o3tl/qa/test-safeint.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  */
   9
  10 #include <sal/config.h>
  11
  12 #include <limits>
  13
  14 #include <cppunit/TestAssert.h>
  15 #include <cppunit/TestFixture.h>
  16 #include <cppunit/extensions/HelperMacros.h>
  17
  18 #include <o3tl/safeint.hxx>
  19
  20 namespace
  21 {
  22 class Test : public CppUnit::TestFixture
  23 {
  24 private:
  25     CPPUNIT_TEST_SUITE(Test);
  26     CPPUNIT_TEST(testSignedSaturatingAdd);
  27     CPPUNIT_TEST(testUnsignedSaturatingAdd);
  28     CPPUNIT_TEST_SUITE_END();
  29
  30     void testSignedSaturatingAdd()
  31     {
  32         auto const min = std::numeric_limits<int>::min();
  33         auto const max = std::numeric_limits<int>::max();
  34
  35         CPPUNIT_ASSERT_EQUAL(min, o3tl::saturating_add(min, min));
  36         CPPUNIT_ASSERT_EQUAL(min, o3tl::saturating_add(min, min + 1));
  37         CPPUNIT_ASSERT_EQUAL(min, o3tl::saturating_add(min, -1));
  38         CPPUNIT_ASSERT_EQUAL(min, o3tl::saturating_add(min, 0));
  39         CPPUNIT_ASSERT_EQUAL(min + 1, o3tl::saturating_add(min, 1));
  40         CPPUNIT_ASSERT_EQUAL(min + max - 1, o3tl::saturating_add(min, max - 1));
  41         CPPUNIT_ASSERT_EQUAL(min + max, o3tl::saturating_add(min, max));
  42
  43         CPPUNIT_ASSERT_EQUAL(min, o3tl::saturating_add(min + 1, min));
  44         CPPUNIT_ASSERT_EQUAL(min, o3tl::saturating_add(min + 1, min + 1));
  45         CPPUNIT_ASSERT_EQUAL(min, o3tl::saturating_add(min + 1, -1));
  46         CPPUNIT_ASSERT_EQUAL(min + 1, o3tl::saturating_add(min + 1, 0));
  47         CPPUNIT_ASSERT_EQUAL(min + 2, o3tl::saturating_add(min + 1, 1));
  48         CPPUNIT_ASSERT_EQUAL(min + max, o3tl::saturating_add(min + 1, max - 1));
  49         CPPUNIT_ASSERT_EQUAL(min + max + 1, o3tl::saturating_add(min + 1, max));
  50
  51         CPPUNIT_ASSERT_EQUAL(min, o3tl::saturating_add(-1, min));
  52         CPPUNIT_ASSERT_EQUAL(min, o3tl::saturating_add(-1, min + 1));
  53         CPPUNIT_ASSERT_EQUAL(-2, o3tl::saturating_add(-1, -1));
  54         CPPUNIT_ASSERT_EQUAL(-1, o3tl::saturating_add(-1, 0));
  55         CPPUNIT_ASSERT_EQUAL(0, o3tl::saturating_add(-1, 1));
  56         CPPUNIT_ASSERT_EQUAL(max - 2, o3tl::saturating_add(-1, max - 1));
  57         CPPUNIT_ASSERT_EQUAL(max - 1, o3tl::saturating_add(-1, max));
  58
  59         CPPUNIT_ASSERT_EQUAL(min, o3tl::saturating_add(0, min));
  60         CPPUNIT_ASSERT_EQUAL(min + 1, o3tl::saturating_add(0, min + 1));
  61         CPPUNIT_ASSERT_EQUAL(-1, o3tl::saturating_add(0, -1));
  62         CPPUNIT_ASSERT_EQUAL(0, o3tl::saturating_add(0, 0));
  63         CPPUNIT_ASSERT_EQUAL(1, o3tl::saturating_add(0, 1));
  64         CPPUNIT_ASSERT_EQUAL(max - 1, o3tl::saturating_add(0, max - 1));
  65         CPPUNIT_ASSERT_EQUAL(max, o3tl::saturating_add(0, max));
  66
  67         CPPUNIT_ASSERT_EQUAL(min + 1, o3tl::saturating_add(1, min));
