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Teuchos_HashUtils.cpp
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00041 
00042 #include "Teuchos_HashUtils.hpp"
00043 #include "Teuchos_Assert.hpp"
00044 
00045 using namespace Teuchos;
00046 
00047 
00048 const int HashUtils::primeCount_ = 33;
00049 const int HashUtils::primes_[] 
00050 = {11, 19, 37, 59, 101, 163, 271, 443, 733, 1187, 1907, 3061, 
00051    4919, 7759, 12379, 19543, 30841, 48487, 75989, 
00052    119089, 185971, 290347, 452027, 703657, 1093237,
00053    1695781, 2627993, 4067599, 6290467, 9718019, 
00054    15000607, 23133937, 35650091};
00055 
00056 
00057 int HashUtils::nextPrime(int newCapacity) 
00058 {
00059   TEUCHOS_TEST_FOR_EXCEPTION(newCapacity > primes_[primeCount_-1],
00060                      std::logic_error,
00061                      "HashUtils::nextPrime() overflow");
00062 
00063   for (int i=0; i<primeCount_; i++)
00064     {
00065       if (newCapacity <= primes_[i])
00066         {
00067           return primes_[i];
00068         }
00069     }
00070 
00071   TEUCHOS_TEST_FOR_EXCEPTION(true,
00072                      std::logic_error,
00073                      "unexpected case in HashUtils::nextPrime()");
00074   return 0;
00075 }
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