//[NotNull, Pure]
//private static DesignByContractViolationException CreateEnumException<T>([NotNull] object value, [CanBeNull] string name = null)
//{
// string enumType = typeof(T).Name;
// string enumValue = value.ToString();
// name = name ?? "enum";
// return new DesignByContractViolationException($"Unsupported {name} value: {enumValue} ({enumType})");
//}
/// <summary>
/// Checks whether specified value can be used as (cast to) an enum value.
/// </summary>
/// <typeparam name="T">Type of enum to check</typeparam>
/// <param name="value">Value of enum to check</param>
public static void IfEnumNotDefined <T>([NotNull][System.Diagnostics.CodeAnalysis.NotNull] object value)
{
if (Enum.IsDefined(typeof(T), value) == false)
{
throw Fail.Because(Violation.WhenEnumOutOfRange <T>(null, value));
}
}
/// <summary>
/// Checks whether specified enum value is defined.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="value"></param>
public static void IfEnumNotDefined <T>(T value) where T : struct
{
// ReSharper disable once HeapView.BoxingAllocation
if (Enum.IsDefined(typeof(T), value) == false)
{
throw Fail.Because(Violation.WhenEnumOutOfRange <T>(null, value));
}
}
public static T CastEnumOrFail <T>([CanBeNull][NoEnumeration] this Enum value, [NotNull][System.Diagnostics.CodeAnalysis.NotNull] string name)
{
Fail.RequiresArgumentName(name);
Type type = value.GetType();
if (Enum.IsDefined(type, value) == false)
{
throw Fail.Because(Violation.WhenEnumOutOfRange <T>(name, value));
}
return(value.CastOrFail <T>(name));
}
public static DesignByContractViolationException BecauseEnumOutOfRange <T>(T value)
where T : struct
{
// ReSharper disable once HeapView.BoxingAllocation
return(Fail.Because(Violation.WhenEnumOutOfRange <T>(null, value)));
}