https://github.com/vbvictor created
https://github.com/llvm/llvm-project/pull/121291
Add new clang-tidy check that finds potentially erroneous calls to ``reset()``
method on smart pointers when
the pointee type also has a ``reset()`` method.
It's easy to make typo and delete object because the difference between ``.``
and ``->`` is really small.
Sometimes IDE's autocomplete will change ``->`` to ``.`` automatically. For
example, developer wrote ``ptr->res`` but after _Tab_ it became ``ptr.reset()``.
Small example:
```cpp
struct Resettable {
void reset() { /* Own reset logic */ }
};
auto ptr = std::make_unique<Resettable>();
ptr->reset(); // Calls underlying reset method
ptr.reset(); // Makes the pointer null
// After Fix-its
(*ptr).reset(); // Clearly calls underlying reset method
ptr = nullptr; // Clearly makes the pointer null
```
>From 37dce6a7ed0cca2e9819c24f4d176c43e3c9f2ac Mon Sep 17 00:00:00 2001
From: Victor Baranov <bar.victor.2...@gmail.com>
Date: Sun, 29 Dec 2024 15:32:22 +0300
Subject: [PATCH] [clang-tidy] Add bugprone-reset-call check
---
.../bugprone/BugproneTidyModule.cpp | 2 +
.../clang-tidy/bugprone/CMakeLists.txt | 1 +
.../clang-tidy/bugprone/ResetCallCheck.cpp | 133 +++++++++++
.../clang-tidy/bugprone/ResetCallCheck.h | 34 +++
clang-tools-extra/docs/ReleaseNotes.rst | 6 +
.../clang-tidy/checks/bugprone/reset-call.rst | 33 +++
.../docs/clang-tidy/checks/list.rst | 1 +
.../checkers/bugprone/reset-call.cpp | 215 ++++++++++++++++++
8 files changed, 425 insertions(+)
create mode 100644 clang-tools-extra/clang-tidy/bugprone/ResetCallCheck.cpp
create mode 100644 clang-tools-extra/clang-tidy/bugprone/ResetCallCheck.h
create mode 100644
clang-tools-extra/docs/clang-tidy/checks/bugprone/reset-call.rst
create mode 100644
clang-tools-extra/test/clang-tidy/checkers/bugprone/reset-call.cpp
diff --git a/clang-tools-extra/clang-tidy/bugprone/BugproneTidyModule.cpp
b/clang-tools-extra/clang-tidy/bugprone/BugproneTidyModule.cpp
index 33ac65e715ce81..645958e47e22a5 100644
--- a/clang-tools-extra/clang-tidy/bugprone/BugproneTidyModule.cpp
+++ b/clang-tools-extra/clang-tidy/bugprone/BugproneTidyModule.cpp
@@ -57,6 +57,7 @@
#include "PosixReturnCheck.h"
#include "RedundantBranchConditionCheck.h"
#include "ReservedIdentifierCheck.h"
+#include "ResetCallCheck.h"
#include "ReturnConstRefFromParameterCheck.h"
#include "SharedPtrArrayMismatchCheck.h"
#include "SignalHandlerCheck.h"
@@ -144,6 +145,7 @@ class BugproneModule : public ClangTidyModule {
"bugprone-inaccurate-erase");
CheckFactories.registerCheck<IncorrectEnableIfCheck>(
"bugprone-incorrect-enable-if");
+ CheckFactories.registerCheck<ResetCallCheck>("bugprone-reset-call");
CheckFactories.registerCheck<ReturnConstRefFromParameterCheck>(
"bugprone-return-const-ref-from-parameter");
CheckFactories.registerCheck<SwitchMissingDefaultCaseCheck>(
diff --git a/clang-tools-extra/clang-tidy/bugprone/CMakeLists.txt
b/clang-tools-extra/clang-tidy/bugprone/CMakeLists.txt
index 13adad7c3dadbd..17ab5b27ec5550 100644
