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fix Issue 8240 - std.algorithm.joiner and empty inputRangeObject

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In this case, _current member is invalid at the start of iteration.
Then joiner should have additional member _valid_current.
This commit is contained in:
k-hara 2012-06-15 13:23:15 +09:00
parent 63732aed0b
commit bf1a32fdfc
1 changed files with 6 additions and 1 deletions
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7
std/algorithm.d
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@ -2542,6 +2542,7 @@ if (isInputRange!RoR && isInputRange!(ElementType!RoR))
private:
RoR _items;
ElementType!RoR _current;
bool _valid_current;
void prepare()
{
for (;; _items.popFront())
@ -2550,6 +2551,7 @@ if (isInputRange!RoR && isInputRange!(ElementType!RoR))
if (!_items.front.empty) break;
}
_current = _items.front;
_valid_current = true;
_items.popFront();
}
public:
@ -2566,7 +2568,7 @@ if (isInputRange!RoR && isInputRange!(ElementType!RoR))
{
@property auto empty()
{
return _current.empty;
return !_valid_current || _current.empty;
}
}
@property auto ref front()
@ -2614,6 +2616,9 @@ unittest
auto j = joiner(a);
j.front() = 44;
assert(a == [ [44, 2, 3], [42, 43] ]);
// bugzilla 8240
assert(equal(joiner([inputRangeObject("")]), ""));
}
// uniq