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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - wrong handling of qualification conversion on top-level pointer/reference parameter in template argument deduction"
href="http://llvm.org/bugs/show_bug.cgi?id=20718">20718</a>
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<th>Summary</th>
<td>wrong handling of qualification conversion on top-level pointer/reference parameter in template argument deduction
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>C++
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>richard-llvm@metafoo.co.uk
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<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
</td>
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<p>
<div>
<pre>Clang (and, it seems, EDG) rejects this valid code:
template<typename T> struct X { typedef typename T::blah type; };
template<class T>
void deduce(typename X<T>::type, const T**) { }
void deduce(...);
int main() {
int **r;
deduce(0, r);
}
... because we incorrectly deduce T=int, then fail when substituting back into
X<T>::type. Per 14.8.2.1/4 bullets 1 and 2, we're only supposed to allow
cv-qualification mismatches here if they can be resolved by a qualification
conversion.
GCC gets this right.</pre>
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