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1//===----------------------------------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_BUGPRONE_INCORRECTROUNDINGSCHECK_H_10#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_BUGPRONE_INCORRECTROUNDINGSCHECK_H_11 12#include "../ClangTidyCheck.h"13 14namespace clang::tidy::bugprone {15 16/// Checks the usage of patterns known to produce incorrect rounding.17/// Programmers often use18/// (int)(double_expression + 0.5)19/// to round the double expression to an integer. The problem with this20/// 1. It is unnecessarily slow.21/// 2. It is incorrect. The number 0.499999975 (smallest representable float22/// number below 0.5) rounds to 1.0. Even worse behavior for negative23/// numbers where both -0.5f and -1.4f both round to 0.0.24class IncorrectRoundingsCheck : public ClangTidyCheck {25public:26 IncorrectRoundingsCheck(StringRef Name, ClangTidyContext *Context)27 : ClangTidyCheck(Name, Context) {}28 void registerMatchers(ast_matchers::MatchFinder *Finder) override;29 void check(const ast_matchers::MatchFinder::MatchResult &Result) override;30};31 32} // namespace clang::tidy::bugprone33 34#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_BUGPRONE_INCORRECTROUNDINGSCHECK_H_35