Error: "className" is not a nonstatic data member or base class of class "className"

Question

I am trying to make an explicit constructor that calls the default constructor, but it says that i don't have one.

class Paddle{
private:

    int x, y;
    int startX, startY;

public:

    Paddle(){
        x = y = 0;
    }

    Paddle(int posX, int posY) : Paddle(){  // <-- the error is on ": Paddle()"
        startX = posX;
        startY = posY;
        x = posX;
        y = posY;
    }
};

What exactly causes this to happen, and how can i fix it? Thanks in advance!

read this one this will help you http://stackoverflow.com/questions/308276/call-constructor-from-constructor-in-c its only supported in c++11 up — Lorence Hernandez, Nov 24 '16 at 14:58
I use Visual Studio 2012. It should be working with c++11 code, as far as i know. — Georgi Enev, Nov 24 '16 at 14:59

Fitzwilliam Bennet-Darcy · Accepted Answer · 2016-11-24T15:04:00.043

7

This is the correct syntax, but constructor delegation is not supported until C++11.

Visual Studio 2012 does not purport to implement the C++11 standard. Constructor delegation is one of those things that is doesn't support.

edited Nov 24 '16 at 15:04

answered Nov 24 '16 at 14:54

Fitzwilliam Bennet-Darcy

1,332
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That's... not an answer, really – StoryTeller - Unslander Monica Nov 24 '16 at 14:55
I don't understand the reason why it wouldn't be considered to be an answer. The code is correct C++11, so the only thing it can be is the compiler. – Fitzwilliam Bennet-Darcy Nov 24 '16 at 14:55
1

Because the resolution is not self contained "Do check your compiler documentation." is not an answer, it's a comment at best. – StoryTeller - Unslander Monica Nov 24 '16 at 14:56
The OP has helped me refine this answer. Hopefully it is better received now. – Fitzwilliam Bennet-Darcy Nov 24 '16 at 15:04
1

@StoryTeller, from your bio on this site: "I don't believe in answering questions completely. IMHO, one gains the most when one deduces as much of the answer on their own." :-P – Jonathan Wakely Nov 24 '16 at 15:04
@JonathanWakely, I try to walk the fine line of not giving too much, while not giving too little :) – StoryTeller - Unslander Monica Nov 24 '16 at 15:05
1

@StoryTeller, Which, having looked at some of your excellent answers, you do with aplomb! – Fitzwilliam Bennet-Darcy Nov 24 '16 at 15:05
Thank you! Sorry, i forgot to mention my compiler version. – Georgi Enev Nov 24 '16 at 15:10

score 2 · Answer 2 · answered Nov 24 '16 at 15:01

2

You mentioned you use visual studio 2012. Unfortunately it doesn't support delegating constructors. You can see a table of supported features by version at msdn.

https://msdn.microsoft.com/en-us/library/hh567368.aspx

answered Nov 24 '16 at 15:01

StoryTeller - Unslander Monica

165,132
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k-messaoudi · Answer 3 · 2017-05-17T08:08:25.210

C++ don't allow a constructor to call other constructors definition of the same class at the initialization level.

When you write Paddle(int posX, int posY) : Paddle() ... the compiler understands Paddle is a super class of Paddle or a member of Paddle which is not the case. All what you need is a default parameters like this:

class Paddle{
private:

    int x, y;
    int startX, startY;

public:
    Paddle(int posX=0, int posY=0):x(posX),y(posY),startX(posX),startY(posY) {}
};

score -1 · Answer 4 · answered Nov 24 '16 at 15:42

-1

this is allowed in C++11 see Object construction

answered Nov 24 '16 at 15:42

k-messaoudi

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Error: "className" is not a nonstatic data member or base class of class "className"

4 Answers4