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namespace MiscUtil
{
interface INullOp<T>
{
bool HasValue(T value);
bool AddIfNotNull(ref T accumulator, T value);
}
sealed class StructNullOp<T>
: INullOp<T>, INullOp<T?>
where T : struct
{
public bool HasValue(T value)
{
return true;
}
public bool AddIfNotNull(ref T accumulator, T value)
{
accumulator = Operator<T>.Add(accumulator, value);
return true;
}
public bool HasValue(T? value)
{
return value.HasValue;
}
public bool AddIfNotNull(ref T? accumulator, T? value)
{
if (value.HasValue)
{
accumulator = accumulator.HasValue ?
Operator<T>.Add(
accumulator.GetValueOrDefault(),
value.GetValueOrDefault())
: value;
return true;
}
return false;
}
}
sealed class ClassNullOp<T>
: INullOp<T>
where T : class
{
public bool HasValue(T value)
{
return value != null;
}
public bool AddIfNotNull(ref T accumulator, T value)
{
if (value != null)
{
accumulator = accumulator == null ?
value : Operator<T>.Add(accumulator, value);
return true;
}
return false;
}
}
}
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