http://llvm.org/bugs/show_bug.cgi?id=19663
Bug ID: 19663
Summary: bitset ++operator generates invalid end
Product: libc++
Version: unspecified
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
The following program fails with an assertion:
#include <vector>
#include <cassert>
#include <algorithm>
int main()
{
std::vector<bool> bits;
bits.resize(6 * 64, false);
const size_t thePlace = 375;
const size_t start = thePlace + 1;
bits[thePlace] = true;
std::vector<bool>::iterator i = std::find(bits.begin() + start, bits.end(),
true);
assert(i == bits.end());
return i - bits.begin();
}
The expected result is that i should equal end(). It only fails when the bit
vector size is a whole multiple of the word size (64 bit for me).
Looking at i, what surprised me a bit is that __ctz_ (the bit in the word
pointed to) is 64, while for end() it's 0. I suspect that the ++operator
produces the wrong value for "the end" in this case.
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