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Add array specialization for copy.

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This commit is contained in:
David Simcha 2011-08-20 20:48:55 -03:00
parent dff57f1c50
commit 95ecfcfa4e
1 changed files with 21 additions and 3 deletions
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24
std/algorithm.d
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@ -5359,11 +5359,29 @@ assert(b[0 .. $ - c.length] == [ 1, 5, 9, 1 ]);
Range2 copy(Range1, Range2)(Range1 source, Range2 target)
if (isInputRange!Range1 && isOutputRange!(Range2, ElementType!Range1))
{
for (; !source.empty; source.popFront())
static if(isArray!Range1 && isArray!Range2 &&
is(Unqual!(typeof(source[0])) == Unqual!(typeof(target[0]))))
{
put(target, source.front);
// Array specialization. This uses optimized memory copying routines
// under the hood and is about 10-20x faster than the generic
// implementation.
enforce(target.length >= source.length,
"Cannot copy a source array into a smaller target array.");
target[0..source.length] = source;
return target[source.length..$];
}
return target;
else
{
// Generic implementation.
for (; !source.empty; source.popFront())
{
put(target, source.front);
}
return target;
}
}
unittest