logo
down
shadow

How do I alias a template specialization?


How do I alias a template specialization?

By : mr.anime northview
Date : November 17 2020, 01:00 AM
hope this fix your issue decltype() is a built-in operator, not a function from the std namespace like std::declval().
If you want to shorten the syntax with an alias template, you can declare one as shown below:
code :
#include <type_traits>    

template <typename C>
using IT = I<C, typename std::remove_reference<decltype(std::declval<C&>().fn(0))>::type>;

template <typename C>
IT<C> fn(C& c)
{
  return IT<C>(&c, c.fn(1));
}
template <typename C>
I<C, typename std::remove_reference<decltype(std::declval<C&>().fn(0))>::type> test();

template <typename C>
using IT = decltype(test<C>());

template <typename C>
IT<C> fn(C& c)
{
  return IT<C>(&c, c.fn(1));
}


Share : facebook icon twitter icon
Template specialization alias

Template specialization alias


By : Patricia mwangangi
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , Given legacy classes Scalar, Vector and Matrix, you could use inheritance:
code :
template<>
class Tensor<0>: public Scalar {};

template<>
class Tensor<1>: public Vector {};

template<>
class Tensor<2>: public Matrix {};
Alias template specialization issue?

Alias template specialization issue?


By : Jignesh Chudasama
Date : March 29 2020, 07:55 AM
Any of those help You have two errors in your code. The first, which you get, is that ratio_sum is not defined when you try to use it. The solution to this is simple: Switch place of the two definitions.
The second problem is that you can not use templates when defining a type alias in the case of ration_sum.
Template alias and specialization

Template alias and specialization


By : MindSpaceApocalypse
Date : March 29 2020, 07:55 AM
it should still fix some issue
14.5.7 Alias templates
code :
template< typename C >
struct IsFoo : std::false_type
{
};

template<class T>
struct IsFoo<Foo<T>> : std::true_type
{
};

static_assert( IsFoo<Foo<int>>::value,                             "Only foos!" );
static_assert( IsFoo< Pack<Foo>::Container<int> >::value,          "Only foos!" );
static_assert( IsFoo< Pack<Bar>::Container<int> >::value == false, "Not a foo!" );
template<class T>
void do_stuff(const T&) {}

template<class T>
void do_stuff(const Foo<T>&) {}
Alias to a function template specialization

Alias to a function template specialization


By : Djan Üah
Date : March 29 2020, 07:55 AM
I hope this helps you . There are some good approaches in the comments: std::bind, using a lambda, passing an instance of F into the function, so I'll provide an alternative.
If the function type that you will pass into foo will always be int(int, int), then you make the template parameter be a non-type template parameter, and then instantiate it with one of your functions:
code :
int f1(int a, int b) { std::cout<<"f1\n"; return a+b; }
int f2(int a, int b) { std::cout<<"f2\n"; return a*b; }

template <int(*F)(int, int)> 
void foo(int i, int j)
{
    F(i,j);   
}
int main()
{
    constexpr auto foo1 = foo<f1>;
    constexpr auto foo2 = foo<f2>;
    foo1(1,2);
    foo2(1,2);
}
Template specialization and alias template deduction difference

Template specialization and alias template deduction difference


By : user2726499
Date : March 29 2020, 07:55 AM
With these it helps I'm struggling to understand how deduction works in the following case: ,
Why a1 is not deduced in this context?
code :
template<class Category, Category code>
using A = typename AHelper<Category, code>::type;
template<Category code>
struct AHelper<int, code>
{
    using type = BImpl<code>; // My own class!
};
Related Posts Related Posts :
  • How to use SDL_MapRGB with SDL 2.0
  • how compiler and interpreter work in case of array declaration
  • GSL integration behaves strange
  • Cropping an image with OpenCV and C
  • Find the last line in text file and select the first 10 char and print to a new file?
  • Created many CCSprits but when triggering ccTouchBegan gives the last one allways
  • seekp and seekg don't work with fstream
  • Taking input in Sublime Text 3
  • ld: -bind_at_load and -bitcode_bundle (Xcode setting ENABLE_BITCODE=YES) cannot be used together
  • C++ storing #define as std::string would give size as zero compile time
  • How to use static linking with OpenSSL in C/C++
  • What is the difference between a trap, an error, a failure and program abortion?
  • Dynamic members allocation in qt
  • How to reduce object file size when compiling for VxWorks 5.5.1?
  • Printing char by integer qualifier
  • How to write code to be executed before main() gets control?
  • Blocking socket - waitForReadyRead()
  • std::string related errors and handling them, c++
  • VM interpreter - weighting performance benefits and drawbacks of larger instruction set / dispatch loop
  • C / C++ SHIFT / OFFSET / MOVE a Bitmap to the LEFT or RIGHT?
  • Printing numbers column by column
  • How do you change your app icon in visual studio 2013?
  • Fast Screen Transfer
  • c++ Read text file and input the numbers into a 2D array
  • Why are my C++ pointers suddenly diverging?
  • Is there a macro-based adapter to make a functor from a class?
  • CRTP and multilevel inheritance
  • How to implement timer for each object in c++?
  • Stuck when testing custom list class in c++
  • Using each member of class within one function to calculate average
  • check whether if two squares are intersecting with each other
  • Glm Quaternion lookat function
  • Is there guarantee heap allocated block address will not change(implicitly)?
  • Cosine Calculation without cmath library
  • Manually deleting a pointer returned by function
  • Avoid output interleaving
  • C++ error : Expected an identifier
  • Segmentation fault when I call operator new in linux mint
  • Recursively Solving A Sudoku Puzzle Using Backtracking Theoretically
  • lambda closure type and default argument in function template
  • How to ensure the function return consistent floating point values in C/C++?
  • What does throw do when not in used with try and catch?
  • The Unpredictablilty of the Order of Evaluation of Subexpressions
  • cannot convert const wchar_t to 'const_char' for argument 2 in MessageBOX etc etc
  • Size of a empty Class & Derived Virtual Class
  • unformatted i/o to and from memory
  • Storing an std::thread object as a class member
  • Remove duplicate string in an array
  • How to use copy_if() polymorphically?
  • How to organize a class's member functions?
  • How to wrap std::chrono in a c++ iterator type
  • Check if a socket is connected in mac os x
  • Grabbing the mouse cursor in GLFW
  • Calling Windows shell menu (same as right-click in Explorer) for multiple files programmatically
  • Pop up dialog to save file in seperate thread
  • Why would you use the keyword const if you already know variable should be constant?
  • Detecting Small Sound Effects In C++
  • How to avoid the copy when I return
  • Getting error code C2228: left of '._Ptr' must have class/struct/union
  • In win32 C++ programming how can I duplicate a window style?
  • shadow
    Privacy Policy - Terms - Contact Us © ourworld-yourmove.org