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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 - static cast a derived class to base class with defined type case operators"
href="https://bugs.llvm.org/show_bug.cgi?id=38601">38601</a>
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<th>Summary</th>
<td>static cast a derived class to base class with defined type case operators
</td>
</tr>
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<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>MacOS X
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>new bugs
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>luyi0619@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>#include <iostream>
#include <tuple>
using Base = std::tuple<int,int>;
struct Derived : Base {
template <class ...Ts>
Derived(int x, Ts&&... ts): Base(std::forward<Ts>(ts)...), x(x) {
}
operator int () const {
return x;
}
int x;
};
int main() {
Derived d(1, 2, 3);
Base b = static_cast<Base>(d);
// he output is 0 1 in clang++, but the expected output is 2 3
std::cout << std::get<0>(b) << " " << std::get<1>(b) << std::endl;
return 0;
}</pre>
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