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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 --- - CRTP with inhered template member function is not included in overload resolution"
href="https://llvm.org/bugs/show_bug.cgi?id=31406">31406</a>
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<tr>
<th>Summary</th>
<td>CRTP with inhered template member function is not included in overload resolution
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>C++
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>pedro.ferreira@imgtec.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>The following C++ source file compiles fine:
=======
#include <type_traits>
#include <cstdint>
template<typename Base, typename A>
class EnumAlias
{
public:
template<typename E, typename std::enable_if<std::is_enum<E>::value>::type*
= nullptr>
void operator()(E& e)
{
Base& base = *static_cast<Base*>(this);
A& a = (A&)(e);
base(a);
}
};
class Base;
typedef EnumAlias<Base, uint32_t> EnumAliasU32;
class Base : public EnumAliasU32
{
public:
using EnumAliasU32::operator();
template<typename T, typename
std::enable_if<std::is_fundamental<T>::value>::type* = nullptr>
void operator()(const T& e)
{
//something, whatever
}
};
enum SomeEnumTy {};
void Use()
{
SomeEnumTy e;
Base b;
b(e);
}
========
However, if one is to remove "const" from Base::operator(), clang fails with
=======
CRTP.cpp:39:2: error: no matching function for call to object of type 'Base'
b(e);
^
CRTP.cpp:25:47: note: candidate template ignored: disabled by 'enable_if' [with
T = SomeEnumTy]
template<typename T, typename
std::enable_if<std::is_fundamental<T>::value>::type* = nullptr>
^
1 error generated.
=======
G++ accepts the code. Is the input source incorrect?
It seems on the second, the inherited function does not participate in overload
resolution (even though it does when "const" is specified).</pre>
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