copt-solver 0.1.1

An unofficial Rust API for COPT (Cardinal Optimizer)
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use std::ffi;

/// The error type for operations in Gurobi Rust API
#[derive(Debug)]
pub enum Error {
  /// An exception returned from COPT C API
  FromAPI(ffi::c_int),

  /// See https://doc.rust-lang.org/std/ffi/struct.NulError.html
  NulError(std::ffi::NulError),

  /// Inconsistent argument dimensions
  InconsitentDims,
}

impl From<std::ffi::NulError> for Error {
    fn from(err: std::ffi::NulError) -> Error { Error::NulError(err) }
  }
  
  impl std::fmt::Display for Error {
    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
      match *self {
        Error::FromAPI(code) => write!(f, "Error code from API: {}",code),
        Error::InconsitentDims => write!(f, "Inconsistent argument dimensions"),
        Error::NulError(ref err) => write!(f, "NulError: {}", err),
      }
    }
  }
  
  // impl std::error::Error for Error {
  //   fn description(&self) -> &str {
  //     match *self {
  //       Error::FromAPI(..) => "error from C API",
  //       Error::NulError(ref err) => err.description(),
  //       Error::InconsitentDims => "Inconsistent argument dimensions",
  //     }
  //   }
  // }
  
  
  /// A specialized
  /// [`Result`](https://doc.rust-lang.org/std/result/enum.Result.html)
  /// type for operations in Gurobi Rust API
  pub type Result<T> = std::result::Result<T, Error>;