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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - decltype of template parameter object is not const"
href="https://bugs.llvm.org/show_bug.cgi?id=49609">49609</a>
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<th>Summary</th>
<td>decltype of template parameter object is not const
</td>
</tr>
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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>PC
</td>
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<th>URL</th>
<td>https://godbolt.org/z/P53nro
</td>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Keywords</th>
<td>compile-fail
</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++2a
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>johelegp@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>blitzrakete@gmail.com, erik.pilkington@gmail.com, johelegp@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>According to <a href="https://timsong-cpp.github.io/cppwp/n4861/temp.param#8">https://timsong-cpp.github.io/cppwp/n4861/temp.param#8</a>,
<span class="quote">> An id-expression naming a non-type template-parameter of class type T denotes a static storage duration object of type const T, known as a template parameter object [...]</span >
See <a href="https://godbolt.org/z/P53nro">https://godbolt.org/z/P53nro</a>.
```C++
#include<type_traits>
template<auto V>constexpr bool is_const{std::is_const_v<decltype(V)>};
struct A{};
static_assert(is_const<A{}>);
const A a;
static_assert(std::is_const_v<decltype(a)>);
```
```
C++
7
<source>:5:1: error: static_assert failed due to requirement 'is_const<A{}>'
static_assert(is_const<A{}>);
^ ~~~~~~~~~~~~~
1 error generated.
Compiler returned: 1
```</pre>
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