadata(other.positive, other.limbs.len);
}