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Complete previous backport with is_valid_index_type

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This commit is contained in:
Gael Guennebaud 2019-03-17 22:02:18 +01:00
parent 441b3511de
commit dd93c41618
2 changed files with 28 additions and 0 deletions
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14
Eigen/src/Core/util/Macros.h
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@ -396,6 +396,20 @@
#endif
#endif
// Does the compiler support type_traits?
// - full support of type traits was added only to GCC 5.1.0.
// - 20150626 corresponds to the last release of 4.x libstdc++
#ifndef EIGEN_HAS_TYPE_TRAITS
#if EIGEN_MAX_CPP_VER>=11 && (EIGEN_HAS_CXX11 || EIGEN_COMP_MSVC >= 1700) \
&& ((!EIGEN_COMP_GNUC_STRICT) || EIGEN_GNUC_AT_LEAST(5, 1)) \
&& ((!defined(__GLIBCXX__)) || __GLIBCXX__ > 20150626)
#define EIGEN_HAS_TYPE_TRAITS 1
#define EIGEN_INCLUDE_TYPE_TRAITS
#else
#define EIGEN_HAS_TYPE_TRAITS 0
#endif
#endif
// Does the compiler support variadic templates?
#ifndef EIGEN_HAS_VARIADIC_TEMPLATES
#if EIGEN_MAX_CPP_VER>=11 && (__cplusplus > 199711L || EIGEN_COMP_MSVC >= 1900) \

14
Eigen/src/Core/util/XprHelper.h
View File

@ -34,6 +34,20 @@ inline IndexDest convert_index(const IndexSrc& idx) {
return IndexDest(idx);
}
// true if T can be considered as an integral index (i.e., and integral type or enum)
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
#elif EIGEN_COMP_MSVC
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
#endif
};
};
// promote_scalar_arg is an helper used in operation between an expression and a scalar, like:
// expression * scalar