39 lines
1.5 KiB
C++
39 lines
1.5 KiB
C++
//===--- IncorrectRoundingsCheck.h - clang-tidy -----------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_BUGPRONE_INCORRECTROUNDINGSCHECK_H_
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#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_BUGPRONE_INCORRECTROUNDINGSCHECK_H_
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#include "../ClangTidyCheck.h"
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namespace clang {
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namespace tidy {
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namespace bugprone {
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/// Checks the usage of patterns known to produce incorrect rounding.
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/// Programmers often use
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/// (int)(double_expression + 0.5)
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/// to round the double expression to an integer. The problem with this
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/// 1. It is unnecessarily slow.
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/// 2. It is incorrect. The number 0.499999975 (smallest representable float
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/// number below 0.5) rounds to 1.0. Even worse behavior for negative
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/// numbers where both -0.5f and -1.4f both round to 0.0.
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class IncorrectRoundingsCheck : public ClangTidyCheck {
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public:
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IncorrectRoundingsCheck(StringRef Name, ClangTidyContext *Context)
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: ClangTidyCheck(Name, Context) {}
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void registerMatchers(ast_matchers::MatchFinder *Finder) override;
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void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
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};
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} // namespace bugprone
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} // namespace tidy
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} // namespace clang
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#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_BUGPRONE_INCORRECTROUNDINGSCHECK_H_
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