)我有一个问题很容易解决,但我在c++中找不到正确的形式主义。我想在给定头文件中声明另一个类的对象。不幸的是,我得到了这个错误:
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他显然不喜欢声明stiff_nonl stiffness_nonl;?它是否与stiff_nonl类从其他类继承的操作有关?我必须在声明中考虑这一点吗?
希望某个c++跳棋能帮到我?
首先要感谢大家!
干杯Franz
发布于 2016-10-20 17:42:23
stiff_nonl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
{
//...
}另外,我相信你想在这里公开继承:
class new_raphs : public set_force发布于 2016-10-20 20:30:51
哇,谢谢!现在它可以工作了:)
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,为什么是对象名(stiffness_nonl)而不是类或构造函数名(Stiff_nonl)?这对我来说有点奇怪。
干杯Franz
https://stackoverflow.com/questions/40150347
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