  68         CPPUNIT_ASSERT_EQUAL(min + 2, o3tl::saturating_add(1, min + 1));
  69         CPPUNIT_ASSERT_EQUAL(0, o3tl::saturating_add(1, -1));
  70         CPPUNIT_ASSERT_EQUAL(1, o3tl::saturating_add(1, 0));
  71         CPPUNIT_ASSERT_EQUAL(2, o3tl::saturating_add(1, 1));
  72         CPPUNIT_ASSERT_EQUAL(max, o3tl::saturating_add(1, max - 1));
  73         CPPUNIT_ASSERT_EQUAL(max, o3tl::saturating_add(1, max));
  74
  75         CPPUNIT_ASSERT_EQUAL(min + max - 1, o3tl::saturating_add(max - 1, min));
  76         CPPUNIT_ASSERT_EQUAL(min + max, o3tl::saturating_add(max - 1, min + 1));
  77         CPPUNIT_ASSERT_EQUAL(max - 2, o3tl::saturating_add(max - 1, -1));
  78         CPPUNIT_ASSERT_EQUAL(max - 1, o3tl::saturating_add(max - 1, 0));
  79         CPPUNIT_ASSERT_EQUAL(max, o3tl::saturating_add(max - 1, 1));
  80         CPPUNIT_ASSERT_EQUAL(max, o3tl::saturating_add(max - 1, max - 1));
  81         CPPUNIT_ASSERT_EQUAL(max, o3tl::saturating_add(max - 1, max));
  82
  83         CPPUNIT_ASSERT_EQUAL(min + max, o3tl::saturating_add(max, min));
  84         CPPUNIT_ASSERT_EQUAL(min + max + 1, o3tl::saturating_add(max, min + 1));
  85         CPPUNIT_ASSERT_EQUAL(max - 1, o3tl::saturating_add(max, -1));
  86         CPPUNIT_ASSERT_EQUAL(max, o3tl::saturating_add(max, 0));
  87         CPPUNIT_ASSERT_EQUAL(max, o3tl::saturating_add(max, 1));
  88         CPPUNIT_ASSERT_EQUAL(max, o3tl::saturating_add(max, max - 1));
  89         CPPUNIT_ASSERT_EQUAL(max, o3tl::saturating_add(max, max));
  90     }
  91
  92     void testUnsignedSaturatingAdd()
  93     {
  94         auto const max = std::numeric_limits<unsigned int>::max();
  95
  96         CPPUNIT_ASSERT_EQUAL(0U, o3tl::saturating_add(0U, 0U));
  97         CPPUNIT_ASSERT_EQUAL(1U, o3tl::saturating_add(0U, 1U));
  98         CPPUNIT_ASSERT_EQUAL(max - 1, o3tl::saturating_add(0U, max - 1));
  99         CPPUNIT_ASSERT_EQUAL(max, o3tl::saturating_add(0U, max));
 100
 101         CPPUNIT_ASSERT_EQUAL(1U, o3tl::saturating_add(1U, 0U));
 102         CPPUNIT_ASSERT_EQUAL(2U, o3tl::saturating_add(1U, 1U));
 103         CPPUNIT_ASSERT_EQUAL(max, o3tl::saturating_add(1U, max - 1));
 104         CPPUNIT_ASSERT_EQUAL(max, o3tl::saturating_add(1U, max));
 105
 106         CPPUNIT_ASSERT_EQUAL(max - 1, o3tl::saturating_add(max - 1, 0U));
 107         CPPUNIT_ASSERT_EQUAL(max, o3tl::saturating_add(max - 1, 1U));
 108         CPPUNIT_ASSERT_EQUAL(max, o3tl::saturating_add(max - 1, max - 1));
 109         CPPUNIT_ASSERT_EQUAL(max, o3tl::saturating_add(max - 1, max));
 110
 111         CPPUNIT_ASSERT_EQUAL(max, o3tl::saturating_add(max, 0U));
 112         CPPUNIT_ASSERT_EQUAL(max, o3tl::saturating_add(max, 1U));
 113         CPPUNIT_ASSERT_EQUAL(max, o3tl::saturating_add(max, max - 1));
 114         CPPUNIT_ASSERT_EQUAL(max, o3tl::saturating_add(max, max));
 115     }
 116 };
 117
 118 CPPUNIT_TEST_SUITE_REGISTRATION(Test);
 119 }
 120
 121 /* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */