473,322 Members | 1,403 Online
Bytes | Software Development & Data Engineering Community
Post Job

Home Posts Topics Members FAQ

Join Bytes to post your question to a community of 473,322 software developers and data experts.

namespace question

Hi all:

I am using a code from third party. I write my own part and add it to
that code and compile together.
I try to use "vector" in my program. So I add "#include <vector>" to
my program.
But when I compile my program together with the code from the third
party,
the compiler reports error: redefinition of `class vector'.

I look at the code from the third party and find that in one file of
that code,
"class vector" is defined for other purpose.
I can not modify the code from the third party, because it may make
the situation worse.
What should I do to my own program to solve the name confliction
problem?

Thanks a lot.

John
Jul 22 '05 #1
10 2422

"John" <jo*********@yahoo.com> wrote in message
news:c3*************************@posting.google.co m...
Hi all:

I am using a code from third party. I write my own part and add it to
that code and compile together.
I try to use "vector" in my program. So I add "#include <vector>" to
my program.
But when I compile my program together with the code from the third
party,
the compiler reports error: redefinition of `class vector'.

I look at the code from the third party and find that in one file of
that code,
"class vector" is defined for other purpose.
I can not modify the code from the third party, because it may make
the situation worse.
What should I do to my own program to solve the name confliction
problem?


Don't write using namesapce std; in your code. You will need to refer to the
standard vector class as std::vector then.
Jul 22 '05 #2
John wrote:
Hi all:

I am using a code from third party. I write my own part and add it to
that code and compile together.
I try to use "vector" in my program. So I add "#include <vector>" to
my program.
But when I compile my program together with the code from the third
party, the compiler reports error: redefinition of `class vector'.

I look at the code from the third party and find that in one file of
that code, "class vector" is defined for other purpose.
I can not modify the code from the third party, because it may make
the situation worse.
What should I do to my own program to solve the name confliction
problem?


The C++ standard class vector is in namespace std, so unless your 3rd
party library puts it there, too, there shouldn't be a name conflict.
After all, that's why namespaces exist.
If your compiler doesn't put vector into namespace std, then it is
probably quite outdated and you should consider using a more recent
one.

Jul 22 '05 #3
John posted:
Hi all:

I am using a code from third party. I write my own part and add it to
that code and compile together.
I try to use "vector" in my program. So I add "#include <vector>" to
my program.
But when I compile my program together with the code from the third
party,
the compiler reports error: redefinition of `class vector'.

I look at the code from the third party and find that in one file of
that code,
"class vector" is defined for other purpose.
I can not modify the code from the third party, because it may make
the situation worse.
What should I do to my own program to solve the name confliction
problem?

Thanks a lot.

John

namespace ThirdParty
{

#include <thirdpary>
}
std::vector
ThirdParty::vector
using namespace std
vector //refers to std::vector

-JKop
Jul 22 '05 #4
jo*********@yahoo.com (John) wrote in message news:<c3*************************@posting.google.c om>...
Hi all:

I am using a code from third party. I write my own part and add it to
that code and compile together.
I try to use "vector" in my program. So I add "#include <vector>" to
my program.
But when I compile my program together with the code from the third
party,
the compiler reports error: redefinition of `class vector'.

I look at the code from the third party and find that in one file of
that code,
"class vector" is defined for other purpose.
I can not modify the code from the third party, because it may make
the situation worse.
What should I do to my own program to solve the name confliction
problem?
Well, the vector template that is defined in <vector> resides in
namespace std, so you should still be able to use it even in the
presence of the other vector class by specifying std::vector instead
of just vector. Note also that getting rid of using directives (e.g.
using namespace std) is generally a good idea, and will help identify
more name collisions between std::vector and your vendors' vector as
well.

HTH, Dave Moore
Thanks a lot.

John

Jul 22 '05 #5
On Wed, 02 Jun 2004 12:32:50 GMT in comp.lang.c++, JKop <NU**@NULL.NULL>
wrote,
namespace ThirdParty
{

#include <thirdpary>
}


You think so, huh? Where is the linker going to find the definition of
ThirdParty::vector or anything else?

