https://llvm.org/bugs/show_bug.cgi?id=26271
Bug ID: 26271
Summary: erroneous error of circular inheritance
Product: clang
Version: 3.7
Hardware: Macintosh
OS: MacOS X
Status: NEW
Severity: normal
Priority: P
Component: C++11
Assignee: unassignedclangb...@nondot.org
Reporter: hui...@me.com
CC: dgre...@apple.com, llvm-bugs@lists.llvm.org
Classification: Unclassified
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...>>...
^
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