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Questions - variadic-templates

c++ completely generic event dispatcher

I try again to explain better again what I would achieve. I would like make a thing like this (inspired to Unity's UnityEvent): Public "variables" declared in some classes: GameEvent<>...
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ProtoTyPus

c++

templates

variadic-templates

variadic-functions

Votes: 0

Answers: 1

Latest Answer

What is wrong with the obvious way? void Notify(T... args) { // note: no need to write the type if it's quite long // note: & means the std::function isn't copied for (auto const& ...
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user253751

Template specialization and selection in variadic template class

I've a variadic templated class with some template specializations. I would like, for some specialization, to enable them conditionally (with std::enable_if, so I added a additional unused template pa...
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Vincent

c++

c++17

variadic-templates

sfinae

Votes: 0

Answers: 1

Latest Answer

For specialization B, you need to ensure that the conditions to std::enable_if are orthogonal. In your version, if you supply v=12 both conditions v!=11 and v==12 yield true, meaning that both version...
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Sedenion

C3520 parameter pack must be expanded - incorrect behaviour for &#39;variadic using&#39;

While compiling the code below with Qt 5.12 using Microsoft Visual C++ Compiler 15.9.28307.1300 (amd64) and c++17 standard I get the following error: error C3520: 'Args': parameter pack must be expan...
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Meliodas

c++

visual-c++

variadic-templates

Votes: 0

Answers: 1

Latest Answer

As workaround to variadic using (C++17), you might use the recursive way: template <typename... Args> class Helper; template <> class Helper<> { }; template <typename T> clas...
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Jarod42

C++ 17 Expand a Fold Expression (as pairs of values)

I am writing some code to experiment with fold expressions. I don't think my approach to solving this problem is the best possible approach. I am trying to write a function which "does something&...
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FreelanceConsultant

c++

c++17

variadic-templates

fold-expression

parameter-pack

Votes: 0

Answers: 3

Latest Answer

The problem can be "solved" by using a constexpr-if. But can it be done using the fold-expression? You can pack args... into a tuple and access the corresponding key and value by index, fo...
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