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//===--- ContainerSizeEmptyCheck.h - clang-tidy -----------------*- C++ -*-===//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
#include "../ClangTidyCheck.h"
namespace clang {
namespace tidy {
namespace readability {
/// Checks whether a call to the `size()` 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 {
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;
llvm::Optional<TraversalKind> getCheckTraversalKind() const override {
return TK_IgnoreUnlessSpelledInSource;
} // namespace readability
} // namespace tidy
} // namespace clang