1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
|
// 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.
* On the other hand, visual studio still doesn't claim to support C++11 although it's
* compliant enugh for our purpose.
*/
#if (EIGEN_COMP_CXXVER < 11)
#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 {
namespace internal {
/* std::get is only constexpr in C++14, not yet in C++11
*/
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_]; }
/* 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;
*/
|
