Initializing class object in C++

Asked Aug 07 '20 at 14:34

Active Aug 07 '20 at 14:34

Viewed 28 times

I'm trying to learn classes in C++ but i'm unable to understand what's happening here.

#include<iostream>
#include<string>

class Dummy{

    public:
        std::string name;
        void setName(std::string input){
            name = input;
        }
};

int main(){
    Dummy obj;
    obj.setName("John");

    Dummy obj1(); // error in this line
    obj1.setName("John");
}

Error:

prog.cpp: In function ‘int main()’:
prog.cpp:18:10: error: request for member ‘setName’ in ‘obj1’, which is of non-class type ‘Dummy()’
   18 |     obj1.setName("John");
      |          ^~~~~~~

asked Aug 07 '20 at 14:34

TheScore

1

`Dummy obj1();` is a vexing parse. It's a function declaration, not an object. Do `Dummy obj1{};` instead. – cigien Aug 07 '20 at 14:35
Im very new to coding and C++ please can you explain me in detail or link to a resourse would be great help @cigien – TheScore Aug 07 '20 at 14:36
Linked to a dupe. That should address the question. – cigien Aug 07 '20 at 14:37
@cigien Thank you... I couldn't search it did not know what to search. – TheScore Aug 07 '20 at 14:39
Yes, it's definitely not easy to search for something like this if you don't know what's going on :) – cigien Aug 07 '20 at 14:40
@cigien Understood why the error occurred but `Dummy obj1{};` works what's happening there. – TheScore Aug 07 '20 at 14:44
3

That syntax unambiguously defines an object of type `Dummy`, which is what you want. – cigien Aug 07 '20 at 14:44
@cigien Thank you learnt something new and i found `{}` about this in cplusplus.com under uniform initialization. – TheScore Aug 07 '20 at 14:54

Initializing class object in C++

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