--- a/clang-tools-extra/clang-tidy/bugprone/CMakeLists.txt
+++ b/clang-tools-extra/clang-tidy/bugprone/CMakeLists.txt
@@ -52,6 +52,7 @@ add_clang_library(clangTidyBugproneModule STATIC
PosixReturnCheck.cpp
RedundantBranchConditionCheck.cpp
ReservedIdentifierCheck.cpp
+ ResetCallCheck.cpp
ReturnConstRefFromParameterCheck.cpp
SharedPtrArrayMismatchCheck.cpp
SignalHandlerCheck.cpp
diff --git a/clang-tools-extra/clang-tidy/bugprone/ResetCallCheck.cpp
b/clang-tools-extra/clang-tidy/bugprone/ResetCallCheck.cpp
new file mode 100644
index 00000000000000..305ac8d51adf3e
--- /dev/null
+++ b/clang-tools-extra/clang-tidy/bugprone/ResetCallCheck.cpp
@@ -0,0 +1,133 @@
+//===--- ResetCallCheck.cpp - clang-tidy
----------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "ResetCallCheck.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/ASTMatchers/ASTMatchFinder.h"
+#include "clang/ASTMatchers/ASTMatchers.h"
+#include "clang/Lex/Lexer.h"
+
+using namespace clang::ast_matchers;
+
+namespace clang::tidy::bugprone {
+
+namespace {
+
+AST_MATCHER_P(CallExpr, everyArgumentMatches,
+ ast_matchers::internal::Matcher<Expr>, InnerMatcher) {
+ if (Node.getNumArgs() == 0)
+ return true;
+
+ for (const auto *Arg : Node.arguments()) {
+ if (!InnerMatcher.matches(*Arg, Finder, Builder))
+ return false;
+ }
+ return true;
+}
+
+AST_MATCHER(CXXMethodDecl, hasOnlyDefaultArgs) {
+ if (Node.param_empty())
+ return true;
+
+ for (const auto *Param : Node.parameters()) {
+ if (!Param->hasDefaultArg())
+ return false;
+ }
+ return true;
+}
+
+} // namespace
+
+void ResetCallCheck::registerMatchers(MatchFinder *Finder) {
+ const auto IsSmartptr = hasAnyName("::std::unique_ptr", "::std::shared_ptr");
+
+ const auto ResetMethod =
+ cxxMethodDecl(hasName("reset"), hasOnlyDefaultArgs());
+
+ const auto TypeWithReset =
+ anyOf(cxxRecordDecl(hasMethod(ResetMethod)),
+ classTemplateSpecializationDecl(
+ hasSpecializedTemplate(classTemplateDecl(has(ResetMethod)))));
+
+ const auto SmartptrWithBugproneReset = classTemplateSpecializationDecl(
+ IsSmartptr,
+ hasTemplateArgument(
+ 0, templateArgument(refersToType(hasUnqualifiedDesugaredType(
+ recordType(hasDeclaration(TypeWithReset)))))));
+
+ // Find a.reset() calls
+ Finder->addMatcher(
+ cxxMemberCallExpr(callee(memberExpr(member(hasName("reset")))),
+ everyArgumentMatches(cxxDefaultArgExpr()),
+ on(expr(hasType(SmartptrWithBugproneReset))))
+ .bind("smartptrResetCall"),
+ this);
+
+ // Find a->reset() calls
+ Finder->addMatcher(
+ cxxMemberCallExpr(
+ callee(memberExpr(
+ member(ResetMethod),
+ hasObjectExpression(
+ cxxOperatorCallExpr(
+ hasOverloadedOperatorName("->"),
+ hasArgument(
+ 0, expr(hasType(
+
classTemplateSpecializationDecl(IsSmartptr)))))
+ .bind("OpCall")))),
+ everyArgumentMatches(cxxDefaultArgExpr()))
+ .bind("objectResetCall"),
+ this);
+}
+
+void ResetCallCheck::check(const MatchFinder::MatchResult &Result) {
+ const auto *SmartptrResetCall =
+ Result.Nodes.getNodeAs<CXXMemberCallExpr>("smartptrResetCall");
