1//===--- IncorrectRoundingsCheck.h - clang-tidy -----------------*- C++ -*-===//
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-exception
6//
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 use
18/// (int)(double_expression + 0.5)
19/// to round the double expression to an integer. The problem with this
20/// 1. It is unnecessarily slow.
21/// 2. It is incorrect. The number 0.499999975 (smallest representable float
22/// number below 0.5) rounds to 1.0. Even worse behavior for negative
23/// 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::bugprone
33
34#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_BUGPRONE_INCORRECTROUNDINGSCHECK_H_
35

source code of clang-tools-extra/clang-tidy/bugprone/IncorrectRoundingsCheck.h