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Diffstat (limited to 'third_party/eigen3/unsupported/Eigen/CXX11/src/Core/util/CXX11Workarounds.h')
| -rw-r--r-- | third_party/eigen3/unsupported/Eigen/CXX11/src/Core/util/CXX11Workarounds.h | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/third_party/eigen3/unsupported/Eigen/CXX11/src/Core/util/CXX11Workarounds.h b/third_party/eigen3/unsupported/Eigen/CXX11/src/Core/util/CXX11Workarounds.h new file mode 100644 index 0000000000..a590cf4e18 --- /dev/null +++ b/third_party/eigen3/unsupported/Eigen/CXX11/src/Core/util/CXX11Workarounds.h @@ -0,0 +1,116 @@ +// This file is part of Eigen, a lightweight C++ template library +// for linear algebra. +// +// Copyright (C) 2013 Christian Seiler <christian@iwakd.de> +// +// This Source Code Form is subject to the terms of the Mozilla +// Public License v. 2.0. If a copy of the MPL was not distributed +// with this file, You can obtain one at http://mozilla.org/MPL/2.0/. + +#ifndef EIGEN_CXX11WORKAROUNDS_H +#define EIGEN_CXX11WORKAROUNDS_H + +/* COMPATIBILITY CHECKS + * (so users of compilers that are too old get some realistic error messages) + */ +#if defined(__INTEL_COMPILER) && (__INTEL_COMPILER < 1310) +#error Intel Compiler only supports required C++ features since version 13.1. +// note that most stuff in principle works with 13.0 but when combining +// some features, at some point 13.0 will just fail with an internal assertion +#elif defined(__GNUC__) && !defined(__clang__) && !defined(__INTEL_COMPILER) && (__GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 6)) +// G++ < 4.6 by default will continue processing the source files - even if we use #error to make +// it error out. For this reason, we use the pragma to make sure G++ aborts at the first error +// it sees. Unfortunately, that is still not our #error directive, but at least the output is +// short enough the user has a chance to see that the compiler version is not sufficient for +// the funky template mojo we use. +#pragma GCC diagnostic error "-Wfatal-errors" +#error GNU C++ Compiler (g++) only supports required C++ features since version 4.6. +#endif + +/* Check that the compiler at least claims to support C++11. It might not be sufficient + * because the compiler may not implement it correctly, but at least we'll know. + */ +#if __cplusplus <= 199711L +#if defined(__GNUC__) && !defined(__clang__) && !defined(__INTEL_COMPILER) +#pragma GCC diagnostic error "-Wfatal-errors" +#endif +#error This library needs at least a C++11 compliant compiler. If you use g++/clang, please enable the -std=c++11 compiler flag. (-std=c++0x on older versions.) +#endif + +namespace Eigen { + +// Use std::array as Eigen array +template <typename T, std::size_t N> using array = std::array<T, N>; + +namespace internal { + +/* std::get is only constexpr in C++14, not yet in C++11 + * - libstdc++ from version 4.7 onwards has it nevertheless, + * so use that + * - libstdc++ older versions: use _M_instance directly + * - libc++ all versions so far: use __elems_ directly + * - all other libs: use std::get to be portable, but + * this may not be constexpr + */ +#if defined(__GLIBCXX__) && __GLIBCXX__ < 20120322 +#define STD_GET_ARR_HACK a._M_instance[I] +#elif defined(_LIBCPP_VERSION) +#define STD_GET_ARR_HACK a.__elems_[I] +#else +#define STD_GET_ARR_HACK std::template get<I, T, N>(a) +#endif + +template<std::size_t I, class T, std::size_t N> constexpr inline T& array_get(std::array<T,N>& a) { return (T&) STD_GET_ARR_HACK; } +template<std::size_t I, class T, std::size_t N> constexpr inline T&& array_get(std::array<T,N>&& a) { return (T&&) STD_GET_ARR_HACK; } +template<std::size_t I, class T, std::size_t N> constexpr inline T const& array_get(std::array<T,N> const& a) { return (T const&) STD_GET_ARR_HACK; } + +template<std::size_t I, class T> constexpr inline T& array_get(std::vector<T>& a) { return a[I]; } +template<std::size_t I, class T> constexpr inline T&& array_get(std::vector<T>&& a) { return a[I]; } +template<std::size_t I, class T> constexpr inline T const& array_get(std::vector<T> const& a) { return a[I]; } + +#undef STD_GET_ARR_HACK + +template <typename T> struct array_size; +template<class T, std::size_t N> struct array_size<const std::array<T,N> > { + static const size_t value = N; +}; +template <typename T> struct array_size; +template<class T, std::size_t N> struct array_size<std::array<T,N> > { + static const size_t value = N; +}; + +/* Suppose you have a template of the form + * template<typename T> struct X; + * And you want to specialize it in such a way: + * template<typename S1, typename... SN> struct X<Foo<S1, SN...>> { ::: }; + * template<> struct X<Foo<>> { ::: }; + * This will work in Intel's compiler 13.0, but only to some extent in g++ 4.6, since + * g++ can only match templates called with parameter packs if the number of template + * arguments is not a fixed size (so inside the first specialization, referencing + * X<Foo<Sn...>> will fail in g++). On the other hand, g++ will accept the following: + * template<typename S...> struct X<Foo<S...>> { ::: }: + * as an additional (!) specialization, which will then only match the empty case. + * But Intel's compiler 13.0 won't accept that, it will only accept the empty syntax, + * so we have to create a workaround for this. + */ +#if defined(__GNUC__) && !defined(__INTEL_COMPILER) +#define EIGEN_TPL_PP_SPEC_HACK_DEF(mt, n) mt... n +#define EIGEN_TPL_PP_SPEC_HACK_DEFC(mt, n) , EIGEN_TPL_PP_SPEC_HACK_DEF(mt, n) +#define EIGEN_TPL_PP_SPEC_HACK_USE(n) n... +#define EIGEN_TPL_PP_SPEC_HACK_USEC(n) , n... +#else +#define EIGEN_TPL_PP_SPEC_HACK_DEF(mt, n) +#define EIGEN_TPL_PP_SPEC_HACK_DEFC(mt, n) +#define EIGEN_TPL_PP_SPEC_HACK_USE(n) +#define EIGEN_TPL_PP_SPEC_HACK_USEC(n) +#endif + +} // end namespace internal + +} // end namespace Eigen + +#endif // EIGEN_CXX11WORKAROUNDS_H + +/* + * kate: space-indent on; indent-width 2; mixedindent off; indent-mode cstyle; + */ |