另一个头文件中对象的声明

Declaration of an object in another header file

本文关键字:声明 对象 文件 另一个      更新时间:2023-10-16

(我有一个问题可以很简单地解决,但我在c++中找不到正确的形式主义。我想将另一个类的对象声明为给定的头文件。不幸的是,我得到了错误:

cc1plus: warning: command line option ‘-Wstrict-prototypes’ is valid for     C/ObjC but not for C++ [enabled by default]
calc/solver_nonl/new_raphs.cpp: In constructor
‘new_raphs::new_raphs(Eigen::MatrixXd, Eigen::MatrixXd, Eigen::MatrixXd, Eigen::MatrixXd, Eigen::MatrixXd)’:
calc/solver_nonl/new_raphs.cpp:7:44: error: no matching function for call to ‘stiff_nonl::stiff_nonl()’
:set_force(node_matrix,dof_matrix_input)
^
calc/solver_nonl/new_raphs.cpp:7:44: note: candidates are:
In file included from calc/solver_nonl/new_raphs.h:8:0,
from calc/solver_nonl/new_raphs.cpp:1:
calc/solver_nonl/../fem_nonl/stiff_nonl.h:20:5: note: stiff_nonl::stiff_nonl(Eigen::MatrixXd, Eigen::MatrixXd, Eigen::MatrixXd, Eigen::MatrixXd)
stiff_nonl(MatrixXd node_matrix, MatrixXd dof_matrix_input, MatrixXd element_matrix, MatrixXd element_info_matrix);
^
calc/solver_nonl/../fem_nonl/stiff_nonl.h:20:5: note:   candidate expects 4 arguments, 0 provided
calc/solver_nonl/../fem_nonl/stiff_nonl.h:17:7: note: 
stiff_nonl::stiff_nonl(const stiff_nonl&)
class stiff_nonl : public set_force
^
calc/solver_nonl/../fem_nonl/stiff_nonl.h:17:7: note:   candidate expects 1 argument, 0 provided
calc/solver_nonl/new_raphs.cpp: In member function ‘Eigen::MatrixXd& new_raphs::get_epsilon_results(int, int)’:
calc/solver_nonl/new_raphs.cpp:92:1: warning: no return statement in function returning non-void [-Wreturn-type]
}
^
error: command 'x86_64-linux-gnu-gcc' failed with exit status 1
make: *** [all] Fehler 1

我以前经常声明不同类的对象,但我在这里做错了什么?

头文件如下所示:

#ifndef NEW_RAPHS_H
#define NEW_RAPHS_H
# include "../../pre/boundary_force/set_force.h"
# include <iostream>
#include "../fem_lin/stiff.h"
#include "../fem_nonl/stiff_nonl.h"
using namespace std;
class new_raphs : set_force
{
public:
new_raphs(MatrixXd node_matrix, MatrixXd dof_matrix_input, MatrixXd element_matrix, MatrixXd element_info_matrix, MatrixXd force_matrix_input);
MatrixXd elements;
MatrixXd elements_info;
MatrixXd force_matrix;
void calc();
VectorXd U;
MatrixXd res;
MatrixXd result_matrix;
MatrixXd &get_result();
stiff_nonl stiffness_nonl;   // here is the bug!
MatrixXd &get_epsilon_results(int noe, int num_gauss_point);
};
#endif // NEW_RAPHS_H

他显然不喜欢这个宣言???stiff_noll类从另一个类继承是否与此有关????我必须在声明中考虑这一点吗?

希望有一个c++检查器能在这里帮我?

非常感谢!

Franz 干杯

stiff_noll没有默认构造函数。您可以在new_raphs构造函数初始化列表中传递正确的参数,例如:

new_raphs::new_raphs(MatrixXd node_matrix, MatrixXd dof_matrix_input, MatrixXd element_matrix, MatrixXd element_info_matrix, MatrixXd force_matrix_input)
    : stiffness_nonl() //pass arguments to stiff_nonl constr. inside brackets
{
    //...
}

此外,我相信你想要这里的公共继承:

class new_raphs : public set_force

哇,谢谢!现在它工作了:(

正确的构造函数是:

new_raphs::new_raphs(MatrixXd node_matrix, MatrixXd dof_matrix_input, MatrixXd element_matrix, MatrixXd element_info_matrix, MatrixXd force_matrix_input)
:set_force(node_matrix,dof_matrix_input), stiffness_nonl(node_matrix, dof_matrix_input, element_matrix, element_info_matrix)

我仍然有点困惑,为什么对象名称(stiffness_nonl(而不是类或构造函数名称(stif_noll(???这对我来说有点奇怪…

Franz 干杯