auxiliary-iterator-functions-next-prev.cpp

#define CATCH_CONFIG_MAIN
#include <iterator>

#include "catch.hpp"

TEST_CASE("next returns iterators at given offsets") {
  std::vector<unsigned char> mission{0x9e, 0xc4, 0xc1, 0x29, 0x49, 0xa4,
                                     0xf3, 0x14, 0x74, 0xf2, 0x99, 0x05,
                                     0x8c, 0xe2, 0xb2, 0x2a};
  auto itr1 = mission.begin();
  std::advance(itr1, 4);
  REQUIRE(*itr1 == 0x49);

  auto itr2 = std::next(itr1);
  REQUIRE(*itr2 == 0xa4);

  auto itr3 = std::next(itr1, 4);
  REQUIRE(*itr3 == 0x74);

  REQUIRE(*itr1 == 0x49);
}