473,725 Members | 1,787 Online
Bytes | Software Development & Data Engineering Community
+ Post

Home Posts Topics Members FAQ

Explicit and partial template specialization nested in classes.

Dear all,

the following code is illegeal (but compiles with MSVC 7.1):

// *** illegal ***
struct outer0 {
template<typena me inner_var>
struct inner { };

template<>
struct inner<void> { };
};
// ***

but is the following legal (compiles with g++, comeau, MSVC7.1) ?

// *** legal ***
struct outer0 {
template<typena me inner_var, typename hack = void>
struct inner { };

template<typena me hack>
struct inner<void,hack > { };
};
// ***

Example copied from:
http://lists.debian.org/debian-gcc/2.../msg00015.html

There I found as well:
In an explicit specialization declaration for a member of a class
template or a member template that appears in namespace scope, the
member template and some of its enclosing class templates may remain
unspecialized, except that the declaration shall not explicitly
specialize a class member template if its enclosing class templates
are not explicitly specialized as well.


but it does not tell if its legal :(.

Regards,
Patrick
Jul 22 '05 #1
0 1495

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

Similar topics

17
6859
by: Paul MG | last post by:
Hi Template partial specialization always seems like a fairly straightforward concept - until I try to do it :). I am trying to implement the input sequence type (from Stroustrup section 18.3.1, 'Iseq'). I want the version for containers that he gives, but also to provide a specialization for construction from a pair<It,It> (eg because that is returned by equal_range()).
9
2545
by: Philip Lawatsch | last post by:
Hi I'd like to implement some kind if type traits myself, but I have to support broken compilers (like visual studio) that do not support Partial Specialization. My first shot was something like this: ----8<--- typedef char IsPODForListArrayTrue;
2
1507
by: Shekhar | last post by:
template<typename T> struct A{}; //line 1 template<typename T> struct B{}; //line 2 template<typename T> struct B<A<T> > {}; //line 3: partial specialization of B VC6.0 compiler results for the above: at line 3: error C2989: 'B<struct A<T> >' : template class has already been defined as a non-template class
4
1843
by: CoolPint | last post by:
I would be grateful if someone could point out if I am understanding correctly and suggest ways to improve. Sorry for the long message and I hope you will kindly bear with it. I have to make it elaborate to make sure my questions are clear enough. Let's say I need to write a function whose logic is same for all types (T) except in the case of T * (including const T *). Furtheremore , the function needs to be written differently for...
8
4799
by: Ferdi Smit | last post by:
I've never understood the rationale of allowing partial, but not explicit specialization for classes at non-namespace scope. Ie.: struct A { template <typename T1, typename T2> struct B {}; // this is not allowed: template <> struct B<int, float> {};
4
1497
by: wakun | last post by:
Hi there, I am learning template programming. When testing the partial specialization, I have some probelms Here is a full templated class template <typename T, int n> class CT { public: T data;
6
2763
by: wkaras | last post by:
I tried a couple of compilers, and both gave errors compiling this: template <bool fin, typename T> T foo(T val); template <typename T> T foo<true, T>(T val) { return(val); } But both gave no errors compiling this:
2
7695
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:
0
2923
by: greek_bill | last post by:
Hi, I have a template function for which I use SFINAE to restrict one of the parameters. Then I also have a partial specialization of this function.I would like to provide an explicit instantiation of the partially specialized version, but my compiler (VC8) complains because it fails the SFINAE version. I just realized as I was typing this that I'm using partial _function_ specialization. I'm sure I remember reading somewhere that
0
8751
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,...
0
9108
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
8093
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
6702
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
6010
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();...
0
4781
by: adsilva | last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
1
3218
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
2
2632
muto222
by: muto222 | last post by:
How can i add a mobile payment intergratation into php mysql website.
3
2155
bsmnconsultancy
by: bsmnconsultancy | last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating effective websites that not only look great but also perform exceptionally well. In this comprehensive...

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.