Function std::intrinsics::size_of_val

pub const unsafe extern "rust-intrinsic" fn size_of_val<T>(*const T) -> usize where
    T: ?Sized, 

🔬 This is a nightly-only experimental API. (core_intrinsics)

intrinsics are unlikely to ever be stabilized, instead they should be used through stabilized interfaces in the rest of the standard library

引用值的大小 (以字节为单位)。

此内联函数的稳定版本为 mem::size_of_val。