473,836 Members | 1,457 Online
Bytes | Software Development & Data Engineering Community
+ Post

Home Posts Topics Members FAQ

template specialization of a nested class

er
hello,

here's my problem:

struct A{};
struct B{};
struct T{};

struct outer{

template<typena me U>
struct inner{
typedef A type;
};

//specialization inside outer's scop has compile error:
//explicit specialization in non-namespace scope ‘struct outer’|
//using gcc version 4.2.3

};

//expected unqualified-id before ‘{’ token|

template<>
outer::inner<T> {
typedef B type;
};
thanks.
Sep 16 '08 #1
2 2769
er
On Sep 16, 7:27*pm, er <erwann.rog...@ gmail.comwrote:
hello,

here's my problem:

struct A{};
struct B{};
struct T{};

struct outer{

* * template<typena me U>
* * struct inner{
* * * * typedef A type;
* * };

* * //specialization inside outer's scop has compile error:
* * //explicit specialization in non-namespace scope ‘struct outer’|
* * //using gcc version 4.2.3

};

//expected unqualified-id before ‘{’ token|

template<>
outer::inner<T> {
* typedef B type;

};

thanks.
oh! i guess i should have template<struct ...
Sep 17 '08 #2
#include <stdafx.h>
#include <stdio.h>
#include <cstdlib>
#include <iostream>
using namespace std;

struct A{};
struct B{};
struct T{};
struct outer{
template<typena me U>
struct inner{
typedef A type;
};
//specialization inside outer's scop has compile error:
//explicit specialization in non-namespace scope ‘struct outer’|
//using gcc version 4.2.3
};
//expected unqualified-id before ‘{’ token|
template<>
struct outer::inner<ch ar>{
typedef B type;
};

int main(int argc, char *argv[])
{

system("PAUSE") ;
return 0;
}
cheers!
Sep 17 '08 #3

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

Similar topics

2
2545
by: SainTiss | last post by:
Hi, If you've got a template class with lots of methods, and then you've got a type which works with the template, except for one method... What you need to do there is specialize the template for your type. However, this requires you to copy the whole template, and change the method, which leads to code duplication... If there's only 1 template parameter, one can specialize the method
2
5782
by: Jeff | last post by:
/* -------------------------------------------------------------------------- Hello, I was experimenting with class templates and specializing member functions and came across a simple problem which I can't figure out. I have a simple class C with 2 template member objects, and a function print() that prints the value of these objects. I defined a specialization of print() for C<string, char> which is called correctly. Then I wanted...
7
4961
by: Andrew Ward | last post by:
Hi All, Considering the following code: struct A; struct B { std::list<A> l; };
2
7953
by: Xenos | last post by:
The new version of GCC is out and in its list of changes, it talks about the C++ Standard's requirements for using the typename and template keywords to disambiguate dependent names. I'm use to seeing typename being used, but I've never seen template used for this purpose. I've studied there example for a long time, and still don't understand what situations call for the template keyword (and reading the standard, to me, is Greek). Can...
0
1500
by: Patrick Kowalzick | last post by:
Dear all, the following code is illegeal (but compiles with MSVC 7.1): // *** illegal *** struct outer0 { template<typename inner_var> struct inner { }; template<>
13
2008
by: Imre | last post by:
Please take a look at the following code: template <typename T, typename Enable = void> class A { public: enum { value = 0 }; }; template <typename T>
9
2790
by: Marek Vondrak | last post by:
Hello. I have written the following program and am curious why it prints "1" "2". What are the exact effects of explicitly providing function template parameters at the call? Is the second assign() function really a specialization of the first assign() or is it an assign() overload? Thank you. -- Marek
9
3476
by: stephen.diverdi | last post by:
Can anyone lend a hand on getting this particular template specialization working? I've been trying to compile with g++ 4.1 and VS 2005. //------------------------------------------------------------------ // my regular glass class A { }; // my templated class
2
7707
by: Barry | last post by:
The following code compiles with VC8 but fails to compiles with Comeau online, I locate the standard here: An explicit specialization of any of the following:
5
3744
by: huili80 | last post by:
For example, like in the following, the part commented out was intended as partial spectialzation, but it would even compile. Is it even legal to partially specialize a nested template class inside another template class? template < typename T > struct A { template < typename U > struct B
0
9825
marktang
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...
0
10846
Oralloy
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...
1
10595
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,...
0
10254
tracyyun
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...
0
9379
agi2029
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...
1
7793
isladogs
by: isladogs | last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM). In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules. He will explain when you may want to use classes instead of User Defined Types (UDT). For example, to manage the data in unbound forms. Adolph will...
0
5650
by: TSSRALBI | last post by:
Hello I'm a network technician in training and I need your help. I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs. The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols. I succeeded, with both firewalls in the same network. But I'm wondering if it's possible to do the same thing, with 2 Pfsense firewalls...
0
5828
by: adsilva | last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
1
4458
by: 6302768590 | last post by:
Hai team i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system

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.