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Compare all available lengths prior to entering the loop

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This commit is contained in:
Andrei Alexandrescu 2021-10-15 16:01:29 -04:00
parent 963274f1c1
commit c21f0ea8eb
1 changed files with 17 additions and 4 deletions
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21
std/algorithm/comparison.d
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@ -1003,10 +1003,23 @@ template equal(alias pred = "a == b")
}
else
{
static if (allSatisfy!(hasLength, Ranges))
static foreach (r; rs[1 .. $])
if (rs[0].length != r.length)
return false;
static foreach (i, R; Ranges)
{
static if (hasLength!R)
{
static if (!is(typeof(firstWithLength)))
{
// Found the first range that has length
enum firstWithLength = i;
}
else
{
// Compare the length of the current range against the first with length
if (rs[firstWithLength].length != rs[i].length)
return false;
}
}
}
return equalLoop(rs);
}
}