+ const auto *ObjectResetCall =
+ Result.Nodes.getNodeAs<CXXMemberCallExpr>("objectResetCall");
+
+ if (SmartptrResetCall) {
+ const auto *Member = cast<MemberExpr>(SmartptrResetCall->getCallee());
+
+ auto DiagBuilder = diag(SmartptrResetCall->getBeginLoc(),
+ "bugprone 'reset()' call on smart pointer");
+
+ DiagBuilder << FixItHint::CreateReplacement(
+ SourceRange(Member->getOperatorLoc(),
+ Member->getOperatorLoc().getLocWithOffset(0)),
+ " =");
+
+ DiagBuilder << FixItHint::CreateReplacement(
+ SourceRange(Member->getMemberLoc(), SmartptrResetCall->getEndLoc()),
+ " nullptr");
+ }
+
+ if (ObjectResetCall) {
+ const auto *Arrow = Result.Nodes.getNodeAs<CXXOperatorCallExpr>("OpCall");
+
+ const auto SmartptrSourceRange =
+ Lexer::getAsCharRange(Arrow->getArg(0)->getSourceRange(),
+ *Result.SourceManager, getLangOpts());
+
+ auto DiagBuilder = diag(ObjectResetCall->getBeginLoc(),
+ "bugprone 'reset()' call on smart pointer");
+
+ DiagBuilder << FixItHint::CreateInsertion(SmartptrSourceRange.getBegin(),
+ "(*");
+ DiagBuilder << FixItHint::CreateInsertion(SmartptrSourceRange.getEnd(),
+ ")");
+
+ DiagBuilder << FixItHint::CreateReplacement(
+ CharSourceRange::getCharRange(
+ Arrow->getOperatorLoc(),
+ Arrow->getOperatorLoc().getLocWithOffset(2)),
+ ".");
+ }
+}
+
+} // namespace clang::tidy::bugprone
diff --git a/clang-tools-extra/clang-tidy/bugprone/ResetCallCheck.h
b/clang-tools-extra/clang-tidy/bugprone/ResetCallCheck.h
new file mode 100644
index 00000000000000..18f6ee4f6bed22
--- /dev/null
+++ b/clang-tools-extra/clang-tidy/bugprone/ResetCallCheck.h
@@ -0,0 +1,34 @@
+//===--- ResetCallCheck.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_BUGPRONE_RESETCALLCHECK_H
+#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_BUGPRONE_RESETCALLCHECK_H
+
+#include "../ClangTidyCheck.h"
+
+namespace clang::tidy::bugprone {
+
+/// Finds potentially erroneous calls to 'reset()' method on smart pointers
when
+/// the pointee type also has a 'reset()' method
+///
+/// For the user-facing documentation see:
+/// http://clang.llvm.org/extra/clang-tidy/checks/bugprone/reset-call.html
+class ResetCallCheck : public ClangTidyCheck {
+public:
+ ResetCallCheck(StringRef Name, ClangTidyContext *Context)
+ : ClangTidyCheck(Name, Context) {}
+ void registerMatchers(ast_matchers::MatchFinder *Finder) override;
+ void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
+ bool isLanguageVersionSupported(const LangOptions &LangOpts) const override {
+ return LangOpts.CPlusPlus;
+ }
+};
+
+} // namespace clang::tidy::bugprone
+
+#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_BUGPRONE_RESETCALLCHECK_H
diff --git a/clang-tools-extra/docs/ReleaseNotes.rst
b/clang-tools-extra/docs/ReleaseNotes.rst
index fa3a8e577a33ad..d125afef0bb039 100644
--- a/clang-tools-extra/docs/ReleaseNotes.rst
+++ b/clang-tools-extra/docs/ReleaseNotes.rst
@@ -148,6 +148,12 @@ New checks
Finds nondeterministic usages of pointers in unordered containers.
