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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - lambda expression in template argument fails"
href="https://bugs.llvm.org/show_bug.cgi?id=44005">44005</a>
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<th>Summary</th>
<td>lambda expression in template argument fails
</td>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>9.0
</td>
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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>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++2a
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>stsp2@yandex.ru
</td>
</tr>
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<th>CC</th>
<td>blitzrakete@gmail.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>The below example is accepted with g++ -std=c++2a:
---
template <auto O>
struct B {
static constexpr int off = O();
};
struct A {
char a;
B<[](){ return 0; }> b;
};
---
But with clang there is an error:
---
$ clang++ -std=c++2a -o offs1 offs1.cpp
offs1.cpp:11:7: error: a lambda expression cannot appear in this context
B<[](){ return 0; }> b;
^
offs1.cpp:11:7: error: a non-type template parameter cannot have type
'A::(lambda at offs1.cpp:11:7)'
offs1.cpp:4:16: note: template parameter is declared here
template <auto O>
^
2 errors generated.
---</pre>
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