public static FSharpOption <T> Where <T>(this FSharpOption <T> option, Func <T, bool> predicate)
{
if (option.HasValue() && predicate(option.Value))
{
return(option);
}
return(FSharpOption <T> .None);
}
/// <summary>
/// Converts this <see cref="FSharpOption{T}"/> to <see cref="Nullable{T}"/>
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="value"></param>
/// <returns></returns>
public static T?ToNullable <T>(this FSharpOption <T> value) where T : struct
{
if (!value.HasValue())
{
return(null);
}
return(value.Value);
}
public static FSharpOption <R> Select <T, R>(this FSharpOption <T> option, Func <T, R> selector)
{
if (!option.HasValue())
{
return(FSharpOption <R> .None);
}
return(selector(option.Value).ToOption());
}
public static Func <FSharpOption <T> > OrElse <T>(this FSharpOption <T> option, Func <FSharpOption <T> > alt)
{
return(() => {
if (option.HasValue())
{
return option;
}
return alt();
});
}
