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add iotaSlice variant with step

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This commit is contained in:
Ilya Yaroshenko 2016-07-30 18:05:29 +02:00
parent 69c00bc1a9
commit 945feb73c5
1 changed files with 21 additions and 2 deletions
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23
std/experimental/ndslice/selection.d
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@ -1724,7 +1724,8 @@ For a multidimensional index, see $(LREF indexSlice).
Params:
N = dimension count
lengths = list of dimension lengths
shift = value of the first element in a slice
shift = value of the first element in a slice (optional)
step = value of the step between elements (optional)
Returns:
`N`-dimensional slice composed of indexes
See_also: $(LREF IotaSlice), $(LREF indexSlice)
@ -1742,6 +1743,15 @@ IotaSlice!N iotaSlice(size_t N)(auto ref size_t[N] lengths, size_t shift = 0)
with (typeof(return)) return Range.init.sliced(lengths, shift);
}
///ditto
IotaSlice!N iotaSlice(size_t N)(auto ref size_t[N] lengths, size_t shift, size_t step)
{
auto iota = iotaSlice(lengths, shift);
foreach (i; Iota!(0, N))
iota._strides[i] *= step;
return iota;
}
///
@safe pure nothrow @nogc unittest
{
@ -1759,7 +1769,7 @@ IotaSlice!N iotaSlice(size_t N)(auto ref size_t[N] lengths, size_t shift = 0)
}
///
@safe pure nothrow unittest
@safe pure nothrow @nogc unittest
{
auto im = iotaSlice([10, 5], 100);
@ -1770,6 +1780,15 @@ IotaSlice!N iotaSlice(size_t N)(auto ref size_t[N] lengths, size_t shift = 0)
assert(cm[2, 1] == 119); // 119 = 100 + (1 + 2) * 5 + (3 + 1)
}
/// `iotaSlice` with step
@safe pure nothrow unittest
{
auto sl = iotaSlice([2, 3], 10, 10);
assert(sl == [[10, 20, 30],
[40, 50, 60]]);
}
/++
Slice composed of flattened indexes.
See_also: $(LREF iotaSlice)