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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - decltype for lambda capture gives wrong type"
href="https://bugs.llvm.org/show_bug.cgi?id=38325">38325</a>
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<th>Summary</th>
<td>decltype for lambda capture gives wrong type
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Frontend
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>antoshkka@gmail.com
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</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>According to my reading of the <a href="http://eel.is/c++draft/expr.prim.id.unqual#2">http://eel.is/c++draft/expr.prim.id.unqual#2</a> the
following code should compile:
#include <type_traits>
#include <cassert>
constexpr std::true_type is_const(int const &) { return {}; }
constexpr std::false_type is_const(int &) { return {}; }
int main() {
int x = 0;
[y = x, x] {
const int z = 0;
assert(is_const(x)); // OK
assert(is_const(y)); // OK
assert(is_const(z)); // OK
static_assert(!decltype(is_const(x))::value, "");
static_assert(decltype(is_const(y))::value, ""); // Fails (OK on GCC)
static_assert(decltype(is_const(z))::value, "");
static_assert(!std::is_const<decltype(x)>::value, "");
static_assert(std::is_const<decltype(y)>::value, ""); // Fails (OK on GCC)
static_assert(std::is_const<decltype(z)>::value, "");
} ();
}
However, two lines marked with "Fails (OK on GCC)" do not pass the asserts.</pre>
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