Jul 22 '05 #6
Hi all:

Thanks for reply.
In my program, I already use std::vector except the line: #include
<vector>.
Below is part of the error message:
In file included from
/usr/lib/gcc-lib/i386-linux/2.95.4/../../../../include/g++-3/vector.h:32,
from mycode.cc:35:
/usr/lib/gcc-lib/i386-linux/2.95.4/../../../../include/g++-3/stl_vector.h:153:
`vector' is not a template type
/usr/lib/gcc-lib/i386-linux/2.95.4/../../../../include/g++-3/stl_vector.h:154:
redefinition of `class vector'
mobile/god.h:117: previous definition here
/usr/lib/gcc-lib/i386-linux/2.95.4/../../../../include/g++-3/stl_vector.h:156:
invalid member template declaration `vector::_Base'
/usr/lib/gcc-lib/i386-linux/2.95.4/../../../../include/g++-3/stl_vector.h:158:
invalid member template declaration `vector::value_type'

mycode.cc is my own code. Line 35 is #include <vector>. mobile/god.h
is the code
from third party.
I also use list in my code, the compiler does not complain it.

Thanks a lot.

John

Rolf Magnus <ra******@t-online.de> wrote in message news:<c9*************@news.t-online.com>...
John wrote:
Hi all:

I am using a code from third party. I write my own part and add it to
that code and compile together.
I try to use "vector" in my program. So I add "#include <vector>" to
my program.
But when I compile my program together with the code from the third
party, the compiler reports error: redefinition of `class vector'.

I look at the code from the third party and find that in one file of
that code, "class vector" is defined for other purpose.
I can not modify the code from the third party, because it may make
the situation worse.
What should I do to my own program to solve the name confliction
problem?


The C++ standard class vector is in namespace std, so unless your 3rd
party library puts it there, too, there shouldn't be a name conflict.
After all, that's why namespaces exist.
If your compiler doesn't put vector into namespace std, then it is
probably quite outdated and you should consider using a more recent
one.

Jul 22 '05 #7
John wrote:
Hi all:

Thanks for reply.
In my program, I already use std::vector except the line: #include
<vector>.
Below is part of the error message:
In file included from
/usr/lib/gcc-lib/i386-linux/2.95.4/../../../../include/g++-3/vector.h:32,

^^^^^^
This is your problem. The compiler is too old. g++ versions before 3.x
are not compliant wrt namespace std. They make std a synonym for the
global namespace. If possible, you should upgrade to gcc 3.x.

Jul 22 '05 #8
David Harmon posted:
On Wed, 02 Jun 2004 12:32:50 GMT in comp.lang.c++, JKop <NU**@NULL.NULL>
wrote,
namespace ThirdParty {

#include <thirdpary> }


You think so, huh? Where is the linker going to find the definition of
ThirdParty::vector or anything else?

Let's assume that there's:
ThirdParty.hpp
ThirdParty.cpp

In the Source Code file in which you wish to use this library, put:

namespace ThirdParty
{
#include <thirdparty.hpp>
}

And now, for the Source code file... Don't actually add it to your project
to be compiled; instead, do this: Make another file
"ThirdPartySourceCode.cpp", and put the following into it:
namespeace ThirdParty
{

using namespace ThirdParty;

#include <thirdparty.cpp>
}

-JKop
Jul 22 '05 #9
On Wed, 02 Jun 2004 18:16:05 GMT in comp.lang.c++, JKop <NU**@NULL.NULL>
wrote,
Let's assume that there's:
ThirdParty.hpp
ThirdParty.cpp


No, that's too easy. Instead there is

ThirdParty.hpp
ThirdParty.lib

Jul 22 '05 #10
David Harmon posted:
On Wed, 02 Jun 2004 18:16:05 GMT in comp.lang.c++, JKop <NU**@NULL.NULL>
wrote,
Let's assume that there's:
ThirdParty.hpp
ThirdParty.cpp


