Why does this not compile? It is matching the documentation and other examples identically. Yet it gives me mismatch errors.

edit

EDIT: I resolved the issue. I apologize I didn't give the full information to be able to solve it. The key missing info was the function wrapper that went around nh.subscribe. nh was defined as const in the function arg and therefore .subscribe cannot be called on a const node handle. This was resolved by adding:

ros::NodeHandle n(nh); so as to create a new node handle from the copied nodehandle passed in. Then, subscribe was eligible to be compiled.

Code which subscribes to topic topicName (from a method inside a class):

gps_sub = nh.subscribe("topicName", 1, &TestClass::testFunction, this);

I've tried putting it inside function definitions in the .cpp and .h files and neither work.

The function callback declaration:

void testFunction(const sensor_msgs::NavSatFix::ConstPtr& msg);

and definition:

void TestClass::testFuntion(const sensor_msgs::NavSatFix::ConstPtr& msg)
{
  UniqueLck lck(buffer_mtx);
  gps_buff.push_back(msg);
  cv.notify_one();
}

What am I missing?

Edit: Adding in compiler error:

test_class.h:426:107: error: no matching function for call to ‘ros::NodeHandle::subscribe(const char [10], int, void (test_class::TestClass::*)(const ConstPtr&), test_class::TestClass*) const’
      gps_sub = nh.subscribe("topicName", 1, &TestClass::testFunction, this);

Edit: Adding the documentation/function it's supposed to match:

http://docs.ros.org/lunar/api/roscpp/...

Which states:

Subscriber ros::NodeHandle::subscribe   (   const std::string &     topic,
uint32_t    queue_size,
void(T::*)(M) const     fp,
T *     obj,
const TransportHints &  transport_hints = TransportHints() 
)

In my above example, I have all of the arguments correct. The topic, the int value, the function pointer, and the "this" pointer to my object (since this is defined within the class).

Really pulling a blank here on why its not compiling.

Edit two: Adding the entire output log, with strings changed to protect confidentiality. (Just find and replace, shouldn't change any code)

In file included from /home/dash/work/company/code/codename/workspace/src/company/test_class/include/test_class/test_class_two.h:23:0,
                 from /home/dash/work/company/code/codename/workspace/src/company/test_class/src/test_class_two.cpp:13:
/home/dash/work/company/code/codename/workspace/src/company/test_class/include/test_class/test_class.h: In member function ‘bool test_class::TestClass::createSubscribers(const ros::NodeHandle&, const ros::NodeHandle&)’:
/home/dash/work/company/code/codename/workspace/src/company/test_class/include/test_class/test_class.h:426:80: error: no matching function for call to ‘ros::NodeHandle::subscribe(std::__cxx11::string, int, void (test_class::TestClass::*)(const ConstPtr&), test_class::TestClass*) const’
     gps_sub = nhp.subscribe(std::string("test"), 1, &TestClass::testFunction, this);
                                                                                ^
In file included from /opt/ros/kinetic/include/ros/ros.h:45:0,
                 from /home/dash/work/company/code/codename/workspace/src/company/test_class/include/test_class/test_class_two.h:18,
                 from /home/dash/work/company/code/codename/workspace/src/company/test_class/src/test_class_two.cpp:13:
/opt/ros/kinetic/include/ros/node_handle.h:402:14: note: candidate: ros::Subscriber ros::NodeHandle::subscribe(const string&, uint32_t, void (T::*)(M), T*, const ros::TransportHints&) [with M = const boost::shared_ptr<const sensor_msgs::NavSatFix_<std::allocator<void> > >&; T = test_class::TestClass; std::__cxx11::string = std::__cxx11::basic_string<char>; uint32_t = unsigned ...