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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - bogus "non-type template argument specializes a template parameter with dependent type" for in-class partial specialization"
href="http://llvm.org/bugs/show_bug.cgi?id=16519">16519</a>
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<th>Summary</th>
<td>bogus "non-type template argument specializes a template parameter with dependent type" for in-class partial specialization
</td>
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<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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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++
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>richard-llvm@metafoo.co.uk
</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>Clang rejects this:
template<typename T, T...N> struct integer_sequence { typedef T value_type; };
template<typename T> struct __make_integer_sequence;
template<typename T, T N> using make_integer_sequence = typename
__make_integer_sequence<T>::template make<N, N % 2>::type;
template<typename T, typename T::value_type ...Extra> struct
__make_integer_sequence_impl;
template<typename T, T ...N, T ...Extra> struct
__make_integer_sequence_impl<integer_sequence<T, N...>, Extra...> {
typedef integer_sequence<T, N..., sizeof...(N) + N..., Extra...> type;
};
template<typename T> struct __make_integer_sequence {
template<T N, T Parity, typename = void> struct make;
template<typename Dummy> struct make<0, 0, Dummy> { typedef
integer_sequence<T> type; };
template<typename Dummy> struct make<1, 1, Dummy> { typedef
integer_sequence<T, 0> type; };
template<T N, typename Dummy> struct make<N, 0, Dummy> :
__make_integer_sequence_impl<make_integer_sequence<T, N/2>> {};
template<T N, typename Dummy> struct make<N, 1, Dummy> :
__make_integer_sequence_impl<make_integer_sequence<T, N/2>, N> {};
};
using X = make_integer_sequence<int, 5>;
... saying ...
<stdin>:13:40: error: non-type template argument specializes a template
parameter with dependent type 'T'
template<typename Dummy> struct make<0, 0, Dummy> { typedef
integer_sequence<T> type; };
^
<stdin>:12:14: note: template parameter is declared here
template<T N, T Parity, typename = void> struct make;
^
This is incorrect: the template parameter does not have a dependent type in a
specialization of __make_integer_sequence, therefore the template has valid
specializations, therefore we are not permitted to reject it.</pre>
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