I've got these very clearly defined methods that internally all call InternalGreaterThan()
but can't find a way - without removing the T
constraint - of making this work for long?
and DataTime?
#nullable enable
public static bool GreaterThan(long? @this, long? value)
{
return InternalGreaterThan(@this, value);
}
public static bool GreaterThan(DateTime? @this, DateTime? value)
{
return InternalGreaterThan(@this, value);
}
public static bool GreaterThan(Version? @this, Version? value)
{
return InternalGreaterThan(@this, value);
}
private static bool InternalGreaterThan<T>(T @this, T value) where T : IComparable<T>?
{
return @this != null && value != null && Comparer<T>.Default.Compare(@this, value) > 0;
}
What are my options here without having to remove the T
constraint (although altering the constraint is of course fine).
You need two separate overloads. One for T
and one for T?
. Eg:
private static bool InternalGreaterThan<T>(T @this, T value) where T : IComparable<T>
{
return Comparer<T>.Default.Compare(@this, value) > 0;
}
private static bool InternalGreaterThan<T>(T? @this, T? value) where T : struct, IComparable<T>
{
return @this.HasValue && value.HasValue && InternalGreaterThan(@this.Value, value.Value);
}
You cannot do that. Assuming, you can. Than it is possible to make a call like this:
DateTime? dt = null;
var result = dt.GreaterThan(null);
The system is unable to detect the argument's type. Which version of the method the system should take?
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