| // Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you under the Apache License, Version 2.0 (the |
| // "License"); you may not use this file except in compliance |
| // with the License. You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, |
| // software distributed under the License is distributed on an |
| // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| // KIND, either express or implied. See the License for the |
| // specific language governing permissions and limitations |
| // under the License. |
| |
| #include <stdint.h> |
| |
| // Must come before gtest.h. |
| #include "kudu/gutil/mathlimits.h" |
| |
| #include <gtest/gtest.h> |
| #include "kudu/util/safe_math.h" |
| |
| namespace kudu { |
| template<typename T> |
| static void DoTest(T a, T b, bool expected) { |
| SCOPED_TRACE(a); |
| SCOPED_TRACE(b); |
| bool overflow = false; |
| T ret = AddWithOverflowCheck(a, b, &overflow); |
| EXPECT_EQ(overflow, expected); |
| if (!overflow) { |
| EXPECT_EQ(ret, a + b); |
| } |
| } |
| |
| TEST(TestSafeMath, TestSignedInts) { |
| // Overflow above max of range. |
| DoTest<int32_t>(MathLimits<int32_t>::kMax - 10, 15, true); |
| DoTest<int32_t>(MathLimits<int32_t>::kMax - 10, 10, false); |
| |
| // Underflow around negative |
| DoTest<int32_t>(MathLimits<int32_t>::kMin + 10, -15, true); |
| DoTest<int32_t>(MathLimits<int32_t>::kMin + 10, -5, false); |
| |
| } |
| |
| TEST(TestSafeMath, TestUnsignedInts) { |
| // Overflow above max |
| DoTest<uint32_t>(MathLimits<uint32_t>::kMax - 10, 15, true); |
| DoTest<uint32_t>(MathLimits<uint32_t>::kMax - 10, 10, false); |
| } |
| |
| } // namespace kudu |