/// <summary>
/// Tries to get value from Dictionary safely
/// </summary>
/// <typeparam name="TK"></typeparam>
/// <typeparam name="T"></typeparam>
/// <param name="dictionary"></param>
/// <param name="key"></param>
/// <returns></returns>
public static Maybe <T> Lookup <TK, T>(this IDictionary <TK, T> dictionary, TK key)
{
Contract.Requires(dictionary != null);
var getter = MaybeFunctionalWrappers.Wrap <TK, T>(dictionary.TryGetValue);
return(getter(key));
}
/// <summary>
/// Tries to get value from Dictionary safely
/// </summary>
/// <typeparam name="TK"></typeparam>
/// <typeparam name="T"></typeparam>
/// <param name="dictionary"></param>
/// <param name="key"></param>
/// <returns></returns>
public static Maybe <T> Lookup <TK, T>(this IDictionary <TK, T> dictionary, TK key)
{
if (dictionary == null)
{
throw new ArgumentNullException("dictionary");
}
var getter = MaybeFunctionalWrappers.Wrap <TK, T>(dictionary.TryGetValue);
return(getter(key));
}
/// <summary>
/// Tries to get value from Dictionary safely
/// </summary>
/// <typeparam name="TK"></typeparam>
/// <typeparam name="T"></typeparam>
/// <param name="dictionary"></param>
/// <param name="key"></param>
/// <returns></returns>
public static Maybe <T> Lookup <TK, T>(this IDictionary <TK, T> dictionary, TK key)
{
var getter = MaybeFunctionalWrappers.Wrap <TK, T>(dictionary.TryGetValue);
return(getter(key));
}
/// <summary>
/// If <paramref name="a"/> can be successfully casted to <typeparamref name="TR"/>, returns the casted one, wrapped as Maybe<TR>, otherwise Nothing
/// </summary>
/// <typeparam name="T"></typeparam>
/// <typeparam name="TR"></typeparam>
/// <param name="a"></param>
/// <returns></returns>
public static Maybe <TR> MaybeCast <T, TR>(this T a) where TR : T
{
return(MaybeFunctionalWrappers.Catcher <T, TR, InvalidCastException>(o => (TR)o)(a));
}