+- New :doc:`bugprone-reset-call
+ <clang-tidy/checks/bugprone/reset-call>` check.
+
+ Finds potentially erroneous calls to ``reset()`` method on smart pointers
when
+ the pointee type also has a ``reset()`` method.
+
- New :doc:`bugprone-tagged-union-member-count
<clang-tidy/checks/bugprone/tagged-union-member-count>` check.
diff --git a/clang-tools-extra/docs/clang-tidy/checks/bugprone/reset-call.rst
b/clang-tools-extra/docs/clang-tidy/checks/bugprone/reset-call.rst
new file mode 100644
index 00000000000000..87cf955b26b648
--- /dev/null
+++ b/clang-tools-extra/docs/clang-tidy/checks/bugprone/reset-call.rst
@@ -0,0 +1,33 @@
+.. title:: clang-tidy - bugprone-reset-call
+
+bugprone-reset-call
+===================
+
+Finds calls to ``reset()`` method on smart pointers where the pointee type
+also has a ``reset()`` method, which makes it easy to accidentally
+make the pointer null when intending to reset the underlying object.
+
+.. code-block:: c++
+
+ struct Resettable {
+ void reset() { /* Own reset logic */ }
+ };
+
+ auto ptr = std::make_unique<Resettable>();
+
+ ptr->reset(); // Calls underlying reset method
+ ptr.reset(); // Makes the pointer null
+
+Both calls are valid C++ code, but the second one might not be
+what the developer intended, as it destroys the pointed-to object
+rather than resetting its state.
+It's easy to make such typo because the difference between ``.`` and ``->`` is
really small.
+
+The recommended approach is to make the intent explicit by using either member
access or direct assignment:
+
+.. code-block:: c++
+
+ std::unique_ptr<Resettable> ptr = std::make_unique<Resettable>();
+
+ (*ptr).reset(); // Clearly calls underlying reset method
+ ptr = nullptr; // Clearly makes the pointer null
\ No newline at end of file
diff --git a/clang-tools-extra/docs/clang-tidy/checks/list.rst
b/clang-tools-extra/docs/clang-tidy/checks/list.rst
index 4d8853a0f6d86c..9ca866da74666d 100644
--- a/clang-tools-extra/docs/clang-tidy/checks/list.rst
+++ b/clang-tools-extra/docs/clang-tidy/checks/list.rst
@@ -124,6 +124,7 @@ Clang-Tidy Checks
:doc:`bugprone-posix-return <bugprone/posix-return>`, "Yes"
:doc:`bugprone-redundant-branch-condition
<bugprone/redundant-branch-condition>`, "Yes"
:doc:`bugprone-reserved-identifier <bugprone/reserved-identifier>`, "Yes"
+ :doc:`bugprone-reset-call <bugprone/reset-call>`, "Yes"
:doc:`bugprone-return-const-ref-from-parameter
<bugprone/return-const-ref-from-parameter>`,
:doc:`bugprone-shared-ptr-array-mismatch
<bugprone/shared-ptr-array-mismatch>`, "Yes"
:doc:`bugprone-signal-handler <bugprone/signal-handler>`,
diff --git a/clang-tools-extra/test/clang-tidy/checkers/bugprone/reset-call.cpp
b/clang-tools-extra/test/clang-tidy/checkers/bugprone/reset-call.cpp
new file mode 100644
index 00000000000000..d98f4b463840c7
--- /dev/null
+++ b/clang-tools-extra/test/clang-tidy/checkers/bugprone/reset-call.cpp
@@ -0,0 +1,215 @@
+// RUN: %check_clang_tidy %s bugprone-reset-call %t
+
+namespace std {
+
+template <typename T>
+struct unique_ptr {
+ T& operator*() const;
+ T* operator->() const;
+ void reset(T* p = nullptr);
+};
+
+template <typename T>
+struct shared_ptr {
+ T& operator*() const;
