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 add_service_files(
   FILES
   ServiceName.srv
 )
...
find_package(catkin REQUIRED COMPONENTS
  roscpp
  message_generation
)

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float64 radius 
int32 repetitions 
--- 
bool success

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#include <ros/package.h>
trajectory.request.file = ros::package::getPath("packagename") + "/path_to/file.txt";

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find_package(catkin REQUIRED COMPONENTS  roscpp roslib)

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find_package(catkin REQUIRED COMPONENTS
       roscpp
       std_msgs
       message_generation   # Add message_generation here, after the other packages
)

#Add to message files
add_message_files(
      FILES

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<build_depend>message_generation</build_depend> 
<run_depend>message_runtime</run_depend>

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import cv2
import numpy as np
img = cv2.imread('images/input.jpg')
gray=cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)

rows,cols = img.shape[:2]



cv2.imshow('Original',img)

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class A{
   int  d_val;
 public:
   A(int val){
       d_val=val;
   }
};

int main(){
  A * a=new A(5);

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class A{
   int  d_val;
 public:
   A(int val){
       d_val=val;
   }
};

int main(){
  A a=A(5);

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class A{
 public:
   int  d_val;
};

int main(){
  A a=A();
  a.val=5;
  return 0;
}