http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59509
Bug ID: 59509
Summary: template function definition. redefinition error
Product: gcc
Version: 4.9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: ich at az2000 dot de
Test case:
namespace X {
template<typename T> struct Mat{};
template<typename T> struct MatExpr {};
template<typename T>
MatExpr<T> prod(Mat<T> const& A, Mat<T> const& B) { return MatExpr<T>(); }
};
struct Mat2 {};
template<typename T>
X::Mat<T> prod(X::Mat<T> const& A, Mat2 const& B) { return X::Mat<T>(); }
template<typename T1, typename T2>
auto operator*(const T1& a, const T2& b) -> decltype(X::prod(a, b)) {
return X::prod(a, b);
}
template<typename T1, typename T2>
auto operator*(const T1& a, const T2& b) -> decltype(prod(a, b)) {
return prod(a, b);
}
int main() {}
I get the error:
mathutils.hpp:77:6: error: redefinition of 'template<class T1, class T2>
decltype (prod(a, b)) operator*(const T1&, const T2&)'
auto operator*(const T1& a, const T2& b) -> decltype(prod(a, b)) {
^
mathutils.hpp:72:6: note: 'template<class T1, class T2> decltype
(viennacl::linalg::prod(a, b)) operator*(const T1&, const T2&)' previously
declared here
auto operator*(const T1& a, const T2& b) -> decltype(viennacl::linalg::prod(a,
b)) {
^
It compiles fine with Clang 3.3.
