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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 --- - static constexpr member function of a local struct in a function template is instantiated too late"
href="http://llvm.org/bugs/show_bug.cgi?id=20625">20625</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>static constexpr member function of a local struct in a function template is instantiated too late
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</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>C++11
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>mcypark@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Example:
template <typename T>
void F() {
struct Num {
static constexpr int Get() { return 42; }
};
constexpr int n = Num::Get();
}
int main() {
F<int>();
}
Error message:
a.cc:6:17: error: constexpr variable 'n' must be initialized by a constant
expression
constexpr int n = TNum::Get();
^ ~~~~~~~~~~~
a.cc:10:3: note: in instantiation of function template specialization
'F<int>'
requested here
F<int>();
^
a.cc:6:21: note: undefined function 'Get' cannot be used in a constant
expression
constexpr int n = TNum::Get();
^
a.cc:4:26: note: declared here
static constexpr int Get() { return 42; }
^
1 error generated.</pre>
</div>
</p>
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