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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - constexpr variable template in template member function can't be constant expression"
href="http://llvm.org/bugs/show_bug.cgi?id=19571">19571</a>
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<th>Summary</th>
<td>constexpr variable template in template member function can't be constant expression
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++1y
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>lin90162@gmail.com
</td>
</tr>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
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</tr></table>
<p>
<div>
<pre>Hi.
I've found a bug related with variable template following yesterday's <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - Partial specialization of variable template causes 'unused variable' warning illegally."
href="show_bug.cgi?id=19558">bug
19558</a>.
constexpr variable template used in template member function can't be a
constant expression.
// Test code
template<class T>
constexpr bool is_pointer = false;
template<class T>
constexpr bool is_pointer<T *> = true;
struct X {
template<class T>
void f(){
static_assert( is_pointer<int *>, "is_pointer<int *>" );
}
};
int main()
{
X{}.f<int>(); // Error occurs here
return 0;
}
// End of test code
Compiler output:
prog.cc:10:24: error: static_assert expression is not an integral constant
expression
static_assert( is_pointer<int *>, "is_pointer<int *>" );
^~~~~~~~~~~~~~~~~
1 error generated.
I executed above code with clang 3.5 HEAD (trunk 206991) on Linux PC.
<a href="http://melpon.org/wandbox/permlink/MgEFu1WBEhMKymbw">http://melpon.org/wandbox/permlink/MgEFu1WBEhMKymbw</a></pre>
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