Linker error with static const field

[Martin Magnusson]

Hi

I have a class with a public const static variable, and I get a number
of undefined references to it when linking. The code looks like below.
When referencing the variable from other files I use
MaxNode::NO_ARGUMENT. Am I missing something in the definition here,
or would it seem that the problem lies elsewhere?

//MaxNode.hpp:///////////////////
class MaxNode
{
public:
const static double NO_ARGUMENT;
// (etc...)
};

//MaxNode.cpp:////////////////////
#include "MaxNode.hpp"
const static double NO_ARGUMENT = 1123;
// (etc...)

 

[red floyd]

Hi

I have a class with a public const static variable, and I get a number
of undefined references to it when linking. The code looks like below.
When referencing the variable from other files I use
MaxNode::NO_ARGUMENT. Am I missing something in the definition here,
or would it seem that the problem lies elsewhere?

//MaxNode.hpp:///////////////////
class MaxNode
{
public:
const static double NO_ARGUMENT;
// (etc...)
};

//MaxNode.cpp:////////////////////
#include "MaxNode.hpp"
const static double NO_ARGUMENT = 1123;
// (etc...)

const double MaxNode::NO_ARGUMENT = 1123;

 

[Ron Natalie]

Hi

#include "MaxNode.hpp"
const static double NO_ARGUMENT = 1123;

You have just declared a non-class variable called NO_ARGUMENT.
You want:
const double MaxNode::NO_ARGUMENT = 1123;