std::mem_fn will effectively give you the underlying function that takes a pointer. Strictly speaking mem_fn is defined to generate the wrapper function, but in practice the optimizer is just going to strip that away and call the name-mangled function directly.

Example: https://godbolt.org/z/6Y1raxMce

You can just use member function pointers without the wrapper. The syntax for calling them is a bit uglier though.

Yup, but then the call syntax is different so it fails to achieve the "Universal Function Call Syntax" that OP was asking for which std::mem_fn provides.

Whoa, this is really cool, thanks for posting

Yeah, UFCS remains illusive, but tantalizingly close. It's pretty easy to make

``` struct foo { void bar(); }

bar(foo* i) { assert(i != nullptr); i->bar(); } ```

work, but there's enough syntactic complexity in the language that it isn't as easy as it should be.

It's a 1-liner with std::mem_fn

Indeed.