Question

// I can't get my cpp file to work with my header file and it always says the error comes from compatibility I am using Visual Studio 2015 below is the error only my file path and program name has been erased. The issue comes up in my cpp file with the size_t empty and full functions.

// Error (active)       declaration is incompatible with "bool ListType::empty()" (declared at line 12 of ListType.h)        

// ListType header file

#ifndef ListType__h
#define ListType__h
#include
class ListType {
public:
   ListType();
   bool insert(int value);
   void eraseAll();
   void erase(int);
   bool find(int );
   size_t size();
   bool empty();
   bool full();
   const ListType & operator = (const ListType &other);
   friend std :: ostream & operator << (std :: ostream &out, const ListType &list);
protected:
   int list[100];
   size_t capacity;
   size_t count;
private:
};
#endif /* ListType__h */

//my cpp file

#include "ListType.h"
#include

ListType::ListType() {
   capacity = 100;
   count = 0;
}

bool ListType::insert(int value)
{
   bool result = false;
   if (!full()) {
       list[count] = value;
       ++count;
       result = true;

   }
   return result;
}

void ListType::eraseAll() {
   count = 0;
}
void ListType::erase(int value) {
   size_t i = 0;
   while (i < count&&value != list[i])++i;
   if (i < count) {
       list[i] = list[--count];
   }

}

bool ListType::find(int value) {
   bool result = false;
   if (!empty()) {
       size_t i = 0;
       while (i        result = (i    }
   return result;
}

size_t ListType::size() {
   return count;
}
size_t ListType::empty() {
   return count = 0;
}
size_t ListType::full() {
   return count == capacity;
}

const ListType& ListType:: operator=(const ListType& source) {
   if (this != &source) {
       count = source.count;
       for (size_t i = 0; i            list[i] = source.list[i];
       }
   }
   return *this;
}
std::ostream& operator<<(std::ostream &out, const ListType &other)

{

   out << "[ ";

   for (unsigned int i = 0;i

   {

       out << other.list[i] << " ";

   }

   out << "]";

   return out;

}

Answer 1

If you have any doubts, please give me comment...

ListType.h

// ListType header file

#ifndef ListType__h

#define ListType__h

#include<iostream>

class ListType

{

public:

    ListType();

    bool insert(int value);

    void eraseAll();

    void erase(int);

    bool find(int);

    size_t size();

    bool empty();

    bool full();

    const ListType &operator=(const ListType &other);

    friend std ::ostream &operator<<(std ::ostream &out, const ListType &list);

protected:

    int list[100];

    size_t capacity;

    size_t count;

private:

};

#endif /* ListType__h */

ListType.cpp

#include "ListType.h"

#include <iostream>

ListType::ListType()

{

    capacity = 100;

    count = 0;

}

bool ListType::insert(int value)

{

    bool result = false;

    if (!full())

    {

        list[count] = value;

        ++count;

        result = true;

    }

    return result;

}

void ListType::eraseAll()

{

    count = 0;

}

void ListType::erase(int value)

{

    size_t i = 0;

    while (i < count && value != list[i])

        ++i;

    if (i < count)

    {

        list[i] = list[--count];

    }

}

bool ListType::find(int value)

{

    bool result = false;

    if (!empty())

    {

        size_t i = 0;

        while (i < count)

        {

            if (list[i] == value)

                result = true;

            i++;

        }

    }

    return result;

}

size_t ListType::size()

{

    return count;

}

bool ListType::empty()

{

    return count == 0;

}

bool ListType::full()

{

    return count == capacity;

}

const ListType &ListType::operator=(const ListType &source)

{

    if (this != &source)

    {

        count = source.count;

        for (size_t i = 0; i < count; i++)

        {

            list[i] = source.list[i];

        }

    }

    return *this;

}

std::ostream &operator<<(std::ostream &out, const ListType &other)

{

    out << "[ ";

    for (unsigned int i = 0; i < other.count; i++)

    {

        out << other.list[i] << " ";

    }

    out << "]";

    return out;

}

The errors returned because of return datatype doesn't matched .cpp with .h file.. Here I modified everything it works fine...