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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Invalid private member diagnostic of template using with decltype of private member method"
href="https://bugs.llvm.org/show_bug.cgi?id=42348">42348</a>
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<th>Summary</th>
<td>Invalid private member diagnostic of template using with decltype of private member method
</td>
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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>All
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>andyg1001@hotmail.co.uk
</td>
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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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<p>
<div>
<pre>The following code fails to compile with an erroneous error "'Impl' is a
private member of 'S<void>'":
template <typename> struct S
{
private:
template <typename> static constexpr auto Impl();
public:
template <typename X> using U = decltype(Impl<X>());
};
template <typename T> template <typename>
constexpr auto S<T>::Impl() { }
using X = S<void>::U<void>;
The above code compiles in gcc et al. Making the following change allows
compilation:
template <typename> struct S
{
private:
struct W
{
template <typename> static constexpr auto Impl();
};
public:
template <typename X> using U = decltype(W::template Impl<X>());
};
template <typename T> template <typename>
constexpr auto S<T>::W::Impl()
{ }</pre>
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