public ResultOrErrorDetails <TDestination> Map <TDestination>(Func <T, TDestination> mapper)
{
if (mapper == null)
{
throw new ArgumentNullException(nameof(mapper));
}
if (!_result.IsDefined)
{
if (typeof(T) == typeof(TDestination))
{
//@ return this;
}
return(ResultOrErrorDetails <TDestination> .FromError(_error.Value));
}
var newResult = mapper(_result.Value);
if (newResult == null)
{
throw new ArgumentException($"The provided {nameof(mapper)} returned null, which is not valid");
}
if ((typeof(T) == typeof(TDestination)) && newResult.Equals(_result.Value))
{
//@ return this;
}
return(new ResultOrErrorDetails <TDestination>(newResult, _error));
}
