473,785 Members | 2,255 Online
Bytes | Software Development & Data Engineering Community
+ Post

Home Posts Topics Members FAQ

Compile error.

This is an simple map, just an exercise. Who can help me fix this
compile issue?Thanks in advance.
#include <string>
#include <vector>
#include <iostream>
using std::vector;
using std::string;
using std::cout;
using std::endl;

template<typena me T>
class Map{
template<typena me U>
struct Pair{
string name;
U val;
Pair(string n ="", U v):name(n),val( v){}
};
vector<Pair<T vec;
Map(const Map&);
Map& operator=(const Map&);
typedef vector<Pair<T:: const_iterator CIT;
typedef vector<Pair<T:: iterator IT;
public:
Map(){}
double& operator[](const string&);
void print_all()cons t;
};
template<typena me T>
T& Map<T>::operato r[](const string& name)
{
IT it = vec.begin();
IT end = vec.end();
for(; it != end; ++it){
if(it->name == name) return it->val;
}
vec.push_back(P air<T>(name,T() ));
return vec.back().val;
}
template<typena me T>
void Map<T>::print_a ll()const
{
for(CIT p = vec.begin(); p != vec.end();++p){
cout << p->name << ": " << p->val << endl;
}
}
int main()
{
Map<intm;
m["zhu"] = 100;
m["li"] = 200;
m.print_all();
}
-*- mode: compilation; default-directory: "e:/tcplex/p2_ch13/" -*-
Compilation started at Sat Nov 15 21:42:28

g++ 13.8.cpp
13.8.cpp:20: error: type `std::vector<Ma p<T>::Pair<T>,
std::allocator< Map<T>::Pair<T >' is not derived from type `Map<T>'
13.8.cpp:20: error: ISO C++ forbids declaration of `const_iterator '
with no type
13.8.cpp:20: error: expected `;' before "CIT"
13.8.cpp:21: error: type `std::vector<Ma p<T>::Pair<T>,
std::allocator< Map<T>::Pair<T >' is not derived from type `Map<T>'
13.8.cpp:21: error: ISO C++ forbids declaration of `iterator' with no
type
13.8.cpp:21: error: expected `;' before "IT"
13.8.cpp:29: error: prototype for `T& Map<T>::operato r[](const
std::string&)' does not match any in class `Map<T>'
13.8.cpp:24: error: candidate is: double& Map<T>::operato r[](const
std::string&)
13.8.cpp:29: error: template definition of non-template `T&
Map<T>::operato r[](const std::string&)'
13.8.cpp: In member function `T& Map<T>::operato r[](const
std::string&)':
13.8.cpp:30: error: `IT' was not declared in this scope
13.8.cpp:30: error: expected `;' before "it"
13.8.cpp:31: error: expected `;' before "end"
13.8.cpp:32: error: `it' was not declared in this scope
13.8.cpp:32: error: `end' was not declared in this scope
13.8.cpp: In member function `void Map<T>::print_a ll() const':
13.8.cpp:41: error: `CIT' was not declared in this scope
13.8.cpp:41: error: expected `;' before "p"
13.8.cpp:41: error: `p' was not declared in this scope

Compilation exited abnormally with code 1 at Sat Nov 15 21:42:28


Nov 15 '08 #1
3 3997
On 11ÔÂ15ÈÕ, ÏÂÎç9ʱ43·Ö, Hill <zhubi...@gmail .com>wrote:
This is an simple map, just an exercise. Who can help me fix this
compile issue?Thanks in advance.
#include <string>
#include <vector>
#include <iostream>
using std::vector;
using std::string;
using std::cout;
using std::endl;

template<typena me T>
class Map{
template<typena me U>
struct Pair{
string name;
U val;
Pair(string n ="", U v):name(n),val( v){}
};
vector<Pair<T vec;
Map(const Map&);
Map& operator=(const Map&);
typedef vector<Pair<T:: const_iterator CIT;
typedef vector<Pair<T:: iterator IT;
const_iterator is a dependent type here,
try
typedef typename vector<Pair<T:: const_iterator CIT;
typedef typename vector<Pair<T:: iterator IT;
public:
Map(){}
double& operator[](const string&);
void print_all()cons t;};

template<typena me T>
T& Map<T>::operato r[](const string& name)
{
IT it = vec.begin();
IT end = vec.end();
for(; it != end; ++it){
if(it->name == name) return it->val;
}
vec.push_back(P air<T>(name,T() ));
return vec.back().val; }

template<typena me T>
void Map<T>::print_a ll()const
{
for(CIT p = vec.begin(); p != vec.end();++p){
cout << p->name << ": " << p->val << endl;
}}

int main()
{
Map<intm;
m["zhu"] = 100;
m["li"] = 200;
m.print_all();

