policy_tests.cpp

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#include <tsl/robin_growth_policy.h>
 
#include <boost/mpl/list.hpp>
#include <boost/test/unit_test.hpp>
#include <cstddef>
#include <limits>
#include <ratio>
#include <stdexcept>
 
#include "utils.h"
 
BOOST_AUTO_TEST_SUITE(test_policy)
 
using test_types =
    boost::mpl::list<tsl::rh::power_of_two_growth_policy<2>,
                     tsl::rh::power_of_two_growth_policy<4>,
                     tsl::rh::prime_growth_policy, tsl::rh::mod_growth_policy<>,
                     tsl::rh::mod_growth_policy<std::ratio<7, 2>>>;
 
BOOST_AUTO_TEST_CASE_TEMPLATE(test_policy, Policy, test_types) {
  // Call next_bucket_count() on the policy until we reach its
  // max_bucket_count()
  std::size_t bucket_count = 0;
  Policy policy(bucket_count);
 
  BOOST_CHECK_EQUAL(policy.bucket_for_hash(0), 0);
  BOOST_CHECK_EQUAL(bucket_count, 0);
 
#ifndef TSL_RH_NO_EXCEPTIONS
  bool exception_thrown = false;
  try {
    while (true) {
      const std::size_t previous_bucket_count = bucket_count;
 
      bucket_count = policy.next_bucket_count();
      policy = Policy(bucket_count);
 
      BOOST_CHECK_EQUAL(policy.bucket_for_hash(0), 0);
      BOOST_CHECK(bucket_count > previous_bucket_count);
    }
  } catch (const std::length_error&) {
    exception_thrown = true;
  }
 
  BOOST_CHECK(exception_thrown);
#endif
}
 
BOOST_AUTO_TEST_CASE_TEMPLATE(test_policy_min_bucket_count, Policy,
                              test_types) {
  // Check policy when a bucket_count of 0 is asked.
  std::size_t bucket_count = 0;
  Policy policy(bucket_count);
 
  BOOST_CHECK_EQUAL(policy.bucket_for_hash(0), 0);
}
 
BOOST_AUTO_TEST_CASE_TEMPLATE(test_policy_max_bucket_count, Policy,
                              test_types) {
  // Test a bucket_count equals to the max_bucket_count limit and above
  std::size_t bucket_count = 0;
  Policy policy(bucket_count);
 
  bucket_count = policy.max_bucket_count();
  Policy policy2(bucket_count);
 
  bucket_count = std::numeric_limits<std::size_t>::max();
  TSL_RH_CHECK_THROW((Policy(bucket_count)), std::length_error);
 
  bucket_count = policy.max_bucket_count() + 1;
  TSL_RH_CHECK_THROW((Policy(bucket_count)), std::length_error);
}
 
BOOST_AUTO_TEST_SUITE_END()