No, that's too easy. Instead there is

ThirdParty.hpp
ThirdParty.lib

Library files are the devil!
-JKop
Jul 22 '05 #11

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

Similar topics

1
by: John L. Clark | last post by:
I am curious as to the rationale, and effect, of having default namespaces not applying (directly) to attributes (see http://www.w3.org/TR/REC-xml-names/#defaulting). Given an attribute without a...
25
by: kj | last post by:
Consider the following XML document: <?xml version='1.0' encoding='UTF-8'?> <bar:foo xmlns:bar='someuri'> <baz/> </bar:foo> What namespace does baz belong to? What is this namespace bound...
3
by: Mike Dickens | last post by:
hi, i'm sure this has come up before but havn't managed to find an answer. if i have the following xslt <?xml version="1.0" encoding="ISO-8859-1"?> <xsl:stylesheet method="xml" version="1.0"...
6
by: clinton__bill | last post by:
Hi, I usually use "using namespace <namespace_name>" to reference a namespace. Today I run across a code, in its header file it has this, namespace SP1{ class C1; } While SP1::C1 is a...
2
by: Tony Johansson | last post by:
Hello! I'm reading a book about C++ and there is something that I don't understand so I ask you. Below I have the text from the book and the code from the file where main is located and some...
20
by: Patrick Guio | last post by:
Dear all, I have some problem with insertion operator together with namespace. I have a header file foo.h containing declaration of classes, typedefs and insertion operators for the typedefs in...
4
by: Programatix | last post by:
Hi, Normally, I would use Namespace for all the window forms I created. With VS 2005, the code generated by the designer is hidden using partial keyword. The question is, is there an efficient...
32
by: toolmaster | last post by:
Since many of the modern computer languages have built-in namespace features, I can't understand why not add this feature into standard C. I've heard many people complain of the lacking of...
3
by: CrazyJohn | last post by:
Hi guys, This is my first time posting question here, if I break any rules, please kindly point out. And I'm really glad to be a part of this community. Here is my question, Our lecturer...
17
by: Peng Yu | last post by:
Hi, I'm wondering if there is something in namespace like the 'private' keyword in class? I want to define some class or function that can only be used within that namespace. Thanks, Peng
0
by: DolphinDB | last post by:
Tired of spending countless mintues downsampling your data? Look no further! In this article, you’ll learn how to efficiently downsample 6.48 billion high-frequency records to 61 million...
0
isladogs
by: isladogs | last post by:
The next Access Europe meeting will be on Wednesday 6 Mar 2024 starting at 18:00 UK time (6PM UTC) and finishing at about 19:15 (7.15PM). In this month's session, we are pleased to welcome back...
1
isladogs
by: isladogs | last post by:
The next Access Europe meeting will be on Wednesday 6 Mar 2024 starting at 18:00 UK time (6PM UTC) and finishing at about 19:15 (7.15PM). In this month's session, we are pleased to welcome back...
0
by: jfyes | last post by:
As a hardware engineer, after seeing that CEIWEI recently released a new tool for Modbus RTU Over TCP/UDP filtering and monitoring, I actively went to its official website to take a look. It turned...
0
by: ArrayDB | last post by:
The error message I've encountered is; ERROR:root:Error generating model response: exception: access violation writing 0x0000000000005140, which seems to be indicative of an access violation...
1
by: CloudSolutions | last post by:
Introduction: For many beginners and individual users, requiring a credit card and email registration may pose a barrier when starting to use cloud servers. However, some cloud server providers now...
1
by: Defcon1945 | last post by:
I'm trying to learn Python using Pycharm but import shutil doesn't work
0
by: af34tf | last post by:
Hi Guys, I have a domain whose name is BytesLimited.com, and I want to sell it. Does anyone know about platforms that allow me to list my domain in auction for free. Thank you
0
by: Faith0G | last post by:
I am starting a new it consulting business and it's been a while since I setup a new website. Is wordpress still the best web based software for hosting a 5 page website? The webpages will be...

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.