}

-*- mode: compilation; default-directory: "e:/tcplex/p2_ch13/" -*-
Compilation started at Sat Nov 15 21:42:28

g++ 13.8.cpp
13.8.cpp:20: error: type `std::vector<Ma p<T>::Pair<T>,
std::allocator< Map<T>::Pair<T >' is not derived from type `Map<T>'
13.8.cpp:20: error: ISO C++ forbids declaration of `const_iterator '
with no type
13.8.cpp:20: error: expected `;' before "CIT"
13.8.cpp:21: error: type `std::vector<Ma p<T>::Pair<T>,
std::allocator< Map<T>::Pair<T >' is not derived from type `Map<T>'
13.8.cpp:21: error: ISO C++ forbids declaration of `iterator' with no
type
13.8.cpp:21: error: expected `;' before "IT"
13.8.cpp:29: error: prototype for `T& Map<T>::operato r[](const
std::string&)' does not match any in class `Map<T>'
13.8.cpp:24: error: candidate is: double& Map<T>::operato r[](const
std::string&)
13.8.cpp:29: error: template definition of non-template `T&
Map<T>::operato r[](const std::string&)'
13.8.cpp: In member function `T& Map<T>::operato r[](const
std::string&)':
13.8.cpp:30: error: `IT' was not declared in this scope
13.8.cpp:30: error: expected `;' before "it"
13.8.cpp:31: error: expected `;' before "end"
13.8.cpp:32: error: `it' was not declared in this scope
13.8.cpp:32: error: `end' was not declared in this scope
13.8.cpp: In member function `void Map<T>::print_a ll() const':
13.8.cpp:41: error: `CIT' was not declared in this scope
13.8.cpp:41: error: expected `;' before "p"
13.8.cpp:41: error: `p' was not declared in this scope

Compilation exited abnormally with code 1 at Sat Nov 15 21:42:28
Nov 15 '08 #2
On 11ÔÂ15ÈÕ, ÏÂÎç10ʱ54·Ö, Barry <dhb2...@gmail. comwrote:
On 11ÔÂ15ÈÕ, ÏÂÎç9ʱ43·Ö, Hill <zhubi...@gmail .comwrote:
This is an simple map, just an exercise. Who can help me fix this
compile issue?Thanks in advance.
#include <string>
#include <vector>
#include <iostream>
using std::vector;
using std::string;
using std::cout;
using std::endl;
template<typena me T>
class Map{
template<typena me U>
struct Pair{
string name;
U val;
Pair(string n ="", U v):name(n),val( v){}
};
vector<Pair<T vec;
Map(const Map&);
Map& operator=(const Map&);
typedef vector<Pair<T:: const_iterator CIT;
typedef vector<Pair<T:: iterator IT;

const_iterator is a dependent type here,
try
typedef typename vector<Pair<T:: const_iterator CIT;
typedef typename vector<Pair<T:: iterator IT;
public:
Map(){}
double& operator[](const string&);
void print_all()cons t;};
template<typena me T>
T& Map<T>::operato r[](const string& name)
{
IT it = vec.begin();
IT end = vec.end();
for(; it != end; ++it){
if(it->name == name) return it->val;
}
vec.push_back(P air<T>(name,T() ));
return vec.back().val; }
template<typena me T>
void Map<T>::print_a ll()const
{
for(CIT p = vec.begin(); p != vec.end();++p){
cout << p->name << ": " << p->val << endl;
}}
int main()
{
Map<intm;
m["zhu"] = 100;
m["li"] = 200;
m.print_all();
}
-*- mode: compilation; default-directory: "e:/tcplex/p2_ch13/" -*-
Compilation started at Sat Nov 15 21:42:28
g++ 13.8.cpp
13.8.cpp:20: error: type `std::vector<Ma p<T>::Pair<T>,
std::allocator< Map<T>::Pair<T >' is not derived from type `Map<T>'
13.8.cpp:20: error: ISO C++ forbids declaration of `const_iterator '
with no type
13.8.cpp:20: error: expected `;' before "CIT"
13.8.cpp:21: error: type `std::vector<Ma p<T>::Pair<T>,
std::allocator< Map<T>::Pair<T >' is not derived from type `Map<T>'
13.8.cpp:21: error: ISO C++ forbids declaration of `iterator' with no
type
13.8.cpp:21: error: expected `;' before "IT"
13.8.cpp:29: error: prototype for `T& Map<T>::operato r[](const
std::string&)' does not match any in class `Map<T>'
13.8.cpp:24: error: candidate is: double& Map<T>::operato r[](const
std::string&)
13.8.cpp:29: error: template definition of non-template `T&
Map<T>::operato r[](const std::string&)'
13.8.cpp: In member function `T& Map<T>::operato r[](const
std::string&)':
13.8.cpp:30: error: `IT' was not declared in this scope
13.8.cpp:30: error: expected `;' before "it"
13.8.cpp:31: error: expected `;' before "end"
13.8.cpp:32: error: `it' was not declared in this scope
13.8.cpp:32: error: `end' was not declared in this scope
13.8.cpp: In member function `void Map<T>::print_a ll() const':
13.8.cpp:41: error: `CIT' was not declared in this scope
13.8.cpp:41: error: expected `;' before "p"
13.8.cpp:41: error: `p' was not declared in this scope
Compilation exited abnormally with code 1 at Sat Nov 15 21:42:28

