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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Incorrect error message when assigning to a const member in a mutable lambda"
href="https://bugs.llvm.org/show_bug.cgi?id=41037">41037</a>
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<th>Summary</th>
<td>Incorrect error message when assigning to a const member in a mutable lambda
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>All
</td>
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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++
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>metaprogrammingtheworld@gmail.com
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</tr>
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<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<pre>When capturing a reference-to-const by value in a mutable lambda, an incorrect
error message is produced if attempting to assign to the captured object. The
current error message claims that the variable is being assigned-to in a
non-mutable lambda when in actuality the lambda *is* mutable, but the type of
the captured object is const (so the object is still const from within the body
of the mutable lambda's function call operator).
Example:
//////////
int main() {
int const& ref = 0;
// error: cannot assign to a variable captured by copy in a non-mutable
lambda
[ref]() mutable { ref = 4; }();
}
//////////
This is similar but different from <a class="bz_bug_link
bz_status_NEW "
title="NEW - Incorrect error message when trying to modify a const reference in lambda"
href="show_bug.cgi?id=24016">bug 24016</a>.</pre>
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