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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Warn if overload resolution picks f(bool) over f(Foo*) when calling f with a const Foo*"
href="http://llvm.org/bugs/show_bug.cgi?id=19896">19896</a>
</td>
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<th>Summary</th>
<td>Warn if overload resolution picks f(bool) over f(Foo*) when calling f with a const Foo*
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Frontend
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>nicolasweber@gmx.de
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>This:
#include <iostream>
using namespace std;
class Foo {};
class Thingy {
public:
// Thingy can contain a bool, or a Foo.
//static Thingy* newThingy(bool b) {
// cout << "Creating bool Thingy" << endl;
// return NULL;
//}
static Thingy* newThingy(Foo* f) {
cout << "Creating Foo Thingy" << endl;
return NULL;
}
};
class Factory {
public:
static const Foo* gimmeFoo() { return new Foo(); }
};
int main() {
Thingy::newThingy(true);
Thingy::newThingy(Factory::gimmeFoo());
}
produces
Creating bool Thingy
Creating bool Thingy
newThingy(Foo*) can't be called because gimmeFoo() returns a const Foo*.
Because of that, const Foo* doesn't make it into the overload set and
overload-related warnings don't fire. But this is still surprising behavior, so
we should warn on this.</pre>
</div>
</p>
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