/// <summary>
/// Inserts the key-value pair into the symbol table, overwriting the old value
/// with the new value if the key is already in the symbol table.
/// If the value is <tt>null</tt>, this effectively deletes the key from the symbol table.
/// </summary>
/// <param name="key">key the key</param>
/// <param name="val">val the value</param>
/// <exception cref="NullReferenceException">if <tt>key</tt> is <tt>null</tt></exception>
public void Put(TKey key, TValue val)
{
if (key == null)
{
throw new NullReferenceException("called put() with null key");
}
if (val == null)
{
_st.Delete(key);
}
else
{
_st.Put(key, val);
}
}
/// <summary>
/// Removes the key from this set (if the key is present).
/// </summary>
/// <param name="key">key the key</param>
/// <exception cref="NullReferenceException">if <tt>key</tt> is <tt>null</tt></exception>
public void Delete(TKey key)
{
if (key == null)
{
throw new NullReferenceException("called delete() with a null key");
}
_set.Delete(key);
}
