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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Explicit specialization of deleted function template not possible"
href="http://llvm.org/bugs/show_bug.cgi?id=17537">17537</a>
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<th>Summary</th>
<td>Explicit specialization of deleted function template not possible
</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>All
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++11
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>jonathan.sauer@gmx.de
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>The following code fails to compile with clang r192096:
template <typename T>
void foo() = delete;
template <>
void foo<int>()
{
}
int main()
{
foo<int>();
}
This results in:
% ~/LLVM/build/Release+Asserts/bin/clang++ -std=c++11 clang.cpp
clang.cpp:5:6: error: redefinition of 'foo'
void foo<int>()
^
clang.cpp:5:6: note: previous definition is here
clang.cpp:11:5: error: no matching function for call to 'foo'
foo<int>();
^~~~~~~~
clang.cpp:2:6: note: candidate template ignored: substitution failure [with T =
int]
void foo() = delete;
^
2 errors generated.
According to ยง14.7.3p1 [temp.expl.spec], it should be allowed to delete a
function template while explicitly specializing it for a few types. This was
introduced by DR941:
| According to 14.7.3 [temp.expl.spec] paragraph 1, only non-deleted function
| templates may be explicitly specialized. There doesn't appear to be a
compelling
| need for this restriction, however, and it could be useful to forbid use of
| implicitly-instantiated specializations while still allowing use of
explicitly-
| specialized versions.
<<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#941">http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#941</a>></pre>
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</p>
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