1>e:\程序\c++\tbar_foo\tbar_foo\Bar_Foo.h(20) : error C2059: 语法错误 : “常量”

#include<iostream>
using namespace std;
class Foo
{
public:
    Foo(int f)
    {  fooval=f;  }
    int GetVal()
    {
        return fooval;
    }
private:
    int fooval;
    friend class Bar;
};
class Bar
{
private:
    //static  int barval;
    static Foo foo(5);
    int callsFooVal;
public:
    Bar()
    {
        callsFooVal=0;
    }
    
};


1>e:\程序\c++\tbar_foo\tbar_foo\Bar_Foo.h(20) : error C2059: 语法错误 : “常量”

不知道错哪里了    哪位高手指点一下