Can constructor with private values produce LNK-Error?

Question

I've started to "port" my Java implementation of dynamic array to C++ and somehow i'm facing a strange linker error (LNK2019 and LNK2011) in my code, although i don't see any place which can produce such error. I think it has something to do with constructor, but i can't find what exactly. Thank you for your help!

DynStackArrayQueue.cpp (test class) :

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

using namespace std;

int main()
{
    DynArray dynA (3, 6);
}

DynArray.h

#pragma once

class DynArray {
private:
    int growthFactor, maxOverhead;
    int elements[];
public:
    DynArray(int growthFactor, int maxOverhead);
}

DynArray.cpp

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

using namespace std;

DynArray::DynArray(int growthFactor, int maxOverhead) {
       this->growthFactor = growthFactor;
       this->maxOverhead = maxOverhead;
    }

The error itself:

LNK-Error

`int elements[];` is not a valid declaration in C++. There is a list of good books [here](https://stackoverflow.com/questions/388242/the-definitive-c-book-guide-and-list); beyond punctuation and the spelling of some keywords, C++ doesn't have much in common with Java. — molbdnilo, Sep 14 '20 at 09:05
@molbdnilo 1. Why? Should i enter some values there first? 2. No, the problem isn't in ```int elements[]```. — Max Azatian, Sep 14 '20 at 09:08
The size of an array is fixed and must be specified at compile-time. — molbdnilo, Sep 14 '20 at 09:09
@MaxAzatian, it may not be the cause of the problem you speak of, but it is definitely *a* problem. — anastaciu, Sep 14 '20 at 09:11
@anastaciu ok, gonna fix it later (if i fix this LNK error). Thank you! — Max Azatian, Sep 14 '20 at 09:12

score 0 · Answer 1 · answered Sep 14 '20 at 09:24

0

You have missed a semicolon at the end of the class declaration. This leads to a compilation error, which you actually should be able to see before the linker error. Solution: add a semicolon after the closing brace of your DynArray class definition.

answered Sep 14 '20 at 09:24

Benjamin Bihler

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Can constructor with private values produce LNK-Error?

1 Answers1