Thanks very much.
But now i upgrade the code to let it can hold types without default
constructor. But caught in another error:
#include <string>
#include <vector>
#include <iostream>
using std::vector;
using std::string;
using std::cout;
using std::endl;
using std::ostream;

template<typena me T>
struct Aligner{
union{
long double long_double_;
long long_;
void (*simple_functi on_ptr)();
};
};

template<typena me T>
class Map{
template<typena me U>
struct Pair{
string name;
union{
char raw_mem[sizeof(U)];
Aligner<Udummy;
}val;
Pair(string n = ""):name(n) {}

Pair& operator=(const U& v){
new(val.raw_mem ) U(v);
return *this;
}
};
vector<Pair<T vec;
Map(const Map&);
Map& operator=(const Map&);
typedef typename vector<Pair<T:: const_iterator CIT;
typedef typename vector<Pair<T:: iterator IT;
public:
Map(){}
Pair<T>& operator[](const string&);
void print_all()cons t;
};
template<typena me T>
Pair<T>& Map<T>::operato r[](const string&
name)////////////////////////////line 46
{
IT it = vec.begin();
IT end = vec.end();
for(; it != end; ++it){
if(it->name == name) return *it;
}
vec.push_back(P air<T>(name));
return vec.back();
}
template<typena me T>
void Map<T>::print_a ll()const
{
for(CIT p = vec.begin(); p != vec.end();++p){
cout << p->name << ": " << *(T*)(&p->val.raw_mem[0]) << endl;
}
}
struct stu{
string name;
string id;
stu(string n, string i):name(n), id(i){}
//stu(){}
};
ostream& operator<<(ostr eam& os, const stu& s)
{
return os << " Name: " << s.name << " Id: " << s.id ;
}

int main()
{
Map<stum;
m["first"] = stu("Zhubicen", "011062");
m.print_all();
}

-*- mode: compilation; default-directory: "z:/tcplex/p2_ch13/" -*-
Compilation started at Sun Nov 16 19:33:03

g++ 13.8.cpp
13.8.cpp:46: error: expected constructor, destructor, or type
conversion before '<' token

Compilation exited abnormally with code 1 at Sun Nov 16 19:33:03



Nov 16 '08 #3
On Nov 15, 6:43 pm, Hill <zhubi...@gmail .comwrote:
This is an simple map, just an exercise. Who can help me fix this
compile issue?Thanks in advance.
#include <string>
#include <vector>
#include <iostream>
using std::vector;
using std::string;
using std::cout;
using std::endl;

template<typena me T>
class Map{
template<typena me U>
struct Pair{
string name;
U val;
Pair(string n ="", U v):name(n),val( v){}
};
vector<Pair<T vec;
Map(const Map&);
Map& operator=(const Map&);
typedef vector<Pair<T:: const_iterator CIT;
typedef vector<Pair<T:: iterator IT;
public:
Map(){}
double& operator[](const string&);
void print_all()cons t;};

template<typena me T>
T& Map<T>::operato r[](const string& name)
{
IT it = vec.begin();
IT end = vec.end();
for(; it != end; ++it){
if(it->name == name) return it->val;
}
vec.push_back(P air<T>(name,T() ));
return vec.back().val; }

template<typena me T>
void Map<T>::print_a ll()const
{
for(CIT p = vec.begin(); p != vec.end();++p){
cout << p->name << ": " << p->val << endl;
}}

int main()
{
Map<intm;
m["zhu"] = 100;
m["li"] = 200;
m.print_all();

