static const data members definition

[margareto]

Hi you all,

I would like to know what is the best way for make the definition of the static const data members.

I would like to have two files:
- InputError.h
- InputError.cpp

I woule like to make the declaration of the class in .h and the definition in .cpp. Is this correct?

I have the following:
File InputError.h:

#pragma once

#define INPUT_ERRORS

class InputError 
{
public:
	static const int NumberZero;
	static const int NumberOne;
	static const int NumberTwo;
	static const int NumberThree;
	static const int NumberFour;
	static const int NumberFive;
}

File InputError.cpp:

#include "InputError.h"


static const int InputError::NumberZero=0;
static const int InputError::NumberOne=1;
static const int InputError::NumberTwo=2;
static const int InputError::NumberThree=3;
static const int InputError::NumberFour=4;
static const int InputError::NumberFive=5;

Compiler fails, and I don't know if it is the "polite" way.
I want to use this class for making something like that in other part of the code:

if (condition) return InputError::NumberZero;

Any other idea is very welcome as well as tips!

Thanks in advance,

Pablo

[hamsterman]

You don't need to write 'static' in your cpp.

[helios]

static const int members can (not sure if they must) be initialized in the class declaration.

[bscarso]

@margareto
Like helios said the static const members can be inicialized in the class declaration.
Example:

//X.h
#ifndef X_H_INCLUDED
#define X_H_INCLUDED
class X {
    public:
        X::X(){}
        X::~X(){}
        static const int x = 10;
};

#endif // X_H_INCLUDED  

//main.cpp
#include <iostream>
#include <limits>
#include "X.h"

using namespace std;
int main()
{
    X objectX;
    cout << objectX.x;
    cin.ignore(numeric_limits<streamsize>::max(),'\n');
    return 0;
}

I hope this help you.

[margareto]

Thanks a lot! I did it just in a file. I hope it be "polite" anyway, since it is for my Ms Thesis and they want like that!

Thanks to all of you!

Pablo