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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - incorrect behavior with std::is_same with nested class in a template class"
href="https://llvm.org/bugs/show_bug.cgi?id=30759">30759</a>
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<th>Summary</th>
<td>incorrect behavior with std::is_same with nested class in a template class
</td>
</tr>
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<th>Product</th>
<td>libc++
</td>
</tr>
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<th>Version</th>
<td>3.9
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>All Bugs
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>jeanmichael.celerier@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
</td>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>In this code, the first static_assert compiles with clang++ (and also g++, but
not MSVC) :
#include <type_traits>
template<typename T>
struct foo
{
using sub = struct some_struct;
};
template<typename T>
struct bar
{
using sub = struct some_struct { };
};
int main()
{
static_assert(std::is_same<foo<int>::sub, foo<double>::sub>::value,
"should not pass");
static_assert(std::is_same<bar<int>::sub, bar<double>::sub>::value,
"should not pass");
}
The second does (correctly, in my opinion) not.
Here is the relevant bug report in the gcc bug tracker if it can be useful :
<a href="https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78065">https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78065</a></pre>
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