llvm/clang-tools-extra/clang-tidy/llvm/PreferIsaOrDynCastInConditionalsCheck.h

//===--- PreferIsaOrDynCastInConditionalsCheck.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_LLVM_PREFERISAORDYNCASTINCONDITIONALSCHECK_H
#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_LLVM_PREFERISAORDYNCASTINCONDITIONALSCHECK_H

#include "../ClangTidyCheck.h"

namespace clang::tidy::llvm_check {

/// Looks at conditionals and finds and replaces cases of ``cast<>``, which will
/// assert rather than return a null pointer, and ``dyn_cast<>`` where
/// the return value is not captured.  Additionally, finds and replaces cases that match the
/// pattern ``var && isa<X>(var)``, where ``var`` is evaluated twice.
///
/// Finds cases like these:
/// \code
///  if (auto x = cast<X>(y)) {}
///  // is replaced by:
///  if (auto x = dyn_cast<X>(y)) {}
///
///  if (cast<X>(y)) {}
///  // is replaced by:
///  if (isa<X>(y)) {}
///
///  if (dyn_cast<X>(y)) {}
///  // is replaced by:
///  if (isa<X>(y)) {}
///
///  if (var && isa<T>(var)) {}
///  // is replaced by:
///  if (isa_and_nonnull<T>(var.foo())) {}
/// \endcode
///
///  // Other cases are ignored, e.g.:
/// \code
///  if (auto f = cast<Z>(y)->foo()) {}
///  if (cast<Z>(y)->foo()) {}
///  if (X.cast(y)) {}
/// \endcode
///
/// For the user-facing documentation see:
/// http://clang.llvm.org/extra/clang-tidy/checks/llvm/prefer-isa-or-dyn-cast-in-conditionals.html
class PreferIsaOrDynCastInConditionalsCheck : public ClangTidyCheck { … };

} // namespace clang::tidy::llvm_check

#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_LLVM_PREFERISAORDYNCASTINCONDITIONALSCHECK_H