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Abstract: Class Template Argument Deduction (CTAD) is a very useful C++ language feature that was added in C++17. In this talk, I will present how CATD lets you write cleaner and shorter code, show how it interacts with the C++ standard library, explain when and how user-defined deduction guides should be used, cover
15 Mar 2017 Template deduction guides are patterns associated with a template class that tell the compiler how to translate a set of parameter (and their types) into template arguments. The simplest example is that of std::vector and its constructor that takes an iterator pair. template<typename Iterator> void func(Iterator first, Iterator last)
User defined deduction guides have to be defined in the same scope as the class template they apply to. They look pretty similar to the pseudo code I wrote above for the automatic guides. A user-defined version of the deduction guide that replaces make_pair would
26 Jun 2017 But does it mean C++17 doesn't improve templates/template meta-programming? BTW: if you're really brave you can still use concepts! Also if you're adventurous you can create your custom class template deduction guides: see here for more information: recent post: Arne Mertz: Modern C++ Features
6 Feb 2017 This paper discusses possible extensions to template argument deduction for class templates as described in P0091R3. Please see that paper Indeed, we contend that supporting = delete for deduction guides not only increases consistency but has worthwhile use cases as well. Consider the following
9 Jan 2017 For a braced-init-list with only a single element, auto deduction will deduce from that entry;; For a braced-init-list with more than one element, auto Normal type parameters can use them interchangeably, but template template parameters were restricted to class , so this change unifies these forms
The syntax of a user-defined deduction guide is the syntax of a function declaration with a trailing return type, except that it uses the name of a class template as the function name:
21 Nov 2017 User-defined deduction guides look like constructors with return types declared. They are of the following general form: template<{TemplateParameters>ClassTemplateName(ConstructorParameters) -> ClassTemplateSpecialization; Reference: en.cppreference.com/w/cpp/language/
11 Jan 2017 pair a{0, 42.42}; std::tuple t{"hi", 15, std::vector<int>{}};. This feature is supported through a new concept known as deduction guides, which tell the compiler how to deduce template arguments for the template class from the constructor arguments. These can be implicitly synthesized, or explicitly specified.
29 Nov 2016 C++17's automatic class template deduction feature brings with it a new sub-feature called “deduction guides" which are used to help the compiler with class template type deduction. Jason gives examples of what they are and how they are used in this episode.
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