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is_convertible<T,Index> does not seems to work well with MSVC 2013, so let's rather use __is_enum(T) for old MSVC versions

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This commit is contained in:
Gael Guennebaud 2018-05-18 17:02:27 +02:00
parent 4dd767f455
commit a382bc9364
1 changed files with 5 additions and 3 deletions
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2
Eigen/src/Core/util/XprHelper.h
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@ -40,6 +40,8 @@ template<typename T> struct is_valid_index_type
enum { value =
#if EIGEN_HAS_TYPE_TRAITS
internal::is_integral<T>::value || std::is_enum<T>::value
#else if EIGEN_COMP_MSVC >= 1500
internal::is_integral<T>::value || __is_enum(T)
#else
// without C++11, we use is_convertible to Index instead of is_integral in order to treat enums as Index.
internal::is_convertible<T,Index>::value