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Add int.Mod(int) and circular shifting

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Oliver Booth 2022-02-13 19:40:38 +00:00
parent 7a0aae3bd5
commit 803032a567
1 changed files with 64 additions and 0 deletions
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64
X10D/src/Int32Extensions/Int32Extensions.cs
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@ -8,6 +8,58 @@ namespace X10D
/// </summary>
public static class Int32Extensions
{
/// <summary>
/// Performs a circular bitwise left-shift on an integer, such that the most-significant bits that are truncated
/// occupy the least-significant bits.
/// </summary>
/// <param name="value">The value to shift.</param>
/// <param name="shift">The shift amount.</param>
/// <returns>The result of the shift.</returns>
public static int CircularLeftShift(this int value, int shift)
{
shift = shift.Mod(32);
if (shift == 0)
{
return value;
}
var pattern = 0;
for (var i = 0; i < shift; i++)
{
pattern |= 1 << (32 - i);
}
var cache = value & pattern;
cache >>= 32 - shift;
return (value << shift) | cache;
}
/// <summary>
/// Performs a circular bitwise right-shift on an integer, such that the least-significant bits that are truncated
/// occupy the most-significant bits.
/// </summary>
/// <param name="value">The value to shift.</param>
/// <param name="shift">The shift amount.</param>
/// <returns>The result of the shift.</returns>
public static int CircularRightShift(this int value, int shift)
{
shift = shift.Mod(32);
if (shift == 0)
{
return value;
}
var pattern = 0;
for (var i = 0; i < shift; i++)
{
pattern |= 1 << i;
}
var cache = value & pattern;
cache <<= 32 - shift;
return (value >> shift) | cache;
}
/// <summary>
/// Converts a Unix time expressed as the number of milliseconds that have elapsed since 1970-01-01T00:00:00Z to a
/// <see cref="DateTimeOffset" /> value.
@ -176,6 +228,18 @@ namespace X10D
return MathUtils.Lerp(value, target, alpha);
}
/// <summary>
/// Performs a modulo operation which supports a negative dividend.
/// </summary>
/// <param name="dividend">The dividend.</param>
/// <param name="divisor">The divisor.</param>
/// <returns>The result of <c>dividend % divisor</c>.</returns>
public static int Mod(this int dividend, int divisor)
{
int r = dividend % divisor;
return r < 0 ? r + divisor : r;
}
/// <summary>
/// Converts the value of the current 32-bit signed integer to an equivalent <see cref="bool" /> value.
/// </summary>