tests/utils_tests.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 //
   3 // Copyright (c) 2015 Microsoft Corporation. All rights reserved.
   4 //
   5 // This code is licensed under the MIT License (MIT).
   6 //
   7 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   8 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   9 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  10 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  11 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  12 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  13 // THE SOFTWARE.
  14 //
  15 ///////////////////////////////////////////////////////////////////////////////
  16
  17 #include <gtest/gtest.h>
  18
  19 #include <algorithm>   // for move
  20 #include <complex>
  21 #include <cstddef>     // for std::ptrdiff_t
  22 #include <cstdint>     // for uint32_t, int32_t
  23 #include <functional>  // for reference_wrapper, _Bind_helper<>::type
  24 #include <gsl/narrow>  // for narrow, narrowing_error
  25 #include <gsl/util>    // finally, narrow_cast
  26 #include <limits>      // for numeric_limits
  27 #include <type_traits> // for is_same
  28
  29 using namespace gsl;
  30
  31 namespace
  32 {
  33 void f(int& i) { i += 1; }
  34 static int j = 0;
  35 void g() { j += 1; }
  36 } // namespace
  37
  38 TEST(utils_tests, sanity_check_for_gsl_index_typedef)
  39 {
  40     static_assert(std::is_same<gsl::index, std::ptrdiff_t>::value,
  41                   "gsl::index represents wrong arithmetic type");
  42 }
  43
  44 TEST(utils_tests, finally_lambda)
  45 {
  46     int i = 0;
  47     {
  48         auto _ = finally([&]() { f(i); });
  49         EXPECT_TRUE(i == 0);
  50     }
  51     EXPECT_TRUE(i == 1);
  52 }
  53
  54 TEST(utils_tests, finally_lambda_move)
  55 {
  56     int i = 0;
  57     {
  58         auto _1 = finally([&]() { f(i); });
  59         {
  60             auto _2 = std::move(_1);
  61             EXPECT_TRUE(i == 0);
  62         }
  63         EXPECT_TRUE(i == 1);
  64         {
  65             auto _2 = std::move(_1);
  66             EXPECT_TRUE(i == 1);
  67         }
  68         EXPECT_TRUE(i == 1);
  69     }
  70     EXPECT_TRUE(i == 1);
  71 }
  72
  73 TEST(utils_tests, finally_const_lvalue_lambda)
  74 {
  75     int i = 0;
  76     {
  77         const auto const_lvalue_lambda = [&]() { f(i); };
  78         auto _ = finally(const_lvalue_lambda);
  79         EXPECT_TRUE(i == 0);
  80     }
  81     EXPECT_TRUE(i == 1);
  82 }
  83
  84 TEST(utils_tests, finally_mutable_lvalue_lambda)
  85 {
  86     int i = 0;
  87     {
  88         auto mutable_lvalue_lambda = [&]() { f(i); };
  89         auto _ = finally(mutable_lvalue_lambda);
  90         EXPECT_TRUE(i == 0);
  91     }
  92     EXPECT_TRUE(i == 1);
  93 }
  94
  95 TEST(utils_tests, finally_function_with_bind)
  96 {
  97     int i = 0;
  98     {
  99         auto _ = finally([&i] { return f(i); });
 100         EXPECT_TRUE(i == 0);
 101     }
 102     EXPECT_TRUE(i == 1);
 103 }
 104
 105 TEST(utils_tests, finally_function_ptr)
 106 {
 107     j = 0;
 108     {
 109         auto _ = finally(&g);
 110         EXPECT_TRUE(j == 0);
 111     }
 112     EXPECT_TRUE(j == 1);
 113 }
 114
 115 TEST(utils_tests, finally_function)
 116 {
 117     j = 0;
 118     {
 119         auto _ = finally(g);
 120         EXPECT_TRUE(j == 0);
 121     }
 122     EXPECT_TRUE(j == 1);
 123 }
 124
 125 TEST(utils_tests, narrow_cast)
 126 {
 127     int n = 120;
 128     char c = narrow_cast<char>(n);
 129     EXPECT_TRUE(c == 120);
 130
 131     n = 300;
 132     unsigned char uc = narrow_cast<unsigned char>(n);
 133     EXPECT_TRUE(uc == 44);
 134 }
 135
 136 #ifndef GSL_KERNEL_MODE
 137 TEST(utils_tests, narrow)
 138 {
 139     int n = 120;
 140     const char c = narrow<char>(n);
 141     EXPECT_TRUE(c == 120);
 142
 143     n = 300;
 144     EXPECT_THROW(narrow<char>(n), narrowing_error);
 145
 146     const auto int32_max = std::numeric_limits<int32_t>::max();
 147     const auto int32_min = std::numeric_limits<int32_t>::min();
 148
 149     EXPECT_TRUE(narrow<uint32_t>(int32_t(0)) == 0);
 150     EXPECT_TRUE(narrow<uint32_t>(int32_t(1)) == 1);
 151     EXPECT_TRUE(narrow<uint32_t>(int32_max) == static_cast<uint32_t>(int32_max));
 152
 153     EXPECT_THROW(narrow<uint32_t>(int32_t(-1)), narrowing_error);
 154     EXPECT_THROW(narrow<uint32_t>(int32_min), narrowing_error);
 155
 156     n = -42;
 157     EXPECT_THROW(narrow<unsigned>(n), narrowing_error);
 158
 159     EXPECT_TRUE(
 160         narrow<std::complex<float>>(std::complex<double>(4, 2)) == std::complex<float>(4, 2));
 161     EXPECT_THROW(narrow<std::complex<float>>(std::complex<double>(4.2)), narrowing_error);
 162
 163     EXPECT_TRUE(narrow<int>(float(1)) == 1);
 164 }
 165 #endif // GSL_KERNEL_MODE