| //===--- ContainerSizeEmptyCheck.h - clang-tidy -----------------*- C++ -*-===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_READABILITY_CONTAINERSIZEEMPTYCHECK_H |
| #define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_READABILITY_CONTAINERSIZEEMPTYCHECK_H |
| |
| #include "../ClangTidyCheck.h" |
| #include <vector> |
| |
| namespace clang::tidy::readability { |
| |
| /// Checks whether a call to the `size()`/`length()` method can be replaced with |
| /// a call to `empty()`. |
| /// |
| /// The emptiness of a container should be checked using the `empty()` method |
| /// instead of the `size()` method. It is not guaranteed that `size()` is a |
| /// constant-time function, and it is generally more efficient and also shows |
| /// clearer intent to use `empty()`. Furthermore some containers may implement |
| /// the `empty()` method but not implement the `size()` method. Using `empty()` |
| /// whenever possible makes it easier to switch to another container in the |
| /// future. |
| class ContainerSizeEmptyCheck : public ClangTidyCheck { |
| public: |
| ContainerSizeEmptyCheck(StringRef Name, ClangTidyContext *Context); |
| bool isLanguageVersionSupported(const LangOptions &LangOpts) const override { |
| return LangOpts.CPlusPlus; |
| } |
| void registerMatchers(ast_matchers::MatchFinder *Finder) override; |
| void check(const ast_matchers::MatchFinder::MatchResult &Result) override; |
| void storeOptions(ClangTidyOptions::OptionMap &Opts) override; |
| std::optional<TraversalKind> getCheckTraversalKind() const override { |
| return TK_IgnoreUnlessSpelledInSource; |
| } |
| |
| private: |
| std::vector<llvm::StringRef> ExcludedComparisonTypes; |
| }; |
| |
| } // namespace clang::tidy::readability |
| |
| #endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_READABILITY_CONTAINERSIZEEMPTYCHECK_H |