c++ - 在新的 Visual Studio 项目中包含任何 Eigen 3.3.1 文件都不会编译

Question

我在 VS2015 中创建了一个新的 C++(空)项目，然后将 Eigen 3.3.1 源代码放在解决方案目录的“inc”文件夹中，例如 Matrix.h 的路径是 inc/Eigen/Core/。我已将此 inc/ 路径设置为附加包含目录，并且还尝试将 inc/Eigen/ 作为另一个包含目录，以防文件相互包含问题，但这并没有改变什么。

在 main.cpp 中，我有以下内容:

#include "Eigen/Core/Matrix.h"

int main()
{
    return 0;
}

在为 x64 编译时，这给了我:

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

提示 Matrix.h 的第 18 行:

#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 都会出现类似的问题。我错过了一些必需的#include 排序或一些编译标志或设置吗？谢谢!

Answer 1

您必须复制整个 Eigen目录不只是 src子文件夹。并且您不得包含来自 src 的文件子文件夹，但包含 Eigen 中的文件目录。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(这包括核心、几何和分解)。