+ T* operator->() const;
+ void reset();
+ void reset(T*);
+};
+
+} // namespace std
+
+struct Resettable {
+ void reset();
+ void doSomething();
+};
+
+struct ResettableWithParam {
+ void reset(int a);
+ void doSomething();
+};
+
+struct ResettableWithDefaultParams {
+ void reset(int a = 0, double b = 0.0);
+ void doSomething();
+};
+
+struct NonResettable {
+ void doSomething();
+};
+
+void Positive() {
+ std::unique_ptr<Resettable> u;
+ u.reset();
+ // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: bugprone 'reset()' call on smart
pointer
+ // CHECK-FIXES: u = nullptr;
+ u->reset();
+ // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: bugprone 'reset()' call on smart
pointer
+ // CHECK-FIXES: (*u).reset();
+
+ std::shared_ptr<Resettable> s;
+ s.reset();
+ // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: bugprone 'reset()' call on smart
pointer
+ // CHECK-FIXES: s = nullptr;
+ s->reset();
+ // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: bugprone 'reset()' call on smart
pointer
+ // CHECK-FIXES: (*s).reset();
+
+ std::unique_ptr<std::unique_ptr<int>> uu_ptr;
+ uu_ptr.reset();
+ // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: bugprone 'reset()' call on smart
pointer
+ // CHECK-FIXES: uu_ptr = nullptr;
+ uu_ptr->reset();
+ // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: bugprone 'reset()' call on smart
pointer
+ // CHECK-FIXES: (*uu_ptr).reset();
+
+ std::unique_ptr<std::shared_ptr<int>> su_ptr;
+ su_ptr.reset();
+ // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: bugprone 'reset()' call on smart
pointer
+ // CHECK-FIXES: su_ptr = nullptr;
+ su_ptr->reset();
+ // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: bugprone 'reset()' call on smart
pointer
+ // CHECK-FIXES: (*su_ptr).reset();
+
+ std::unique_ptr<ResettableWithDefaultParams> rd;
+ rd.reset();
+ // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: bugprone 'reset()' call on smart
pointer
+ // CHECK-FIXES: rd = nullptr;
+ rd->reset();
+ // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: bugprone 'reset()' call on smart
pointer
+ // CHECK-FIXES: (*rd).reset();
+
+ std::unique_ptr<std::shared_ptr<std::unique_ptr<Resettable>>> nested_ptr;
+ nested_ptr.reset();
+ // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: bugprone 'reset()' call on smart
pointer
+ // CHECK-FIXES: nested_ptr = nullptr;
+ nested_ptr->reset();
+ // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: bugprone 'reset()' call on smart
pointer
+ // CHECK-FIXES: (*nested_ptr).reset();
+ (*nested_ptr).reset();
+ // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: bugprone 'reset()' call on smart
pointer
+ // CHECK-FIXES: (*nested_ptr) = nullptr;
+ (*nested_ptr)->reset();
+ // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: bugprone 'reset()' call on smart
pointer
+ // CHECK-FIXES: (*(*nested_ptr)).reset();
+ (**nested_ptr).reset();
+ // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: bugprone 'reset()' call on smart
pointer
+ // CHECK-FIXES: (**nested_ptr) = nullptr;
+ (**nested_ptr)->reset();
+ // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: bugprone 'reset()' call on smart
pointer
+ // CHECK-FIXES: (*(**nested_ptr)).reset();
