Combine two ints into a long without using chars or strings.

Hi
I have two ints and i need to combine (not add) them into a long value. The reason for this is because I need the make keys for a DB containing both values.
eg.
int1 = 3567453647
int2= 6368535795
long combination = combine(int1, int2);
and the value of combination should be 35674536476368535795
I know you can doing it by turning the ints into strings, combining the strings and then using the combined string as intput to a new Long(String) but I really need a faster way using pure maths (maybe bit shift?) as this combination function will be used billions of times.
Thanks
Edited by: user8908143 on 29-Sep-2010 19:52

It's also a good way to get rid of boneheaded comments once one realizes how boneheaded they were. :-)A posteriori editing is another way :o)
[OT: Forum features and moderators] A posteriori edition ( self- or mod- )
Edited by: jduprez on Sep 30, 2010 6:21 PM
That being said (and mocked), the binary shift left solution seems correct (although I'd definitely go for a custom class and double-column key instead).

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