The document describes compile errors occurring in a C++ project for managing a music playlist. There are errors in the Playlist.cpp file related to using the std::list iterator and calling member functions on it. The code is provided for the Main.cpp, Playlist.cpp and Playlist.h files that define the playlist classes and functions. A modified version of the code is also provided that fixes the iterator issues.

1. I am having the below compile errors.
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1>------ Build started: Project: playlist, Configuration: Debug Win32 ------
1> Playlist.cpp
1>c:users rgdocumentsvisual studio 2015projectsplaylistplaylistplaylist.cpp(74): error
C3867: 'std::list>::size': non-standard syntax; use '&' to create a pointer to member
1> with
1> [
1> _Ty=Playlist
1> ]
1>c:users rgdocumentsvisual studio 2015projectsplaylistplaylistplaylist.cpp(74): error
C2296: '>': illegal, left operand has type 'unsigned int (__thiscall std::list>::* )(void) noexcept
const'
1> with
1> [
1> _Ty=Playlist
1> ]
1>c:users rgdocumentsvisual studio 2015projectsplaylistplaylistplaylist.cpp(74): error
C2297: '>': illegal, right operand has type 'unsigned int (__thiscall std::list>::* )(void) noexcept
const'
1> with
1> [
1> _Ty=Playlist
1> ]
1>c:users rgdocumentsvisual studio 2015projectsplaylistplaylistplaylist.cpp(76): error
C2065: 'it': undeclared identifier
1>c:users rgdocumentsvisual studio 2015projectsplaylistplaylistplaylist.cpp(78): error
C2065: 'it': undeclared identifier
1>c:users rgdocumentsvisual studio 2015projectsplaylistplaylistplaylist.cpp(78): error
C2227: left of '->GetID' must point to class/struct/union/generic type
1> c:users rgdocumentsvisual studio 2015projectsplaylistplaylistplaylist.cpp(78): note:
type is 'unknown-type'
1>c:users rgdocumentsvisual studio 2015projectsplaylistplaylistplaylist.cpp(80): error
C2065: 'it': undeclared identifier

2. 1>c:users rgdocumentsvisual studio 2015projectsplaylistplaylistplaylist.cpp(80): error
C2227: left of '->GetSongName' must point to class/struct/union/generic type
1> c:users rgdocumentsvisual studio 2015projectsplaylistplaylistplaylist.cpp(80): note:
type is 'unknown-type'
1>c:users rgdocumentsvisual studio 2015projectsplaylistplaylistplaylist.cpp(81): error
C2065: 'it': undeclared identifier
1>c:users rgdocumentsvisual studio 2015projectsplaylistplaylistplaylist.cpp(144):
error C3867: 'std::list>::size': non-standard syntax; use '&' to create a pointer to member
1> with
1> [
1> _Ty=Playlist
1> ]
1>c:users rgdocumentsvisual studio 2015projectsplaylistplaylistplaylist.cpp(144):
error C2446: '<=': no conversion from 'unsigned int (__thiscall std::list>::* )(void) noexcept
const' to 'int'
1> with
1> [
1> _Ty=Playlist
1> ]
1> c:users rgdocumentsvisual studio 2015projectsplaylistplaylistplaylist.cpp(144):
note: There is no context in which this conversion is possible
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
****************************************************************
I have three files:
Main.cpp
#include
#include "Playlist.h"
using namespace std;
int main()
{
int choice;
string uqid = "";
string songnam = "";
string artname;
int len;
PlaylistNode PlaylistNode;

