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fix compilation issue with gcc < 10 and -std=c++2a

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(cherry picked from commit d1bf05639476adbb222e8d09da2faf6ef1ed66f2)
This commit is contained in:
Jörg Buchwald 2022-01-13 01:24:20 +01:00 committed by Antonio Sánchez
parent bd72e4a8c4
commit b5d218d857
1 changed files with 1 additions and 1 deletions
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2
Eigen/src/Core/util/Meta.h
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@ -477,7 +477,7 @@ template<typename T, std::size_t N> struct array_size<std::array<T,N> > {
*
* For C++20, this function just forwards to `std::ssize`, or any ADL discoverable `ssize` function.
*/
#if EIGEN_COMP_CXXVER < 20
#if EIGEN_COMP_CXXVER < 20 || EIGEN_GNUC_AT_MOST(9,4)
template <typename T>
EIGEN_CONSTEXPR auto index_list_size(const T& x) {
using R = std::common_type_t<std::ptrdiff_t, std::make_signed_t<decltype(x.size())>>;