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I have done it in this way

class Rosinit
{
    static int is_inited = 0;
public:
    Rosinit()
    {
        if(!is_inited){
        int argc=0;
        char** argv =   NULL;

        ros::init(argc,argv,"client_test_stage_ros_synced2");
        is_inited=1;
        }
    }
};


class Rosnode_parent
{

    Rosinit init;
public:
    ros::NodeHandle n;

    Rosnode_parent():init()
    {};
};

the class Rosnode_parent has a memer Rosinit init, in the constructer this member is initializied with with an argumentlist,this is done bevor a NodeHandle Construkter is called.

in class Rosinit the static member "static int is_inited" enusres that there is only on call of ros::init

I use Rosnode_parent as a super calls and inherite , important is that in the childclass in there own constructer the super constructer is called

I have done it in this way

class Rosinit
{
    static int is_inited = 0;
public:
    Rosinit()
Rosinit(int argc, char **argv, const char *node_name)
    {
        if(!is_inited){
        int argc=0;
        char** argv =   NULL;

        ros::init(argc,argv,"client_test_stage_ros_synced2");

        ros::init(argc,argv,node_name);
        is_inited=1;
        }
    }
};


class Rosnode_parent
{

    Rosinit init;
public:
    ros::NodeHandle n;

    Rosnode_parent():init()
    {};
Rosnode_parent(int argc, char **argv, const char *node_name):init(argc, argv, node_name)
    {
       //...
    };
};

the class Rosnode_parent has a memer Rosinit init, in the constructer this member is initializied with with an argumentlist,this is done bevor a NodeHandle Construkter is called.

in class Rosinit the static member "static int is_inited" enusres that there is only on call of ros::init

I use Rosnode_parent as a super calls and inherite , important is that in the childclass in there own constructer the super constructer is called