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Define EIGEN_CPLUSPLUS and replace most __cplusplus checks.

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The macro `__cplusplus` is not defined correctly in MSVC unless building
with the the `/Zc:__cplusplus` flag. Instead, it defines `_MSVC_LANG` to the
specified c++ standard version number.

Here we introduce `EIGEN_CPLUSPLUS` which will contain the c++ version
number both for MSVC and otherwise.  This simplifies checks for supported
features.

Also replaced most instances of standard version checking via `__cplusplus`
with the existing `EIGEN_COMP_CXXVER` macro for better clarity.

Fixes: #2170
This commit is contained in:
Antonio Sanchez
2021-03-01 15:57:22 -08:00
committed by Rasmus Munk Larsen
parent 82d61af3a4
commit 2468253c9a
10 changed files with 50 additions and 35 deletions
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4
Eigen/src/Core/functors/StlFunctors.h
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@@ -72,7 +72,7 @@ template<typename T>
struct functor_traits<std::not_equal_to<T> >
{ enum { Cost = 1, PacketAccess = false }; };
#if (__cplusplus < 201103L) && (EIGEN_COMP_MSVC <= 1900)
#if (EIGEN_COMP_CXXVER < 11)
// std::binder* are deprecated since c++11 and will be removed in c++17
template<typename T>
struct functor_traits<std::binder2nd<T> >
@@ -83,7 +83,7 @@ struct functor_traits<std::binder1st<T> >
{ enum { Cost = functor_traits<T>::Cost, PacketAccess = false }; };
#endif
#if (__cplusplus < 201703L) && (EIGEN_COMP_MSVC < 1910)
#if (EIGEN_COMP_CXXVER < 17)
// std::unary_negate is deprecated since c++17 and will be removed in c++20
template<typename T>
struct functor_traits<std::unary_negate<T> >