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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Possibility for function with cv-qualifier-seq be adjusted to function pointer"
href="https://llvm.org/bugs/show_bug.cgi?id=26685">26685</a>
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<th>Summary</th>
<td>Possibility for function with cv-qualifier-seq be adjusted to function pointer
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>C++
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>droffset@yandex.ru
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Hello!
Simple code:
template <typename T>
struct test
{
typedef void(* type)(T);
};
typedef void foo_t() const;
typedef test<foo_t>::type func_t;
We've got a function type with cv-qualifier-seq acquires the properties of a
function pointer, although it's prohibited by Standard. This behavior occurs in
the entire range of compilers.
Do I understand right that func_t (in this case) is invalid type, and it
shouldn't be compiled?
So we can use it to bypass the restrictions and create a pointer to
cv-qualified function:
template <typename F>
struct create_pointer
{
typedef void func_t(F);
template <typename X>
struct extract
{ typedef X type; };
template <typename X>
struct extract<void(X)>
{ typedef X type; };
typedef typename extract<func_t>::type type;
};
int main()
{
create_pointer<void() const>::type p = 0;
}</pre>
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