implement a static method of a class

Question

I have a header:

class a
{
 public:
  a();
  static int Zero();
  void SimpleEx();
}

and its cpp file:

a() { }
static int a::Zero() {return 0;}
void SimpleEx() { cout << a::Zero(); }

I get the error when compiling:

Error 1 error LNK2019: unresolved external symbol "public: static class a __cdecl a::Zero(void)" (?Zero@a@@SA?AV1@XZ) referenced in function "public: class a __thiscall a::SimpleEx(void)" (?SimpleEx@a@@QAE?AV1@XZ)

How to solve this?

try not using the static keyword

smac89
– smac89

2014-10-16 22:07:56 +00:00
Commented Oct 16, 2014 at 22:07 — smac89
– smac89, Commented Oct 16, 2014 at 22:07

Ian · Accepted Answer · 2014-10-16 22:14:11Z

1

Take "static" out of the definition:

Declaration:

class a
{
    static int Zero();
}

Definition:

int a::Zero()
{
    return 0;
}

edited Oct 16, 2014 at 22:14

answered Oct 16, 2014 at 22:08

Ian

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2 Comments

Aaron Azhari Over a year ago

This solved the problem. But why can't I use static?

Ian Over a year ago

It's enough to declare the function as static. The same reason you don't need to specify the access type in the definition again - you say it's "public" in the header, for example, it's enough.

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