main.cpp

#include <iostream>
#include "stu.h"

int main() {
    char* ch = "Call";
    name1::name2::name3::stu::getInstance()->call(10,ch, [=](int num, char* ch){
        printf("num ++ >> %d  char ** > %s",num,ch);
    });
    return 0;
}

stu.cpp

#include "stu.h"
#include <iostream>

namespace name1{
    namespace name2{
        namespace name3{
            static stu* stu1 = NULL;
            stu * stu::getInstance() {
                if(stu1==NULL){
                    stu1 = new stu;
                }
                return stu1;
            }
            void stu::call(int num, const char *ch, const CallBackFunction &call){
                std::cout << "num >> " << num << "char :: > " << ch << std::endl;
            }
        }
    }
}

stu.h

//
// Created by shichimi on 2016/12/05.
//

#ifndef STUDY_STU_H
#define STUDY_STU_H

#include <functional>

namespace name1{
    namespace name2{
        namespace name3{
            class stu {
            public:
                static stu * getInstance();
                typedef std::function<void(int num, char* ch)> CallBackFunction;
                void call(int num, const char *ch, const CallBackFunction &call);
            };
        }
    }
}

#endif //STUDY_STU_H

C++ study

compile:

 c++ -std=c++11 main.cpp stu.cpp -o stu