C++ Friend Functions in separate header and .cpp files

Question

//A.h
class A{
friend bool compareEntry_sumPct_nonMega(Entry arg1, Entry arg2);
}

//A.cpp
#include "A.h"
bool A::compareEntry_sumPct_nonMega(Entry arg1, Entry arg2)
{
    bool b = arg1.sumOfNonMegaEntryPct(numbers) < arg2.sumOfNonMegaEntryPct(numbers);
    return b;
}

I get the error compareEntry_sum_Pct_nonMega is not a member of A.

Answer 1

//A.h
class A{
friend bool compareEntry_sumPct_nonMega(A& obj, Entry arg1, Entry arg2); <-- CHANGE done here
}

//A.cpp
#include "A.h"
bool compareEntry_sumPct_nonMega(A& obj, Entry arg1, Entry arg2) <-- CHANGE done here
{
    // Using 'obj', all members (private as well) of class A can be accessed <-- CHANGE done here
    bool b = arg1.sumOfNonMegaEntryPct(numbers) < arg2.sumOfNonMegaEntryPct(numbers);
    return b;
}