public bool TryGetFirst(out KeyValuePair <K, Vdest> value)
{
KeyValuePair <K, Vsrc> srcVal;
var res = _innerMap.TryGetFirst(out srcVal);
if (res)
{
value = new KeyValuePair <K, Vdest>(srcVal.Key, _srcToDest(srcVal.Value));
}
else
{
value = default(KeyValuePair <K, Vdest>);
}
return(res);
}
