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In our codebase we use std::variant<std::shared_ptr<SomeClass>, ...> a lot.
That obviously requires a lot of writing. How to make a template?
template <class... T>
using VarSP = std::variant<std::shared_ptr<???>>;
Where should T go in the above snippet?
The desired behavior should be:
VarSP<Foo, Bar, Baz> // std::variant<std::shared_ptr<Foo>, std::shared_ptr<Bar>, std::shared_ptr<Baz>>
351
C++ Templates: Templates with Multiple Parameters | C++ Tutorials for Beginners #65.
A template parameter is a special kind of parameter that can be used to pass a type as argument: just like regular function parameters can be used to pass values to a function, template parameters allow to pass also types to a function.
Non-type template arguments are normally used to initialize a class or to specify the sizes of class members. For non-type integral arguments, the instance argument matches the corresponding template parameter as long as the instance argument has a value and sign appropriate to the parameter type.
A variable template may be introduced by a template declaration at namespace scope, where variable-declaration declares a variable. When used at class scope, variable template declares a static data member template.
template <typename... T>
using VarSP = std::variant<std::shared_ptr<T>...>;
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