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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - CV qualifiers are incorrectly stripped from the type of void prvalues"
href="https://bugs.llvm.org/show_bug.cgi?id=48331">48331</a>
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<th>Summary</th>
<td>CV qualifiers are incorrectly stripped from the type of void prvalues
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>trunk
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>Linux
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
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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>jason.e.cobb@gmail.com
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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 creating a prvalue of a cv void type, cv qualifiers are incorrectly
stripped.
Consider:
BEGIN EXAMPLE
#include <type_traits>
template<typename T>
using id_t = T;
static_assert(std::is_same_v<decltype(id_t<void const>()), void>);
END EXAMPLE
On Compiler Explorer: <a href="https://godbolt.org/z/z3PebY">https://godbolt.org/z/z3PebY</a>
GCC, Clang, and MSVC accept. ICC rejects, believing the type to instead be
const void (<a href="https://godbolt.org/z/Tqvjoo">https://godbolt.org/z/Tqvjoo</a>). The results are similar for
volatile.
ICC is correct. The correct type is const void per [expr.type.conv]/2:
<span class="quote">> Otherwise, if the type is cv void and the initializer is () or {} (after pack expansion, if any), the expression is a prvalue of the specified type that performs no initialization.</span ></pre>
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