+}
+
+void Negative() {
+ std::unique_ptr<Resettable> u_ptr;
+ u_ptr.reset(nullptr);
+ u_ptr->doSomething();
+
+ std::shared_ptr<Resettable> s_ptr;
+ s_ptr.reset(nullptr);
+ s_ptr->doSomething();
+
+ Resettable* raw_ptr;
+ raw_ptr->reset();
+ raw_ptr->doSomething();
+
+ Resettable resettable;
+ resettable.reset();
+ resettable.doSomething();
+
+ std::unique_ptr<ResettableWithParam> u_ptr_param;
+ u_ptr_param.reset();
+ u_ptr_param.reset(nullptr);
+ u_ptr_param->reset(0);
+
+ std::unique_ptr<NonResettable> u_ptr_no_reset;
+ u_ptr_no_reset.reset();
+
+ std::shared_ptr<ResettableWithParam> s_ptr_param;
+ s_ptr_param.reset();
+ s_ptr_param->reset(0);
+ s_ptr_param->doSomething();
+
+ std::shared_ptr<NonResettable> s_ptr_no_reset;
+ s_ptr_no_reset.reset();
+
+ std::unique_ptr<ResettableWithDefaultParams> u_ptr_default_params;
+ u_ptr_default_params.reset(nullptr);
+ u_ptr_default_params->reset(1);
+ u_ptr_default_params->reset(1, 2.0);
+}
+
+template <typename T>
+void TemplatePositiveTest() {
+ std::unique_ptr<T> u_ptr;
+
+ u_ptr.reset();
+ // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: bugprone 'reset()' call on smart
pointer
+ // CHECK-FIXES: u_ptr = nullptr;
+ u_ptr->reset();
+ // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: bugprone 'reset()' call on smart
pointer
+ // CHECK-FIXES: (*u_ptr).reset();
+
+ std::shared_ptr<T> s_ptr;
+ s_ptr.reset();
+ // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: bugprone 'reset()' call on smart
pointer
+ // CHECK-FIXES: s_ptr = nullptr;
+ s_ptr->reset();
+ // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: bugprone 'reset()' call on smart
pointer
+ // CHECK-FIXES: (*s_ptr).reset();
+}
+
+template <typename T>
+void TemplatNegativeTestTypeWithReset() {
+ std::unique_ptr<T> u_ptr;
+ u_ptr.reset();
+ u_ptr->reset(0);
+
+ std::shared_ptr<T> s_ptr;
+ s_ptr.reset();
+ s_ptr->reset(0);
+}
+
+template <typename T>
+void TemplatNegativeTestTypeWithoutReset() {
+ std::unique_ptr<T> u_ptr;
+ u_ptr.reset();
+
+ std::unique_ptr<T> s_ptr;
+ s_ptr.reset();
+}
+
+void instantiate() {
+ TemplatePositiveTest<Resettable>();
+ TemplatePositiveTest<std::unique_ptr<int>>();
+ TemplatePositiveTest<std::shared_ptr<int>>();
+ TemplatNegativeTestTypeWithReset<ResettableWithParam>();
+ TemplatNegativeTestTypeWithoutReset<NonResettable>();
+}
+
+struct S {
+ void foo() {
+ u_ptr.reset();
+ // CHECK-MESSAGES: :[[@LINE-1]]:5: warning: bugprone 'reset()' call on
smart pointer
+ // CHECK-FIXES: u_ptr = nullptr;
+ u_ptr->reset();
+ // CHECK-MESSAGES: :[[@LINE-1]]:5: warning: bugprone 'reset()' call on
smart pointer
+ // CHECK-FIXES: (*u_ptr).reset();
+ u_ptr.reset(nullptr);
+ u_ptr->doSomething();
+
+ s_ptr.reset();
+ // CHECK-MESSAGES: :[[@LINE-1]]:5: warning: bugprone 'reset()' call on
smart pointer
+ // CHECK-FIXES: s_ptr = nullptr;
+ s_ptr->reset();
+ // CHECK-MESSAGES: :[[@LINE-1]]:5: warning: bugprone 'reset()' call on
smart pointer
+ // CHECK-FIXES: (*s_ptr).reset();
+ s_ptr.reset(nullptr);
+
+ ptr.reset();
+ }
+
+ std::unique_ptr<Resettable> u_ptr;
+ std::unique_ptr<std::shared_ptr<int>> s_ptr;
+ std::unique_ptr<NonResettable> ptr;
+};
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