}

-*- mode: compilation; default-directory: "e:/tcplex/p2_ch13/" -*-
Compilation started at Sat Nov 15 21:42:28

g++ 13.8.cpp
13.8.cpp:20: error: type `std::vector<Ma p<T>::Pair<T>,
std::allocator< Map<T>::Pair<T >' is not derived from type `Map<T>'
13.8.cpp:20: error: ISO C++ forbids declaration of `const_iterator '
with no type
13.8.cpp:20: error: expected `;' before "CIT"
13.8.cpp:21: error: type `std::vector<Ma p<T>::Pair<T>,
std::allocator< Map<T>::Pair<T >' is not derived from type `Map<T>'
13.8.cpp:21: error: ISO C++ forbids declaration of `iterator' with no
type
13.8.cpp:21: error: expected `;' before "IT"
13.8.cpp:29: error: prototype for `T& Map<T>::operato r[](const
std::string&)' does not match any in class `Map<T>'
13.8.cpp:24: error: candidate is: double& Map<T>::operato r[](const
std::string&)
13.8.cpp:29: error: template definition of non-template `T&
Map<T>::operato r[](const std::string&)'
13.8.cpp: In member function `T& Map<T>::operato r[](const
std::string&)':
13.8.cpp:30: error: `IT' was not declared in this scope
13.8.cpp:30: error: expected `;' before "it"
13.8.cpp:31: error: expected `;' before "end"
13.8.cpp:32: error: `it' was not declared in this scope
13.8.cpp:32: error: `end' was not declared in this scope
13.8.cpp: In member function `void Map<T>::print_a ll() const':
13.8.cpp:41: error: `CIT' was not declared in this scope
13.8.cpp:41: error: expected `;' before "p"
13.8.cpp:41: error: `p' was not declared in this scope

Compilation exited abnormally with code 1 at Sat Nov 15 21:42:28
In your code if type U is not specially treated than type T as well as
it is directly dependent on type T then why did you introduce type U.
Better to remove it.

template<typena me T>
class Map{
struct Pair{
string name;
T val;
Pair(string n ="", U v):name(n),val( v){}
};
vector<Pairvec;
Pair(string n ="", U v)
In this definition you're providing default argument from left side
which is not acceptable at all according to C++.
typedef vector<Pair<T:: const_iterator CIT;
In this statement you're missing typename keyword. Use the following
statement
typedef typename vector<Pair<T:: const_iterator CIT;
double& operator[](const string&);
Why return type is double???

Check all these things and your compilation error will be removed.
--
Daya
Nov 17 '08 #4

