新鲜的Visual Studio项目中包含的任何Eigen 3.3.1文件都不会编译 [英] include of any Eigen 3.3.1 files in fresh Visual Studio project won't compile

问题描述

我在VS2015中创建了一个新的C ++(空)项目，然后将Eigen 3.3.1源代码放置在解决方案目录中的"inc"文件夹中，例如，到Matrix.h的路径为 inc/Eigen/Core/.我已将此 inc/路径设置为其他包含目录，并且还尝试将 inc/Eigen/作为另一个包含目录，以防文件之间出现问题，但这并没有改变.

I created a fresh C++ (empty) project in VS2015, and then placed the Eigen 3.3.1 source code in an 'inc' folder in solution dir, such that the path to Matrix.h, for example, is inc/Eigen/Core/. I have set this inc/ path as an additional include directory, and have also tried with inc/Eigen/ as another include directory in case the files had issues including each other, but this changed nothing.

在main.cpp中，我有以下内容:

In main.cpp, I have the following:

#include "Eigen/Core/Matrix.h"

int main()
{
    return 0;
}

在为x64编译时，这给了我:

This gives me, when compiling for x64:

1>c:\users\brody\documents\visual studio 2015\projects\eigentest\inc\eigen\core\matrix.h(18): error C2988: unrecognizable template declaration/definition
1>c:\users\brody\documents\visual studio 2015\projects\eigentest\inc\eigen\core\matrix.h(18): error C2143: syntax error: missing ';' before '<'
1>c:\users\brody\documents\visual studio 2015\projects\eigentest\inc\eigen\core\matrix.h(18): error C2059: syntax error: '<'
1>c:\users\brody\documents\visual studio 2015\projects\eigentest\inc\eigen\core\matrix.h(19): error C2143: syntax error: missing ';' before '{'
1>c:\users\brody\documents\visual studio 2015\projects\eigentest\inc\eigen\core\matrix.h(19): error C2447: '{': missing function header (old-style formal list?)
1>c:\users\brody\documents\visual studio 2015\projects\eigentest\inc\eigen\core\matrix.h(179): error C2143: syntax error: missing ',' before '<'
1>  c:\users\brody\documents\visual studio 2015\projects\eigentest\inc\eigen\core\matrix.h(404): note: see reference to class template instantiation 'Eigen::Matrix<_Scalar,_Rows,_Cols,_Options,_MaxRows,_MaxCols>' being compiled
1>c:\users\brody\documents\visual studio 2015\projects\eigentest\inc\eigen\core\matrix.h(186): error C2143: syntax error: missing ';' before '<'
1>c:\users\brody\documents\visual studio 2015\projects\eigentest\inc\eigen\core\matrix.h(186): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\users\brody\documents\visual studio 2015\projects\eigentest\inc\eigen\core\matrix.h(186): error C2238: unexpected token(s) preceding ';'
1>c:\users\brody\documents\visual studio 2015\projects\eigentest\inc\eigen\core\matrix.h(192): error C2653: 'Base': is not a class or namespace name
1>c:\users\brody\documents\visual studio 2015\projects\eigentest\inc\eigen\core\matrix.h(192): error C2144: syntax error: 'int' should be preceded by ';'
1>c:\users\brody\documents\visual studio 2015\projects\eigentest\inc\eigen\core\matrix.h(192): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\users\brody\documents\visual studio 2015\projects\eigentest\inc\eigen\core\matrix.h(192): warning C4183: 'EIGEN_DENSE_PUBLIC_INTERFACE': missing return type; assumed to be a member function returning 'int'
1>c:\users\brody\documents\visual studio 2015\projects\eigentest\inc\eigen\core\matrix.h(192): error C3646: 'PlainObject': unknown override specifier
1>c:\users\brody\documents\visual studio 2015\projects\eigentest\inc\eigen\core\matrix.h(194): error C2653: 'Base': is not a class or namespace name
1>c:\users\brody\documents\visual studio 2015\projects\eigentest\inc\eigen\core\matrix.h(195): error C2653: 'Base': is not a class or namespace name
1>c:\users\brody\documents\visual studio 2015\projects\eigentest\inc\eigen\core\matrix.h(206): error C3646: 'EIGEN_STRONG_INLINE': unknown override specifier
1>c:\users\brody\documents\visual studio 2015\projects\eigentest\inc\eigen\core\matrix.h(206): error C3646: 'Matrix': unknown override specifier
1>c:\users\brody\documents\visual studio 2015\projects\eigentest\inc\eigen\core\matrix.h(206): error C2143: syntax error: missing ';' before '&'
1>c:\users\brody\documents\visual studio 2015\projects\eigentest\inc\eigen\core\matrix.h(206): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\users\brody\documents\visual studio 2015\projects\eigentest\inc\eigen\core\matrix.h(207): error C2334: unexpected token(s) preceding '{'; skipping apparent function body
1>c:\users\brody\documents\visual studio 2015\projects\eigentest\inc\eigen\core\matrix.h(223): error C2061: syntax error: identifier 'EIGEN_STRONG_INLINE'
1>c:\users\brody\documents\visual studio 2015\projects\eigentest\inc\eigen\core\matrix.h(237): error C2334: unexpected token(s) preceding '{'; skipping apparent function body
1>c:\users\brody\documents\visual studio 2015\projects\eigentest\inc\eigen\core\matrix.h(243): error C2061: syntax error: identifier 'EIGEN_STRONG_INLINE'
1>c:\users\brody\documents\visual studio 2015\projects\eigentest\inc\eigen\core\matrix.h(259): error C2334: unexpected token(s) preceding ':'; skipping apparent function body
1>c:\users\brody\documents\visual studio 2015\projects\eigentest\inc\eigen\core\matrix.h(14): fatal error C1075: the left brace '{' was unmatched at the end of the file

抱怨Matrix.h的第18行:

Which complains about line 18 of Matrix.h:

#ifndef EIGEN_MATRIX_H
#define EIGEN_MATRIX_H

namespace Eigen {

namespace internal {
template<typename _Scalar, int _Rows, int _Cols, int _Options, int _MaxRows, int _MaxCols>
struct traits<Matrix<_Scalar, _Rows, _Cols, _Options, _MaxRows, _MaxCols> > // line 18
{
private:
// etc...

任何其他Eigen #include也会发生类似的问题.我是否错过了一些必需的#include排序或一些编译标志或设置?谢谢！

Similar issues occur with any other Eigen #include. Have I missed some required #include ordering or some compile flag or setting? Thanks!

推荐答案

您必须复制整个Eigen目录，而不仅仅是src子文件夹.而且，您不能直接包含src子文件夹中的文件，而必须将这些文件包含在Eigen目录中.例如，#include <Eigen/Core>将包括所有核心功能，#include <Eigen/Dense>将包括所有密集功能(这包括Core，Geometry和分解).

You must copy the entire Eigen directory not just the src subfolder. And you must not include files from the src subfolder directly, but include the files in the Eigen directory. E.g., #include <Eigen/Core> will include all core functionality, #include <Eigen/Dense> will include all dense functionality (this includes Core, Geometry and the decompositions).

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