变量“qglviewer：：QGLVIEWER_EXPORT qglviewer：：Constraint”具有初始值设定项，但类型不完整

Question

我想从.off文件中对被视为Linear_cell_complex_for_bgl_combinatorial_map_helper的3d对象应用QGLViewer multiselect

我在GitHub here上的项目

它显示了有关使用GLViewer/constraint.h的错误，如下所示：

/usr/include/QGLViewer/constraint.h:117:24: error: variable ‘qglviewer::QGLVIEWER_EXPORT qglviewer::Constraint’ has initializer but incomplete type
 class QGLVIEWER_EXPORT Constraint
                        ^~~~~~~~~~
/usr/include/QGLViewer/constraint.h:119:1: error: expected primary-expression before ‘public’
 public:
 ^~~~~~
/usr/include/QGLViewer/constraint.h:119:1: error: expected ‘}’ before ‘public’
/usr/include/QGLViewer/constraint.h:118:1: note: to match this ‘{’
 {
 ^
/usr/include/QGLViewer/constraint.h:119:1: error: expected ‘,’ or ‘;’ before ‘public’
 public:
 ^~~~~~
/usr/include/QGLViewer/constraint.h:133:2: error: ‘virtual’ outside class declaration
  virtual void constrainTranslation(Vec& translation, Frame* const frame) { Q_UNUSED(translation); Q_UNUSED(frame); }
  ^~~~~~~
/usr/include/QGLViewer/constraint.h:133:36: error: variable or field ‘constrainTranslation’ declared void
  virtual void constrainTranslation(Vec& translation, Frame* const frame) { Q_UNUSED(translation); Q_UNUSED(frame); }
                                    ^~~
/usr/include/QGLViewer/constraint.h:133:36: error: ‘Vec’ was not declared in this scope
/usr/include/QGLViewer/constraint.h:133:36: note: suggested alternative:
In file included from /usr/local/include/CGAL/Qt/qglviewer.h:26,
                 from /usr/local/include/CGAL/Qt/Basic_viewer_qt.h:40,
                 from /usr/local/include/CGAL/draw_linear_cell_complex.h:24,
                 from ../Projects/CM2/mainwindow.h:13,
                 from ../Projects/CM2/main.cpp:2:
/usr/local/include/CGAL/Qt/vec.h:64:22: note:   ‘CGAL::qglviewer::Vec’
 class CGAL_QT_EXPORT Vec {
                      ^~~
In file included from ../Projects/CM2/manipulatedframesetconstraint.h:3,
                 from ../Projects/CM2/mainwindow.h:36,
                 from ../Projects/CM2/main.cpp:2:
/usr/include/QGLViewer/constraint.h:133:41: error: ‘translation’ was not declared in this scope
  virtual void constrainTranslation(Vec& translation, Frame* const frame) { Q_UNUSED(translation); Q_UNUSED(frame); }
                                         ^~~~~~~~~~~
/usr/include/QGLViewer/constraint.h:133:41: note: suggested alternative: ‘QTranslator’
  virtual void constrainTranslation(Vec& translation, Frame* const frame) { Q_UNUSED(translation); Q_UNUSED(frame); }
                                         ^~~~~~~~~~~
                                         QTranslator
/usr/include/QGLViewer/constraint.h:133:59: error: expected primary-expression before ‘*’ token
  virtual void constrainTranslation(Vec& translation, Frame* const frame) { Q_UNUSED(translation); Q_UNUSED(frame); }
                                                           ^
/usr/include/QGLViewer/constraint.h:133:61: error: expected primary-expression before ‘const’
  virtual void constrainTranslation(Vec& translation, Frame* const frame) { Q_UNUSED(translation); Q_UNUSED(frame); }
                                                             ^~~~~
/usr/include/QGLViewer/constraint.h:142:2: error: ‘virtual’ outside class declaration
  virtual void constrainRotation(Quaternion& rotation, Frame* const frame) { Q_UNUSED(rotation); Q_UNUSED(frame); }
