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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - using directive picks wrong nearest enclosing namespace"
href="http://llvm.org/bugs/show_bug.cgi?id=15973">15973</a>
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<th>Summary</th>
<td>using directive picks wrong nearest enclosing namespace
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>fweimer@redhat.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>clang++ (default flags, trunk version) does not grok the following code:
namespace outer {
void f(int &);
void g();
namespace inner {
void f(long &);
}
}
void
outer::g()
{
using namespace outer::inner;
int i;
f(i);
long l;
f(l);
}
t.cpp:16:3: error: no matching function for call to 'f'
f(l);
^
t.cpp:2:8: note: candidate function not viable: no known conversion from 'long'
to 'int &' for 1st argument
void f(int &);
^
I looked up the rules, and the using directive should put the f(long &)
declaration in the outer namespace, like this:
namespace outer {
void f(int &);
void f(long &);
void g();
}
void
outer::g()
{
int i;
f(i);
long l;
f(l);
}
(This follows from "During unqualified name lookup […], the names appear as if
they were declared in the nearest enclosing namespace which contains both the
using-directive and the nominated namespace." in [namespace.udir] in C++98.)
It seems that clang considers treats the global namespace as the nearest
enclosing namespace in this case, ignoring the namespace that is implied by the
function's declarator-id.</pre>
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