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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 --- - Partially specialized constexpr variable template can't be used in a constant expression"
href="http://llvm.org/bugs/show_bug.cgi?id=20029">20029</a>
</td>
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<th>Summary</th>
<td>Partially specialized constexpr variable template can't be used in a constant expression
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Macintosh
</td>
</tr>
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<th>OS</th>
<td>MacOS X
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Keywords</th>
<td>compile-fail
</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>C++1y
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>ldionne.2@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=12655" name="attach_12655" title="Test code to reproduce error with comments">attachment 12655</a> <a href="attachment.cgi?id=12655&action=edit" title="Test code to reproduce error with comments">[details]</a></span>
Test code to reproduce error with comments
Hi,
The following code does not compile with Clang r210819:
------------------------------------------------------------------------------
template <int i>
struct Foo;
template <typename T>
constexpr bool predicate = true;
template <typename T, bool = predicate<T>>
struct test { };
template struct test<Foo<0>>;
------------------------------------------------------------------------------
The error message is:
------------------------------------------------------------------------------
/Users/ldionne/code/hana/test/sandbox/worksheet.cpp:18:30: error: non-type
template argument is not a constant expression
template <typename T, bool = predicate<T>>
^
/Users/ldionne/code/hana/test/sandbox/worksheet.cpp:21:28: note: while checking
a default template argument used here
template struct test<Foo<0>>;
~~~~~~~~~~~^
1 error generated.
------------------------------------------------------------------------------
The exact command line is:
~/code/llvm-git/build/bin/clang -std=c++1y -fsyntax-only
~/code/hana/test/sandbox/worksheet.cpp
I think this is related to 19571. I also attached a version of the above test
code with a couple of comments showing things I've tried.
Regards,
Louis Dionne</pre>
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