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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - failed look-up for explicit conversion operator with type deduction"
href="https://bugs.llvm.org/show_bug.cgi?id=33179">33179</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>failed look-up for explicit conversion operator with type deduction
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>All
</td>
</tr>
<tr>
<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>
<tr>
<th>Component</th>
<td>-New Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>eduard@valeyev.net
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>This fails to compile with all clang++ versions unless
DISABLE_EXPLICIT_OPERATOR_AUTO is #defined. GNU and Intel frontends do not
suffer from this issue.
#include <iostream>
template <typename T>
struct A {
A(T v) : value(v) {}
T value;
};
template <typename T, typename Op>
struct B {
B(T v, Op op = Op()) : value(v), op(op) {}
#ifndef DISABLE_EXPLICIT_OPERATOR_AUTO
explicit
#endif
operator auto() const { return op(this->value); }
Op op;
T value;
};
template <typename T>
struct Convert {
A<T> operator()(T v) const {
return A<T>(v + 1);
}
};
int main() {
B<int, Convert<int>> b(1);
A<int> a = static_cast<A<int>>(b);
std::cout << a.value << std::endl;
return 0;
}</pre>
</div>
</p>
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