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69 lines
1.7 KiB
C++
69 lines
1.7 KiB
C++
/**
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* Copyright (C) 2008 10gen Inc.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License, version 3,
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "stdafx.h"
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#include "goodies.h"
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Nullstream nullstream;
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Logstream logstream;
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boost::mutex Logstream::mutex;
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unsigned occasion = 0;
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bool goingAway = false;
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bool isPrime(int n) {
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int z = 2;
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while( 1 ) {
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if( z*z > n )
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break;
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if( n % z == 0 )
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return false;
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z++;
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}
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return true;
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}
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int nextPrime(int n) {
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n |= 1; // 2 goes to 3...don't care...
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while( !isPrime(n) )
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n += 2;
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return n;
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}
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struct UtilTest {
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UtilTest() {
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assert( WrappingInt(0) <= WrappingInt(0) );
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assert( WrappingInt(0) <= WrappingInt(1) );
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assert( !(WrappingInt(1) <= WrappingInt(0)) );
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assert( (WrappingInt(0xf0000000) <= WrappingInt(0)) );
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assert( (WrappingInt(0xf0000000) <= WrappingInt(9000)) );
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assert( !(WrappingInt(300) <= WrappingInt(0xe0000000)) );
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assert( tdiff(3, 4) == 1 );
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assert( tdiff(4, 3) == -1 );
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assert( tdiff(0xffffffff, 0) == 1 );
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assert( isPrime(3) );
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assert( isPrime(2) );
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assert( isPrime(13) );
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assert( isPrime(17) );
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assert( !isPrime(9) );
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assert( !isPrime(6) );
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assert( nextPrime(4) == 5 );
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assert( nextPrime(8) == 11 );
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}
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} utilTest;
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