https://bugs.llvm.org/show_bug.cgi?id=39263
Bug ID: 39263
Summary: Clang wrongly reports duplicate member error on using
recursive template
Product: clang
Version: 7.0
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: C++
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
I am using Clang 7.0 on Windows 10, but could reproduce the issue on Compiler
Explorer using different compiler versions.
The following code compiles fine on GCC (tested with 4.2 (!) and 4.8 and other
versions available on Compiler Explorer), and on MSVC 19 (again on CE).
But yields error on every clang I tried, both on my local machine as well as on
Compiler Explorer.
The code requires boost (tested with 1.52 and newer)
Code:
```
#include <boost/mpl/integral_c.hpp>
struct r_base {};
typedef long long r_value_t;
template<r_value_t N, r_value_t D = 1>
struct r : r_base
{
static const r_value_t n = N;
static const r_value_t d = D;
};
template<r_value_t X>
struct a : boost::mpl::integral_c<r_value_t, (X < 0) ? -X : X> {};
template<r_value_t U, r_value_t V>
struct g : g<V, U % V> {};
template<r_value_t U>
struct g<U, 0> : a<U> {};
template<typename T>
struct r_r
{
static const r_value_t n = a<T::n>::value;
static const r_value_t d = a<T::d>::value; // error happens here: d is
duplicate member
static const r_value_t g = g<n, d>::value;
};
Clang reports the errors:
<source>:29:37: error: duplicate member 'd'
static const r_value_t g = g<n, d>::value;
^
<source>:28:28: note: previous declaration is here
static const r_value_t d = a<T::d>::value;
^
<source>:29:38: error: expected ';' at end of declaration list
static const r_value_t g = g<n, d>::value;
^
;
```
Thank you in advance.
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