  ^~~~~~~
/usr/include/QGLViewer/constraint.h:142:33: error: variable or field ‘constrainRotation’ declared void
  virtual void constrainRotation(Quaternion& rotation, Frame* const frame) { Q_UNUSED(rotation); Q_UNUSED(frame); }
                                 ^~~~~~~~~~
/usr/include/QGLViewer/constraint.h:142:33: error: ‘Quaternion’ was not declared in this scope
/usr/include/QGLViewer/constraint.h:142:33: note: suggested alternative:
In file included from /usr/local/include/CGAL/Qt/camera.h:27,
                 from /usr/local/include/CGAL/Qt/qglviewer.h:27,
                 from /usr/local/include/CGAL/Qt/Basic_viewer_qt.h:40,
                 from /usr/local/include/CGAL/draw_linear_cell_complex.h:24,
                 from ../Projects/CM2/mainwindow.h:13,
                 from ../Projects/CM2/main.cpp:2:
/usr/local/include/CGAL/Qt/quaternion.h:69:22: note:   ‘CGAL::qglviewer::Quaternion’
 class CGAL_QT_EXPORT Quaternion {
                      ^~~~~~~~~~
In file included from ../Projects/CM2/manipulatedframesetconstraint.h:3,
                 from ../Projects/CM2/mainwindow.h:36,
                 from ../Projects/CM2/main.cpp:2:
/usr/include/QGLViewer/constraint.h:142:45: error: ‘rotation’ was not declared in this scope
  virtual void constrainRotation(Quaternion& rotation, Frame* const frame) { Q_UNUSED(rotation); Q_UNUSED(frame); }
                                             ^~~~~~~~
/usr/include/QGLViewer/constraint.h:142:45: note: suggested alternative: ‘QAction’
  virtual void constrainRotation(Quaternion& rotation, Frame* const frame) { Q_UNUSED(rotation); Q_UNUSED(frame); }
                                             ^~~~~~~~
                                             QAction
/usr/include/QGLViewer/constraint.h:142:60: error: expected primary-expression before ‘*’ token
  virtual void constrainRotation(Quaternion& rotation, Frame* const frame) { Q_UNUSED(rotation); Q_UNUSED(frame); }
                                                            ^
/usr/include/QGLViewer/constraint.h:142:62: error: expected primary-expression before ‘const’
  virtual void constrainRotation(Quaternion& rotation, Frame* const frame) { Q_UNUSED(rotation); Q_UNUSED(frame); }
                                                              ^~~~~
/usr/include/QGLViewer/constraint.h:168:44: error: expected initializer before ‘:’ token
 class QGLVIEWER_EXPORT AxisPlaneConstraint : public Constraint
                                            ^
/usr/include/QGLViewer/constraint.h:279:40: error: expected initializer before ‘:’ token
 class QGLVIEWER_EXPORT LocalConstraint : public AxisPlaneConstraint
                                        ^
/usr/include/QGLViewer/constraint.h:299:40: error: expected initializer before ‘:’ token
 class QGLVIEWER_EXPORT WorldConstraint : public AxisPlaneConstraint
                                        ^
/usr/include/QGLViewer/constraint.h:319:41: error: expected initializer before ‘:’ token
 class QGLVIEWER_EXPORT CameraConstraint : public AxisPlaneConstraint
                                         ^
/usr/include/QGLViewer/constraint.h:336:1: error: expected declaration before ‘}’ token
 } // namespace qglviewer
 ^

所有的错误都显示在Constraint.h中，它已经在QGLViewer中了，所以我不知道问题出在哪里。

感谢您的帮助，谢谢

Answer 1

总结解决方案:使用来自/usr/local/include/CGAL/Qt/QGLViewer而不是来自/usr/local/include/QGLViewer的包含文件

在您的代码中，使用名称空间为CGAL::qglviewer::的类型，而不仅仅是qglviewer::