<html>
<head>
<base href="https://llvm.org/bugs/" />
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - erroneous error of circular inheritance"
href="https://llvm.org/bugs/show_bug.cgi?id=26271">26271</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>erroneous error of circular inheritance
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>3.7
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Macintosh
</td>
</tr>
<tr>
<th>OS</th>
<td>MacOS X
</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++11
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>hui.li@me.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>I could be wrong but I don't think the following code has circular inheritance.
And gcc6 compiles it just fine.
#include <type_traits>
#include <utility>
enum color
{
red,
green,
yellow
};
enum shape
{
circle,
square
};
template < color... c >
using colors = std::integer_sequence<color,c...>;
template < shape... s >
using shapes = std::integer_sequence<shape,s...>;
template < color, shape >
struct object
{};
template < typename, typename >
struct objects;
template < color c, shape s >
struct objects<colors<c>,shapes<s>>
: object<c,s>
{};
template < color c, shape... s >
struct objects<colors<c>,shapes<s...>>
: object<c,s>...
{};
template < color... c, shape... s >
struct objects<colors<c...>, shapes<s...>>
: objects<colors<c>,shapes<s...>>...
{};
int main(int argc, const char * argv[])
{
objects<colors<red,green>,shapes<circle>> x;
object<red,circle>& r = x;
(void)r;
}
clang++-mp-3.7 -std=c++1z main.cpp
main.cpp:42:4: error: circular inheritance between 'objects<colors<c>,
shapes<s...> >' and 'objects<integer_sequence<color,
c...>, integer_sequence<shape, s...> >'
: objects<colors<c>,shapes<s...>>...
^</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>