Issue by Virtlink
Sunday Apr 24, 2016 at 11:12 GMT
Originally opened as gsscoder/commandline#310

The Parser.ParseArguments() overloads with a factory function has this signature:

public ParserResult<T> ParseArguments<T>(Func<T> factory, IEnumerable<string> args)
    where T : new()

If I provide my own factory function, why does T need to have a public parameterless constructor (new())?

var result = parser.ParseArguments<Options>(() => new Options(true), args);

And on the other hand, why doesn't the non-factory overload of ParseArguments not require a public parameterless constructor? This will cause a runtime-exception when T doesn't have a public parameterless constructor.

var result = parser.ParseArguments<Options>(args);