[LAD] [semi-OT} c++20 concepts and syntax

Hey hey,
figuring out the syntax for c++20 concepts I run into challenges. With a two 
parameter template concept like swappable_with or convertible_to is it always 
necessary to use a requires statement like this:
template<typename T>
requires std::convertible_to<T,int>
void f(T t) ...
...

With single parameter concepts like integral a syntax like this will work:
template<std::integral T>
void f(T t)...

Also with single parameter concepts a statement like this should work:
std::integral auto my_variable;
Will that work with a two parameter concept like the above convertible_to? I 
haven't seen/found a syntax which does it.

Any help is appreciated, definitely including a good read that WILL 
demonstrate or demystify these things.

Best wishes,

Jeanette

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