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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Type traits error in c++17 version"
href="https://bugs.llvm.org/show_bug.cgi?id=48507">48507</a>
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<th>Summary</th>
<td>Type traits error in c++17 version
</td>
</tr>
<tr>
<th>Product</th>
<td>libc++
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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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>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>All Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>krylov.yaroslav@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
</td>
</tr></table>
<p>
<div>
<pre>Here is the two strings code using type traits:
```
#include "nlohmann/json.hpp"
static_assert( std::is_copy_assignable<nlohmann::ordered_json>::value, "" );
```
<a href="https://godbolt.org/z/4eqjas">https://godbolt.org/z/4eqjas</a>
It works perfectly with libstdc++, and it works with libc++ using c++11 or
c++14.
But libc++ with c++17 can't compile this code. I tried to dig into problem, to
find the difference between c++17 and non-c++17 in libc++ headers, I tried to
dig into nlohmann json to extract minimal example, but failed.
Root issue on Github: <a href="https://github.com/nlohmann/json/issues/2491">https://github.com/nlohmann/json/issues/2491</a></pre>
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