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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Stop -Wshadow from catching obviously intended shadowing"
href="http://llvm.org/bugs/show_bug.cgi?id=21110">21110</a>
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<th>Summary</th>
<td>Stop -Wshadow from catching obviously intended shadowing
</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
</td>
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<th>Component</th>
<td>C++
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>seth.cantrell@gmail.com
</td>
</tr>
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<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>-Wshadow ignores (or rather, never notices) shadowing between variables and
lambda captures of those variables, because shadowing is generally reasonable
in such conditions:
int i = 0;
for_each(..., [i] (auto &e) {
// use variable i, no shadowing warning
});
Of course there are times when the a lambda's captures' shadowing might be
problematic and a warning could be appropriate:
int i, j;
[&i = j] { // use i...? }
However ignoring the shadowing by captures is usually the right thing, and it's
a happy accident that this is the current behavior, but there are other
instances where shadowing should be ignored:
class Foo {
int bar, baz;
Foo(int bar, int baz) : bar(bar), baz(baz) {}
};
Ignoring clearly intended cases of shadowing would reduce the false positive
rate of this warning.</pre>
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</p>
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