decltype – IT Nursery

Arrow operator (->) in function heading

June 4, 2022 by IT Nursery

I came across the following code: template <typename T, typename T1> auto compose(T a, T1 b) -> decltype(a + b) { return a+b; } There is one thing I cannot understand: Where could I find out what the arrow operator (->) means in the function heading? I guess purely logically, that the -> operator determines … Read more

What are some uses of decltype(auto)?

June 3, 2022 by IT Nursery

In c++14 the decltype(auto) idiom is introduced. Typically its use is to allow auto declarations to use the decltype rules on the given expression. Searching for examples of “good” usage of the idiom I can only think of things like the following (by Scott Meyers), namely for a function’s return type deduction: template<typename ContainerType, typename … Read more