C++ Array vs Vector Benchmark

using Nuclex::Game::Timing::Clock;
using Nuclex::Support::Text::lexical_cast;
std::shared_ptr<Clock> clock(Clock::Create());

std::size_t testSize = 100000000;
if(commandLine == nullptr) {
  testSize += 1234; // fool the optimizer
}

// ---
std::uint64_t arrayStart = clock->GetTime();
{
  int *numbers2 = new int[testSize];
  for(std::size_t index = 0; index < testSize; ++index) {
    numbers2[index] = static_cast<int>(index);
  }
  delete[] numbers2;
}
std::uint64_t arrayEnd = clock->GetTime();

// ---
std::uint64_t vectorStart = clock->GetTime();
{
  std::vector<int> numbers(testSize);
  for(std::size_t index = 0; index < numbers.size(); ++index) {
    numbers[index] = static_cast<int>(index);
  }
}
std::uint64_t vectorEnd = clock->GetTime();


{
  std::uint64_t arrayDuration = arrayEnd - arrayStart;
  arrayDuration /= (clock->GetFrequency() / 1000);
  std::string message =
    std::string("Array duration: ") +
    lexical_cast<std::string>(arrayDuration) +
    std::string(" ms");
  OutputDebugStringA(message.c_str());
}

{
  std::uint64_t vectorDuration = vectorEnd - vectorStart;
  vectorDuration /= (clock->GetFrequency() / 1000);
  std::string message =
    std::string("Vector duration: ") +
    lexical_cast<std::string>(vectorDuration) +
    std::string(" ms");
  OutputDebugStringA(message.c_str());
}