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-// Copyright 2008 Google Inc.
-// All Rights Reserved.
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-// * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-// * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-//
-// Author: wan@google.com (Zhanyong Wan)
-// Author: vladl@google.com (Vlad Losev)
-
-// This provides interface PrimeTable that determines whether a number is a
-// prime and determines a next prime number. This interface is used
-// in Google Test samples demonstrating use of parameterized tests.
-
-#ifndef GTEST_SAMPLES_PRIME_TABLES_H_
-#define GTEST_SAMPLES_PRIME_TABLES_H_
-
-#include <algorithm>
-
-// The prime table interface.
-class PrimeTable {
- public:
- virtual ~PrimeTable() {}
-
- // Returns true iff n is a prime number.
- virtual bool IsPrime(int n) const = 0;
-
- // Returns the smallest prime number greater than p; or returns -1
- // if the next prime is beyond the capacity of the table.
- virtual int GetNextPrime(int p) const = 0;
-};
-
-// Implementation #1 calculates the primes on-the-fly.
-class OnTheFlyPrimeTable : public PrimeTable {
- public:
- virtual bool IsPrime(int n) const {
- if (n <= 1) return false;
-
- for (int i = 2; i*i <= n; i++) {
- // n is divisible by an integer other than 1 and itself.
- if ((n % i) == 0) return false;
- }
-
- return true;
- }
-
- virtual int GetNextPrime(int p) const {
- for (int n = p + 1; n > 0; n++) {
- if (IsPrime(n)) return n;
- }
-
- return -1;
- }
-};
-
-// Implementation #2 pre-calculates the primes and stores the result
-// in an array.
-class PreCalculatedPrimeTable : public PrimeTable {
- public:
- // 'max' specifies the maximum number the prime table holds.
- explicit PreCalculatedPrimeTable(int max)
- : is_prime_size_(max + 1), is_prime_(new bool[max + 1]) {
- CalculatePrimesUpTo(max);
- }
- virtual ~PreCalculatedPrimeTable() { delete[] is_prime_; }
-
- virtual bool IsPrime(int n) const {
- return 0 <= n && n < is_prime_size_ && is_prime_[n];
- }
-
- virtual int GetNextPrime(int p) const {
- for (int n = p + 1; n < is_prime_size_; n++) {
- if (is_prime_[n]) return n;
- }
-
- return -1;
- }
-
- private:
- void CalculatePrimesUpTo(int max) {
- ::std::fill(is_prime_, is_prime_ + is_prime_size_, true);
- is_prime_[0] = is_prime_[1] = false;
-
- for (int i = 2; i <= max; i++) {
- if (!is_prime_[i]) continue;
-
- // Marks all multiples of i (except i itself) as non-prime.
- for (int j = 2*i; j <= max; j += i) {
- is_prime_[j] = false;
- }
- }
- }
-
- const int is_prime_size_;
- bool* const is_prime_;
-
- // Disables compiler warning "assignment operator could not be generated."
- void operator=(const PreCalculatedPrimeTable& rhs);
-};
-
-#endif // GTEST_SAMPLES_PRIME_TABLES_H_