xieite::any::operator T()

Defined in fragment xieite:any
(header-only: <xieite/meta/any.hpp>)

A declared cast operator of xieite::any to any other type. Must be used in unevaluated context, as it is not actually implemented.

This is not marked constexpr because it would otherwise have to be [implicitly instantiated if the existence of its definition affects the semantics of the program] if it is [needed for constant evaluation (even if not required)] if this function is [named by an expression that is potentially constant evaluated] if the expression is [an immediate subexpression of a brace initializer list].
Basically, this function would behave differently in a case like int { xieite::any() }.

Declaration

 
template<typename T>
explicit(false) operator T() const noexcept;


Example

 
import xieite;

void f(int, float, char16_t***&&) {}

int main() {
	xieite::any any;

	// Check if `f` is callable with three arguments of any type
	xieite::dump(requires { f(any, any, any); });
}
Output: 
true
[View in Compiler Explorer]