text: ///////////////////////////////////////////////////////////////////////////////
  //
  // Copyright (c) 2015 Microsoft Corporation. All rights reserved.
  //
  // This code is licensed under the MIT License (MIT).
  //
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  // THE SOFTWARE.
  //
  ///////////////////////////////////////////////////////////////////////////////
  
  #include <UnitTest++/UnitTest++.h>
  
  #include <gsl/gsl>
  
  #include <functional>
  
  using namespace gsl;
  
  SUITE(utils_tests)
  {
      void f(int& i) { i += 1; }
  
      TEST(finally_lambda)
      {
          int i = 0;
          {
              auto _ = finally([&]() { f(i); });
              CHECK(i == 0);
          }
          CHECK(i == 1);
      }
  
      TEST(finally_lambda_move)
      {
          int i = 0;
          {
              auto _1 = finally([&]() { f(i); });
              {
                  auto _2 = std::move(_1);
                  CHECK(i == 0);
              }
              CHECK(i == 1);
              {
                  auto _2 = std::move(_1);
                  CHECK(i == 1);
              }
              CHECK(i == 1);
          }
          CHECK(i == 1);
      }
  
      TEST(finally_function_with_bind)
      {
          int i = 0;
          {
              auto _ = finally(std::bind(&f, std::ref(i)));
              CHECK(i == 0);
          }
          CHECK(i == 1);
      }
  
      int j = 0;
      void g() { j += 1; }
      TEST(finally_function_ptr)
      {
          j = 0;
          {
              auto _ = finally(&g);
              CHECK(j == 0);
          }
          CHECK(j == 1);
      }
  
      TEST(narrow_cast)
      {
          int n = 120;
          char c = narrow_cast<char>(n);
          CHECK(c == 120);
  
          n = 300;
          unsigned char uc = narrow_cast<unsigned char>(n);
          CHECK(uc == 44);
      }
  
      TEST(narrow)
      {
          int n = 120;
          const char c = narrow<char>(n);
          CHECK(c == 120);
  
          n = 300;
          CHECK_THROW(narrow<char>(n), narrowing_error);
  
          const auto int32_max = std::numeric_limits<int32_t>::max();
          const auto int32_min = std::numeric_limits<int32_t>::min();
  
          CHECK(narrow<uint32_t>(int32_t(0)) == 0);
          CHECK(narrow<uint32_t>(int32_t(1)) == 1);
          CHECK(narrow<uint32_t>(int32_max) == static_cast<uint32_t>(int32_max));
  
          CHECK_THROW(narrow<uint32_t>(int32_t(-1)), narrowing_error);
          CHECK_THROW(narrow<uint32_t>(int32_min), narrowing_error);
  
          n = -42;
          CHECK_THROW(narrow<unsigned>(n), narrowing_error);
      }
  }
  
  int main(int, const char* []) { return UnitTest::RunAllTests(); }
  