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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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2
doc/examples/nullary_indexing.cpp
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@@ -56,7 +56,7 @@ int main()
B = mat_indexing(A, ri+1, ci);
std::cout << "A(ri+1,ci) =" << std::endl;
std::cout << B << std::endl << std::endl;
#if __cplusplus >= 201103L
#if EIGEN_COMP_CXXVER >= 11
B = mat_indexing(A, ArrayXi::LinSpaced(13,0,12).unaryExpr([](int x){return x%4;}), ArrayXi::LinSpaced(4,0,3));
std::cout << "A(ArrayXi::LinSpaced(13,0,12).unaryExpr([](int x){return x%4;}), ArrayXi::LinSpaced(4,0,3)) =" << std::endl;
std::cout << B << std::endl << std::endl;