3. do
{
cout << "MENU" << endl;
cout << "a - Add song: " << endl;
cout << "d - Remove song: " << endl;
cout << "c - Change position of song " << endl;
cout << "s - Output songs by specific artist: " << endl;
cout << "t - Output total time of playlist (in seconds): " << endl;
cout << "o - Output full playlist " << endl;
cout << "q - QUIT PROGRAM " << endl;
cout << "Please enter your selection." << endl;
cin >> choice;
switch (choice)
{
case 'a':
{
cout << "ADD SONG" << endl;
cout << "Enter song's unique ID:" << endl;
cin >> uqid;
cout << "Enter song's name:" << endl;
cin >> songnam;
cout << "Enter artist's name:" << endl;
cin >> artname;
cout << "Enter Song len" << endl;
cin >> len;
Playlist playlistobj(uqid, songnam, artname, len);
PlaylistNode.Addsong(playlistobj);
break; //Add record
}
case 'd':
{
cout << "REMOVE SONG" << endl;
cout << "Enter song's unique ID:" << endl;
cin >> uqid;
PlaylistNode.Removesong(uqid);

4. }
break; //Display record
case 'c':
{
int Creentpos = 0;
int newpos = 0;
cout << "Enter song's current position:" << endl;
cin >> Creentpos;
cout << "Enter new position for song:" << endl;
cin >> newpos;
PlaylistNode.Changeposition(Creentpos, newpos);
}
case 's':
cout << "Enter artist's name:" << endl;
cin >> artname;
PlaylistNode.PrintSongByartist(artname);
break; //EDit record
case 't':
PlaylistNode.PrintSongtotalLen();
break; //EDit record
case 'o':
PlaylistNode.PrintFullPlayList();
break; //EDit record
case 'q':
cout << "QUIT PROGTRAM--" << endl;
break;
default: cout << "Invalid Selection" << endl;
}
} while
(choice == 'q');
system("PAUSE");
return 0;
}
Playlist.cpp
#include "Playlist.h"

5. Playlist::Playlist(string auniqueId, string asongName, string aArtistName, int aSongLength)
{
uniqueID = auniqueId;
songName = asongName;
artistName = aArtistName;
songLength = aSongLength;
}
string Playlist::GetArtistName()
{
return artistName;
}
string Playlist::GetID()
{
return uniqueID;
}
string Playlist::GetSongName()
{
return songName;
}
int Playlist::GetSongLength()
{
return songLength;
}
void Playlist::SetNext()
{
}
string Playlist::GetNext()
{
return "";
}
void Playlist::InsertAfter() {
}

6. void Playlist::PrintPlaylistNode()
{
cout << "Unique ID:" << uniqueID << endl;
cout << "Song Name:" << songName << endl;
cout << "Artist Name:" << artistName << endl;
cout << "Song Length (in seconds):" << songLength << endl;
}
////
void PlaylistNode::Addsong(Playlist aPlaylist)
{
library.push_back(aPlaylist);
}
void PlaylistNode::Removesong(string aUnwiid)
{
if (library.size > 0)
{
for (it = library.begin(); it != library.end(); ++it)
{
if (it->GetID() == aUnwiid)
{
cout << it->GetSongName() << endl;
library.remove(*it);
break;
}
}
}
}
Playlist PlaylistNode::get(list _list, int _i) {
list::iterator it = _list.begin();
for (int i = 0; i<_i; i++) {
++it;
}
return *it;
}
std::list::iterator it;
void PlaylistNode::PrintFullPlayList()

7. {
for (it = library.begin(); it != library.end(); ++it)
{
PrintPlaylist(*it);
}
}
void PlaylistNode::PrintSongByartist(string aartiename)
{
for (it = library.begin(); it != library.end(); ++it)
{
if (it->GetArtistName() == aartiename)
PrintPlaylist(*it);
}
}
void PlaylistNode::PrintSongtotalLen()
{
int TotalSonglengst = 0;
for (it = library.begin(); it != library.end(); ++it)
{
TotalSonglengst += it->GetSongLength();
}
cout << "Total songs Length (in seconds):" << TotalSonglengst << endl;
}
void PlaylistNode::PrintPlaylist(Playlist aPlayList)
{
cout << "Unique ID:" << aPlayList.GetID() << endl;
cout << "Song Name:" << aPlayList.GetSongName() << endl;
cout << "Artist Name:" << aPlayList.GetArtistName() << endl;
cout << "Song Length (in seconds):" << aPlayList.GetSongLength() << endl;
}
void PlaylistNode::Changeposition(int oldPostion, int newPostinon)
{
if (!library.empty())
{
if (newPostinon <= library.size)

