objc2_core_foundation

Function CFNumberFormatterCreateStringWithValue

Source 
pub unsafe extern "C-unwind" fn CFNumberFormatterCreateStringWithValue(
    allocator: Option<&CFAllocator>,
    formatter: Option<&CFNumberFormatter>,
    number_type: CFNumberType,
    value_ptr: *const c_void,
) -> Option<CFRetained<CFString>>
Available on crate features CFBase and CFNumber and CFNumberFormatter only.