Partial template specialization: matching on properties of specialized template parameter

Posted by Kenzo on Stack Overflow See other posts from Stack Overflow or by Kenzo
Published on 2010-05-29T06:13:04Z Indexed on 2010/05/29 6:22 UTC
Read the original article Hit count: 384

Filed under:

c++

|

sfinae

|

partial-specialization

|

template-templates

template <typename X, typename Y> class A {};
enum Property {P1,P2};
template <Property P> class B {};
class C {};

Is there any way to define a partial specialization of A such that A<C, B<P1> > would be A's normal template, but A<C, B<P2> > would be the specialization?

Replacing the Y template parameter by a template template parameter would be nice, but is there a way to partially specialize it based on P then?

template <typename X, template <Property P> typename Y> class A {};
// template <typename X> class A<X,template<> Y<P2> > {}; <-- not valid

Is there a way by adding traits to a specialization template<> B<P2> and then using SFINAE in A?

© Stack Overflow or respective owner

Related posts about c++

C++ : C++ Primer (Stanley Lipmann) or The C++ programming language (special edition)

as seen on Stack Overflow - Search for 'Stack Overflow'
I have a Computer Science degree (long2 time ago) .. I do know Java OOP but i am now trying to pick up C++. I do have C and of course data structure using C or pascal. I have started reading Bjarne Stroustrup book (The C++ Programming Language - Special Edition) but find it extremely difficult esp… >>> More
Which C++ book shold I get between "C++ Primer" vs "C++ Primer Plus"

as seen on Stack Overflow - Search for 'Stack Overflow'
I want to learn C++ by using Vim and MinGW as compiler. I'm interesting at "C++ Primer (4th Edition)" and "C++ Primer Plus (5th Edition)" but I don't know how about it different. It has no book store that I can review those books, so I want to know, what is the different between those book and which… >>> More
Managed c++ std::string not accessible in unmanaged c++

as seen on Stack Overflow - Search for 'Stack Overflow'
In unmanaged c++ dll i have a function which takes constant std::string as argument Prototype : void read ( const std::string &imageSpec_ ) I call this function from managed c++ dll by passing a std::string. When i debug the unmanaged c++ code the parameter imageSpec_ shows the value correctly… >>> More
I need help on my C++ assignment using MS Visual C++

as seen on Stack Overflow - Search for 'Stack Overflow'
Ok, so I don't want you to do my homework for me, but I'm a little lost with this final assignment and need all the help I can get. Learning about programming is tough enough, but doing it online is next to impossible for me... Now, to get to the program, I am going to paste what I have so far. This… >>> More
The Definitive C++ Book Guide and List

as seen on Stack Overflow - Search for 'Stack Overflow'
After more than a few questions about deciding on C++ books I thought we could make a better community wiki version. Providing QUALITY books and an approximate skill level. Maybe we can add a short blurb/description about each book that you have personally read / benefited from. Feel free to debate… >>> More

Related posts about sfinae

SFINAE failing with enum template parameter

as seen on Stack Overflow - Search for 'Stack Overflow'
Can someone explain the following behaviour (I'm using Visual Studio 2010). header: #pragma once #include <boost\utility\enable_if.hpp> using boost::enable_if_c; enum WeekDay {MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY, SUNDAY}; template<WeekDay DAY> typename enable_if_c<… >>> More
Why does SFINAE not apply to this?

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm writing some simple point code while trying out Visual Studio 10 (Beta 2), and I've hit this code where I would expect SFINAE to kick in, but it seems not to: template<typename T> struct point { T x, y; point(T x, T y) : x(x), y(y) {} }; template<typename T, typename U> struct… >>> More
SFINAE + sizeof = detect if expression compiles

as seen on Stack Overflow - Search for 'Stack Overflow'
I just found out how to check if operator<< is provided for a type. template<class T> T& lvalue_of_type(); template<class T> T rvalue_of_type(); template<class T> struct is_printable { template<class U> static char test(char(*)[sizeof( lvalue_of_type<std::ostream>()… >>> More
Multiple SFINAE rules

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi everyone, After reading the answer to this question, I learned that SFINAE can be used to choose between two functions based on whether the class has a certain member function. It's the equivalent of the following, just that each branch in the if statement is split into an overloaded function: template<typename… >>> More
How to determine whether a class has a particular templated member function?

as seen on Stack Overflow - Search for 'Stack Overflow'
I was wondering if it's possible to extend the SFINAE approach to detecting whether a class has a certain member function (as discussed here: "Is there a Technique in C++ to know if a class has a member function of a given signature?" http://stackoverflow.com/questions/87372/is-there-a-technique-in-c-to-know-if-a-class-has-a-member-function-of-a-given-s )… >>> More