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retro supports slicing if source range supports slicing

This commit is contained in:
Nathan Sashihara 2019-01-08 20:19:53 -05:00
parent 03e21d4368
commit ff7d20f167
1 changed files with 20 additions and 0 deletions
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20
source/tanya/algorithm/iteration.d
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@ -514,6 +514,22 @@ private struct Retro(Range)
}
}
static if (hasLength!Range && hasSlicing!Range)
{
alias opDollar = length;
auto opSlice(size_t i, size_t j)
in
{
assert(i <= j);
assert(j <= length);
}
do
{
return typeof(this)(this.source[$-j .. $-i]);
}
}
static if (hasAssignableElements!Range)
{
@property void front(ref ElementType!Range value)
@ -609,6 +625,10 @@ if (isBidirectionalRange!Range)
actual.popBack();
assert(actual.back == 2);
assert(actual[1] == 2);
// Check slicing.
auto slice = retro(given[])[1 .. $];
assert(slice.length == 2 && slice.front == 2 && slice.back == 1);
}
// Elements can be assigned