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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - vector (iterator,iterator) constructor doesn't deduce second arg"
href="https://bugs.llvm.org/show_bug.cgi?id=47497">47497</a>
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<th>Summary</th>
<td>vector (iterator,iterator) constructor doesn't deduce second arg
</td>
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<th>Product</th>
<td>libc++
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>All Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>logan.r.smith0@gmail.com
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
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<p>
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<pre>The following code is rejected by libc++ because the second iterator argument
to vector(iterator, iterator) is not deduced (<a href="https://godbolt.org/z/q8f9Y7">https://godbolt.org/z/q8f9Y7</a>):
#include <iterator>
#include <iostream>
#include <vector>
int main() {
std::vector<int> v({}, std::istream_iterator<int>{});
}
The the following code, however, is accepted (<a href="https://godbolt.org/z/nM4Yh4">https://godbolt.org/z/nM4Yh4</a>):
#include <iterator>
#include <iostream>
#include <vector>
int main() {
std::vector<int> v;
v.assign({}, std::istream_iterator<int>{});
}
I believe this to be a conformance bug.
I stumbled on this in my own code when I noticed that a typo in the following
code was being accepted:
std::vector<int> v(other.cbegin(), other.end()); // note .end(), not .cend()
Since the second argument is not deduced, and the first argument is a const
iterator, the second argument is implicitly converted to a const iterator. This
is a symptom of the same issue, though I think this particular case could
arguably be considered a conforming extension.</pre>
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