I have a class which is going to handle an array of objects of another class I've created earlier (which works fine). The problem appears when I try to create an object of my List-class.
This is the header of the list-class:
#ifndef personlistH
#define personlistH
#include "Person.h"
#include <iomanip>
#include <iostream>
#define SIZE 10
namespace std {
class PersonList {
private:
Person persons[SIZE];
int arrnum;
string filename;
public:
Personlist();
};
}
#endif
This is the main function:
#include <iostream>
#include "PersonList.h"
using namespace std;
int main() {
PersonList personlist;
return 0;
}
The error my compiler is giving me is the following:
error: "27 \\PersonList.h ISO C++ forbids declaration of `Personlist' with no type"
I've searched for answers but as I'm quite new to C++ it's been a bit confusing and I haven't found any fitting yet. It would be great if you could explain this error for me.
You have the wrong capitalisation on your constructor declaration. You have Personlist();
but need PersonList();
. Because what you have isn't equal to the class name it is considered a function rather than a constructor, and a function needs a return type.
Do not add your own types to the standard namespace( std
), instead create your own namespace and define your class inside it.
//PersonList.h
namespace PersonNamespace
{
class PersonList
{
//members here
};
}
//Main.cpp
using namespace PersonNamespace;
The actual error is that you made a typo in Personlist
instead of PersonList
The error is because you got the capitalisation wrong when you declared the constructor; it should be PersonList()
not Personlist()
.
Also, you should never declare your own classes in the std
namespace; that's reserved for the standard library. You shoud make up your own namespace name, and put your things in that.
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