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics
4
2232
compile error? why?
by: Danny Boelens | last post by:
Hi all, today I ran into a compile error after a compiler upgrade. I made a small example to demonstrate my compile error: template<typename T1, typename T2> class A {}; class B
C / C++
5
3336
compile time optimization problem
by: Carmine Cairo | last post by:
Hi, I'm working on a project and today I've note a little problem during the compile fase. Here a little piece of code: // 1st version welldone = 0; size = p->getSize(); backbone = new rightType;
C / C++
5
3822
XmlSchemaSet Compile error ?
by: Brice Prunier | last post by:
Here under 4 schemas i'm working with ( it may be long: sorry...) The context is the following : Resident.xsd imports Person.xsd and includes Common.xsd ( anonimous schema: no TargetNamespace ) Person.xsd includes Common-Naming.xsd ( anonimous schemas ) Common-Naming.xsd includes common.xsd ( both are anonimous schemas ) Compilation of Resident.xsd raise the following exception: "System.Xml.Schema.XmlSchemaException: The attribute 'oid'...
.NET Framework
10
19730
"Use of possibly unassigned field" compile error
by: Chris LaJoie | last post by:
Our company has been developing a program in C# for some time now, and we haven't had any problems with it, but just last night something cropped up that has me, and everyone else, stumped. I have a struct that contains several different types of data. This struct is used throuout the program. Now, when I compile, I get 6 errors, all of them "Use of possibly unassigned field 'awayTime'" or "Use of possibly unassigned field 'intlTime'"....
C# / C Sharp
6
2860
Compile error when 2 pages use same codebehind file
by: Thomas Connolly | last post by:
I have 2 pages referencing the same codebehind file in my project. Originally the pages referenced separate code behind files. Once I changed the reference to the same file, everything worked fine while the file was in the project directory. When the obsolete file was removed from the project directory, my application will no longer compile. Can someone please help with this issue? Thank in advance, Tom
ASP.NET
0
1904
Internal Compile Error
by: Jim Heavey | last post by:
Internal Compiler Error: stage 'BEGIN' Hello, I had an application which was working just fine and I decided to modify all database access within the application to utilizie a new Namespace that I had developed which would handle all database access. After I modified all of the code to point to the new namespace and created all of the necessary references, I get an internal compile error when I attempt to re-compile. I have create a new...
ASP.NET
9
3519
creating a compile time error... is it possible?
by: ThunderMusic | last post by:
Hi, I'd like to create a compile time error in my class... maybe there's a way already built in in the framework so I can achieve what I want... I have 2 constructors in my class. One of them has mandatory parameters, I mean, they should not be null nor empty (for strings). So I'd make the validation in the constructor and generate a compile-time error if the validation does not match... Is there a way to achieve this or to specify...
.NET Framework
4
1845
strange compile when using inheritance
by: tony | last post by:
Hello! My question is about calling this method CollectData below but I get a compile error that I shouldn't have because the type parameter is correct. The compile error is the following: C:\PK\Development\Products\UTCAS\4.0\SRC\MeltPracApplication\Dialog\Composit ionForm.cs(942): Argument '1': cannot convert from 'ref MeltPracData.MeltPracDataComposition' to 'ref MeltPracCommon.IDialogPostData'
C# / C Sharp
5
5045
compile error: new : cannot specify initializer for arrays
by: wong_powah | last post by:
#include <vector> #include <iostream> using std::cout; using std::vector; enum {DATASIZE = 20}; typedef unsigned char data_t;
C / C++
2
4143
failed to compile boost.system with msvc-7.1
by: BruceWho | last post by:
I downloaded boost1.35.0 and built it with following command: bjam --toolset=msvc-7.1 --variant=release --threading=multi -- link=shared --with-system stage and it failed to compile, error message is: E:\software\development\boost_1_35_0\boost_1_35_0>bjam -- toolset=msvc-7.1 --variant=release --threading=multi --link=shared --
C / C++
0
9645
marktang
What is ONU?
by: marktang | last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However, people are often confused as to whether an ONU can Work As a Router. In this blog post, we’ll explore What is ONU, What Is Router, ONU & Router’s main usage, and What is the difference between ONU and Router. Let’s take a closer look ! Part I. Meaning of...
General
0
9481
Changing the language in Windows 10
by: Hystou | last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can effortlessly switch the default language on Windows 10 without reinstalling. I'll walk you through it. First, let's disable language synchronization. With a Microsoft account, language settings sync across devices. To prevent any complications,...
Windows Server
0
10341
Oralloy
Problem With Comparison Operator <=> in G++
by: Oralloy | last post by:
Hello folks, I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>". The problem is that using the GNU compilers, it seems that the internal comparison operator "<=>" tries to promote arguments from unsigned to signed. This is as boiled down as I can make it. Here is my compilation command: g++-12 -std=c++20 -Wnarrowing bit_field.cpp Here is the code in...
C / C++
1
10095
The easy way to turn off automatic updates for Windows 10/11
by: Hystou | last post by:
Overview: Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For most users, this new feature is actually very convenient. If you want to control the update process,...
Windows Server
0
9954
tracyyun
Discussion: How does Zigbee compare with other wireless protocols in smart home applications?
by: tracyyun | last post by:
Dear forum friends, With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each protocol has its own unique characteristics and advantages, but as a user who is planning to build a smart home system, I am a bit confused by the choice of these technologies. I'm particularly interested in Zigbee because I've heard it does some...
General
0
8979
agi2029
AI Job Threat for Devs
by: agi2029 | last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then launch it, all on its own.... Now, this would greatly impact the work of software developers. The idea...
Career Advice
0
6741
Couldn’t get equations in html when convert word .docx file to html file in C#.
by: conductexam | last post by:
I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and then checking html paragraph one by one. At the time of converting from word file to html my equations which are in the word document file was convert into image. Globals.ThisAddIn.Application.ActiveDocument.Select();...
C# / C Sharp
0
5513
Windows Forms - .Net 8.0
by: adsilva | last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
Visual Basic .NET
2
3656
muto222
How to add payments to a PHP MySQL app.
by: muto222 | last post by:
How can i add a mobile payment intergratation into php mysql website.
PHP

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.

BYTES.COM © 2024
About Bytes
Terms Of Use
Privacy Policy
Sitemap
Advertise on Bytes
How to Post and Respond on Bytes
How to Promote and Link on Bytes
How to increase your Ranking on Bytes
Become a Recognized Expert on Bytes
Feedback Welcomed! Contact Us