Consider this simple self-contained code: template<typename T> void foo(); void bar() { int i; auto l = [&i]() -> decltype(auto) { decltype(auto) x = i; foo<decltype(x)>(); ...

decltype(auto) func(int&& n) { return (n); } clang 12.0.1 accepts this code, but gcc 11.2.1 rejects it with: error: cannot bind rvalue reference of type 'int&&' to lvalue of type ...

(This is a follow-up from "Are there any realistic use cases for `decltype(auto)` variables?") Consider the following scenario - I want to pass a function f to another function invoke_log_return w...

I am trying to make template wrapper function, that should forward parameters and return value. And I can't decide what is better to use auto&& or decltype(auto) for return type. I've read ...

I am learning C++17 new feature decltype(auto) for non-type template parameter. I wrote a simple code snippet as following: #include <type_traits> template<decltype(auto) arg> struct F...

Both from my personal experience and from consulting answers to questions like What are some uses of decltype(auto)? I can find plenty of valuable use cases for decltype(auto) as a function return ...

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...