Lightning Talk: C++20 - A New Way of Meta-Programming? - Kris Jusiak - CppCon 2022

Lightning Talk: C++20 - A New Way of Meta-Programming? - Kris Jusiak - CppCon 2022 https://github.com/CppCon/CppCon2022

https://www.youtube.com/watch?v=zRYlQGMdISI

Transcrição

Design by Inspection

consteval auto foo(auto t)
{
	if constexpr (requires{ t.foo; })
	{
		return t.foo;
	}
	else
	{
		return 0;
	}
	



}
int main() {
	constexpr struct { int foo{ 42 }; } f;
	static_assert(42 == foo(f));

	constexpr struct { int foo{ 42 }; } b;
	static_assert(0 == foo(b));

}

 01:12

2. Immediately-Invoked Function Expression (IIFE)

 02:08

 02:30

 03:33

 04:16

 04:59

 05:16