8. {
Playlist oldPlalist = get(library, oldPostion);
Playlist New_Playlist = get(library, newPostinon);
Playlist pldpay(oldPlalist.GetID(), oldPlalist.GetSongName(), oldPlalist.GetArtistName(),
oldPlalist.GetSongLength());
/*library.insert(pldpay,newPostinon);
library.insert(New_Playlist, oldPostion);*/
}
else
{
cout << "The Postion is Not in the Range of LIB" << endl;
}
}
}
Playlist.h
#pragma once
#include
#include
#include
#include
#include
using namespace std;
class Playlist
{
private:
string uniqueID;
string songName;
string artistName;
int songLength;
public:
Playlist() { uniqueID = "", songName = "", artistName = "", songLength = 0; };
Playlist(string auniqueId, string asongName, string aArtistName, int aSongLength);
void InsertAfter();
void SetNext();

9. string GetID();
string GetSongName();
string GetArtistName();
int GetSongLength();
string GetNext();
void PrintPlaylistNode();
};
//#pragma once
//#include "Playlist.h"
//#include
class PlaylistNode
{
private:
std::list library;
Playlist get(list _list, int _i);
void PrintPlaylist(Playlist aPlayList);
public:
void Addsong(Playlist aPlayslist);
void Removesong(string aUnwiid);
void Changeposition(int oldPostion, int anewPostion);
void PrintSongByartist(string aAstist);
void PrintSongtotalLen();
void PrintFullPlayList();
};
Solution
Here is the modified code for you:
Main.cpp
#include
#include "Playlist.cpp"
using namespace std;
int main()
{
int choice;
string uqid = "";

10. string songnam = "";
string artname;
int len;
PlaylistNode PlaylistNode;
do
{
cout << "MENU" << endl;
cout << "a - Add song: " << endl;
cout << "d - Remove song: " << endl;
cout << "c - Change position of song " << endl;
cout << "s - Output songs by specific artist: " << endl;
cout << "t - Output total time of playlist (in seconds): " << endl;
cout << "o - Output full playlist " << endl;
cout << "q - QUIT PROGRAM " << endl;
cout << "Please enter your selection." << endl;
cin >> choice;
switch (choice)
{
case 'a':
{
cout << "ADD SONG" << endl;
cout << "Enter song's unique ID:" << endl;
cin >> uqid;
cout << "Enter song's name:" << endl;
cin >> songnam;
cout << "Enter artist's name:" << endl;
cin >> artname;
cout << "Enter Song len" << endl;
cin >> len;
Playlist playlistobj(uqid, songnam, artname, len);
PlaylistNode.Addsong(playlistobj);
break; //Add record
}
case 'd':
{
cout << "REMOVE SONG" << endl;

11. cout << "Enter song's unique ID:" << endl;
cin >> uqid;
PlaylistNode.Removesong(uqid);
}
break; //Display record
case 'c':
{
int Creentpos = 0;
int newpos = 0;
cout << "Enter song's current position:" << endl;
cin >> Creentpos;
cout << "Enter new position for song:" << endl;
cin >> newpos;
PlaylistNode.Changeposition(Creentpos, newpos);
}
case 's':
cout << "Enter artist's name:" << endl;
cin >> artname;
PlaylistNode.PrintSongByartist(artname);
break; //EDit record
case 't':
PlaylistNode.PrintSongtotalLen();
break; //EDit record
case 'o':
PlaylistNode.PrintFullPlayList();
break; //EDit record
case 'q':
cout << "QUIT PROGTRAM--" << endl;
break;
default: cout << "Invalid Selection" << endl;
}
} while
(choice == 'q');
system("PAUSE");
return 0;
}

