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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 --- - Error message 'static_cast from 'A *' to 'B *' is not allowed' could probably be more detailed"
href="http://llvm.org/bugs/show_bug.cgi?id=17456">17456</a>
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<th>Summary</th>
<td>Error message 'static_cast from 'A *' to 'B *' is not allowed' could probably be more detailed
</td>
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<th>Product</th>
<td>clang
</td>
</tr>
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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>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>C++
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>dcheng@google.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Example:
cat > a.h << EOF
class A {
};
EOF
cat > b.h << EOF
class B : public A {
};
EOF
cat > c.cc << EOF
#include "a.h"
class B;
void Foo(A* always_a_b) {
B* b = static_cast<B*>(always_a_b);
}
EOF
clang -I. -o c.o c.cc
In this case, I think Clang could be more helpful by describing why the static
cast is not allowed (B is only forward declared and not fully defined).</pre>
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