public static ICountableCollection <T> Select <T>(this ICountableCollection <T> collection, Func <T, T> transformer)
{
var result = new CountableCollection <T>();
foreach (KeyValuePair <T, int> keyValuePair in collection)
{
result.Add(transformer(keyValuePair.Key), keyValuePair.Value);
}
return(result);
}
public bool TryExchange(IDecreasingOrderCollection <int> availableValues, int valueForExchange, out ICountableCollection <int> result)
{
result = new CountableCollection <int>();
foreach (int availableValue in availableValues.DecreasingOrder())
{
if (valueForExchange == 0)
{
return(true);
}
if (valueForExchange >= availableValue)
{
valueForExchange -= availableValue;
result.Add(availableValue, 1);
}
}
return(valueForExchange == 0);
}
