CPP | HalfaGeek

Consider a simple c++ porgram like this below

#include<iostream>

// Base class
class Vehicle {
  public:
    string brand = "Ford";
    void honk() {
      cout << "Tuut, tuut! \n" ;
    }
};

// Derived class
class Car: public Vehicle {
  public:
    string model = "Mustang";
};

int main() {
  Car myCar;
  myCar.honk();
  cout << myCar.brand + " " + myCar.model;
  return 0;
}

This is plain old method C++14,C++17 uses new syntax methods, t get familiarize with those you can use clang-tidy tool.

Install clang-tidy tool

sudo apt-get install clang-tidy

use the below command to get tips on how to modernize the code

clang-tidy --checks='modernize*, readability*' simple.cpp -- -std=c++17

It will give information like this

7173 warnings and 4 errors generated.
Error while processing /home/gharshan/Desktop/simple.cpp.
/home/gharshan/Desktop/simple.cpp:6:5: error: unknown type name 'string'; did you mean 'std::string'? [clang-diagnostic-error]
    string brand = "Ford";
    ^~~~~~
    std::string
/usr/lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/stringfwd.h:79:33: note: 'std::string' declared here
  typedef basic_string<char>    string;   
                                ^
/home/gharshan/Desktop/simple.cpp:7:10: warning: method 'honk' can be made static [readability-convert-member-functions-to-static]
    void honk() {
         ^
    static 
/home/gharshan/Desktop/simple.cpp:8:7: error: use of undeclared identifier 'cout'; did you mean 'std::cout'? [clang-diagnostic-error]
      cout << "Tuut, tuut! \n" ;
      ^~~~
      std::cout
/usr/lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/iostream:61:18: note: 'std::cout' declared here
  extern ostream cout;          /// Linked to standard output
                 ^
/home/gharshan/Desktop/simple.cpp:15:5: error: unknown type name 'string'; did you mean 'std::string'? [clang-diagnostic-error]
    string model = "Mustang";
    ^~~~~~
    std::string
/usr/lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/bits/stringfwd.h:79:33: note: 'std::string' declared here
  typedef basic_string<char>    string;   
                                ^
/home/gharshan/Desktop/simple.cpp:18:5: warning: use a trailing return type for this function [modernize-use-trailing-return-type]
int main() {
~~~ ^
auto       -> int
/home/gharshan/Desktop/simple.cpp:21:3: error: use of undeclared identifier 'cout'; did you mean 'std::cout'? [clang-diagnostic-error]
  cout << myCar.brand + " " + myCar.model;
  ^~~~
  std::cout
/usr/lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/iostream:61:18: note: 'std::cout' declared here
  extern ostream cout;          /// Linked to standard output
                 ^
Suppressed 7171 warnings (7171 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
Found compiler error(s).

HalfaGeek

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