12. Playlist.cpp:
#include "Playlist.h"
Playlist::Playlist(string auniqueId, string asongName, string aArtistName, int aSongLength)
{
uniqueID = auniqueId;
songName = asongName;
artistName = aArtistName;
songLength = aSongLength;
}
string Playlist::GetArtistName()
{
return artistName;
}
string Playlist::GetID()
{
return uniqueID;
}
string Playlist::GetSongName()
{
return songName;
}
int Playlist::GetSongLength()
{
return songLength;
}
void Playlist::SetNext()
{
}
string Playlist::GetNext()
{
return "";
}
void Playlist::InsertAfter() {
}
void Playlist::PrintPlaylistNode()
{

13. cout << "Unique ID:" << uniqueID << endl;
cout << "Song Name:" << songName << endl;
cout << "Artist Name:" << artistName << endl;
cout << "Song Length (in seconds):" << songLength << endl;
}
////
void PlaylistNode::Addsong(Playlist aPlaylist)
{
library.push_back(aPlaylist);
}
void PlaylistNode::Removesong(string aUnwiid)
{
if (library.size() > 0)
{
for (list::iterator it = library.begin(); it != library.end(); ++it)
{
if (it->GetID() == aUnwiid)
{
cout << it->GetSongName() << endl;
library.remove(*it);
break;
}
}
}
}
Playlist PlaylistNode::get(list _list, int _i) {
list::iterator it = _list.begin();
for (int i = 0; i<_i; i++) {
++it;
}
return *it;
}
std::list::iterator it;
void PlaylistNode::PrintFullPlayList()
{
for (it = library.begin(); it != library.end(); ++it)

14. {
PrintPlaylist(*it);
}
}
void PlaylistNode::PrintSongByartist(string aartiename)
{
for (it = library.begin(); it != library.end(); ++it)
{
if (it->GetArtistName() == aartiename)
PrintPlaylist(*it);
}
}
void PlaylistNode::PrintSongtotalLen()
{
int TotalSonglengst = 0;
for (it = library.begin(); it != library.end(); ++it)
{
TotalSonglengst += it->GetSongLength();
}
cout << "Total songs Length (in seconds):" << TotalSonglengst << endl;
}
void PlaylistNode::PrintPlaylist(Playlist aPlayList)
{
cout << "Unique ID:" << aPlayList.GetID() << endl;
cout << "Song Name:" << aPlayList.GetSongName() << endl;
cout << "Artist Name:" << aPlayList.GetArtistName() << endl;
cout << "Song Length (in seconds):" << aPlayList.GetSongLength() << endl;
}
void PlaylistNode::Changeposition(int oldPostion, int newPostinon)
{
if (!library.empty())
{
if (newPostinon <= library.size())
{
Playlist oldPlalist = get(library, oldPostion);
Playlist New_Playlist = get(library, newPostinon);

15. Playlist pldpay(oldPlalist.GetID(), oldPlalist.GetSongName(), oldPlalist.GetArtistName(),
oldPlalist.GetSongLength());
/*library.insert(pldpay,newPostinon);
library.insert(New_Playlist, oldPostion);*/
}
else
{
cout << "The Postion is Not in the Range of LIB" << endl;
}
}
}
Playlist.h:
#pragma once
#include
#include
#include
#include
#include
using namespace std;
class Playlist
{
private:
string uniqueID;
string songName;
string artistName;
int songLength;
public:
Playlist() { uniqueID = "", songName = "", artistName = "", songLength = 0; };
Playlist(string auniqueId, string asongName, string aArtistName, int aSongLength);
void InsertAfter();
void SetNext();
string GetID();
string GetSongName();
string GetArtistName();
int GetSongLength();
string GetNext();

16. void PrintPlaylistNode();
};
//#pragma once
//#include "Playlist.h"
//#include
class PlaylistNode
{
private:
std::list library;
Playlist get(list _list, int _i);
void PrintPlaylist(Playlist aPlayList);
public:
void Addsong(Playlist aPlayslist);
void Removesong(string aUnwiid);
void Changeposition(int oldPostion, int anewPostion);
void PrintSongByartist(string aAstist);
void PrintSongtotalLen();
void PrintFullPlayList();
};