Testing if an expression has side effects at compile time

[Florian Weimer]

* Alejandro Colomar via Gcc:

> If there's no way, it would be interesting to add compound literals of
> function type to achieve this:
>
> 	#define strnulD(...)                                          \
> 	((static inline auto                                          \
> 	  (auto s))                                                   \
> 	{                                                             \
> 		return s + strlen(s);                                 \
> 	}(__VA_ARGS__))

This already works:

static inline auto
strnulD (auto s)
{
  return s + strlen (s);
}

No need to invent new syntax for it.

Thanks,
Florian