DoxigAlpha
std › math › big › int.slicesOverlap

slicesOverlap

Function parameters

Parameters

#
a:[]const Limb
b:[]const Limb

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

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fn slicesOverlap(a: []const Limb, b: []const Limb) bool {
    // there is no overlap if a.ptr + a.len <= b.ptr or b.ptr + b.len <= a.ptr
    return @intFromPtr(a.ptr + a.len) > @intFromPtr(b.ptr) and @intFromPtr(b.ptr + b.len) > @intFromPtr(a.ptr);
}