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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - auto trick for recursive lambdas works with gcc, but not always with clang"
href="https://bugs.llvm.org/show_bug.cgi?id=47564">47564</a>
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<th>Summary</th>
<td>auto trick for recursive lambdas works with gcc, but not always with clang
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>10.0
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>C++14
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>janezz55@gmail.com
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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>Created <span class=""><a href="attachment.cgi?id=23976" name="attach_23976" title="example file illustrating the bug">attachment 23976</a> <a href="attachment.cgi?id=23976&action=edit" title="example file illustrating the bug">[details]</a></span>
example file illustrating the bug
Take this example:
auto const f([](int const i, auto ...) noexcept -> int
{
return i == 1 ? 1 : i * operator()(i - 1);
}
);
under gcc 10.2.0 the lambda will compile and work as expected - and will do so
every time an auto argument is used, but clang 10.0.1 reports:
t.cpp:6:31: error: use of undeclared 'operator()'
If I omit the auto arguments with gcc, it reports:
t.cpp:6:31: error: 'operator()' not defined
However, the auto trick does work with clang - I have more complex lambdas with
which it does work. I find the trick very useful. Could you make it work with
clang every time, just like is the case with gcc?</pre>
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