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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - By-copy capture-default causes "const" unless "mutable" despite non-odr-use"
href="http://llvm.org/bugs/show_bug.cgi?id=22604">22604</a>
</td>
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<th>Summary</th>
<td>By-copy capture-default causes "const" unless "mutable" despite non-odr-use
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>All
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>C++14
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>hstong@ca.ibm.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>In the following, it is observed that (consistent with the resolution to
DR1472) the appearance of "ref" in the lambda did not cause the creation of a
corresponding member of the closure type since there is no complaint from Clang
about the deleted copy constructor.
Since said appearance of "ref" does not refer to a member of the closure type,
it appears that Clang wrong in its complaining about "const" in the output
below. At the same time, adding "mutable" to the lambda-declarator should not
make a difference, but it does with Clang.
### SOURCE (<stdin>):
struct A {
A() = default;
A(const A &) = delete;
} globalA;
int main() {
A &ref = globalA, *bar(A &);
[=]() { bar(ref); };
}
### COMPILER INVOCATION:
clang -cc1 -Wno-unused-value -std=c++11 -x c++ -
### ACTUAL OUTPUT:
<stdin>:8:16: error: binding of reference to type 'A' to a value of type 'const
A' drops qualifiers
[=]() { bar(ref); };
^~~
<stdin>:7:30: note: passing argument to parameter here
A &ref = globalA, *bar(A &);
^
1 error generated.
### EXPECTED OUTPUT:
(Clean compile)
### COMPILER VERSION INFO:
clang version 3.7.0 (trunk 229397)
Target: x86_64-unknown-linux-gnu
Thread model: posix
Found candidate GCC installation:
/usr/local/gcc-4.8.2/lib/gcc/x86_64-unknown-linux-gnu/4.8.2
Selected GCC installation:
/usr/local/gcc-4.8.2/lib/gcc/x86_64-unknown-linux-gnu/4.8.2
Candidate multilib: .;@m64
Selected multilib: .;@m64</pre>
</div>
</p>
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