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use std::error::Error as StdError; use std::fmt; use foreign_types::ForeignType; #[derive(Debug, Copy, Clone, Eq, PartialEq)] pub enum Error { ObjectCreationError, MissingData, InvalidString, } impl Error { pub unsafe fn if_null<T>(handle: *mut <T as ForeignType>::CType) -> LCMSResult<T> where T: ForeignType { if !handle.is_null() { Ok(T::from_ptr(handle)) } else { Err(Error::ObjectCreationError) } } } pub type LCMSResult<T> = Result<T, Error>; impl fmt::Display for Error { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { f.write_str(self.description()) } } impl StdError for Error { fn description(&self) -> &str { match *self { Error::ObjectCreationError => "Could not create the object.\nThe reason is not known, but it's usually caused by wrong input parameters.", Error::InvalidString => "String is not valid. Contains unsupported characters or is too long.", Error::MissingData => "Requested data is empty or does not exist.", } } }