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I don't really see the point when C++ already lets you write

void foo(auto& t) { t.bar(); }

which can be called with any class that has the .bar() method anyway.

Because it can also be called with any class that doesn't have the bar method, and good luck deciphering the compiler error for it when it's nested 3 levels deep into some far corner of the STL.

That is what concepts fix. It lets you enforce at build time that `t` does have member `.bar()`.

man I love learning good stuff by casually learning HN. I code on cpp as a hobby and kinda new you could use "auto" on templates by didn't know about this.

Check out concepts. That allows you to enforce the existence of the function. Also works with static functions and such.

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