forked from OSchip/llvm-project
243 lines
9.0 KiB
C++
243 lines
9.0 KiB
C++
// RUN: %check_clang_tidy %s bugprone-forwarding-reference-overload %t
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namespace std {
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template <bool B, class T = void> struct enable_if { typedef T type; };
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template <class T> struct enable_if<true, T> { typedef T type; };
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template <bool B, class T = void>
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using enable_if_t = typename enable_if<B, T>::type;
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template <class T> struct enable_if_nice { typedef T type; };
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} // namespace std
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namespace foo {
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template <class T> struct enable_if { typedef T type; };
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} // namespace foo
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template <typename T> constexpr bool just_true = true;
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class Test1 {
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public:
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template <typename T> Test1(T &&n);
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// CHECK-NOTES: [[@LINE-1]]:25: warning: constructor accepting a forwarding reference can hide the copy and move constructors [bugprone-forwarding-reference-overload]
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// CHECK-NOTES: 48:3: note: copy constructor declared here
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// CHECK-NOTES: 49:3: note: copy constructor declared here
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// CHECK-NOTES: 50:3: note: move constructor declared here
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template <typename T> Test1(T &&n, int i = 5, ...);
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// CHECK-NOTES: :[[@LINE-1]]:25: warning: constructor accepting a forwarding reference can hide the copy and move constructors
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// CHECK-NOTES: 48:3: note: copy constructor declared here
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// CHECK-NOTES: 49:3: note: copy constructor declared here
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// CHECK-NOTES: 50:3: note: move constructor declared here
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template <typename T, typename U = typename std::enable_if_nice<T>::type>
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Test1(T &&n);
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// CHECK-NOTES: :[[@LINE-1]]:3: warning: constructor accepting a forwarding reference can hide the copy and move constructors
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// CHECK-NOTES: 48:3: note: copy constructor declared here
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// CHECK-NOTES: 49:3: note: copy constructor declared here
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// CHECK-NOTES: 50:3: note: move constructor declared here
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template <typename T>
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Test1(T &&n, typename foo::enable_if<long>::type i = 5, ...);
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// CHECK-NOTES: :[[@LINE-1]]:3: warning: constructor accepting a forwarding reference can hide the copy and move constructors
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// CHECK-NOTES: 48:3: note: copy constructor declared here
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// CHECK-NOTES: 49:3: note: copy constructor declared here
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// CHECK-NOTES: 50:3: note: move constructor declared here
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Test1(const Test1 &other) {}
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Test1(Test1 &other) {}
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Test1(Test1 &&other) {}
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};
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template <typename U> class Test2 {
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public:
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// Two parameters without default value, can't act as copy / move constructor.
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template <typename T, class V> Test2(T &&n, V &&m, int i = 5, ...);
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// Guarded with enable_if.
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template <typename T>
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Test2(T &&n, int i = 5,
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std::enable_if_t<sizeof(int) < sizeof(long), int> a = 5, ...);
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// Guarded with enable_if.
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template <typename T, typename X = typename std::enable_if<
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sizeof(int) < sizeof(long), double>::type &>
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Test2(T &&n);
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// Guarded with enable_if.
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template <typename T>
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Test2(T &&n, typename std::enable_if<just_true<T>>::type **a = nullptr);
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// Guarded with enable_if.
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template <typename T, typename X = std::enable_if_t<just_true<T>> *&&>
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Test2(T &&n, double d = 0.0);
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// Not a forwarding reference parameter.
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template <typename T> Test2(const T &&n);
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// Not a forwarding reference parameter.
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Test2(int &&x);
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// Two parameters without default value, can't act as copy / move constructor.
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template <typename T> Test2(T &&n, int x);
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// Not a forwarding reference parameter.
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template <typename T> Test2(U &&n);
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};
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// The copy and move constructors are both disabled.
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class Test3 {
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public:
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template <typename T> Test3(T &&n);
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template <typename T> Test3(T &&n, int I = 5, ...);
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Test3(const Test3 &rhs) = delete;
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private:
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Test3(Test3 &&rhs);
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};
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// Both the copy and the (compiler generated) move constructors can be hidden.
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class Test4 {
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public:
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template <typename T> Test4(T &&n);
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// CHECK-NOTES: :[[@LINE-1]]:25: warning: constructor accepting a forwarding reference can hide the copy and move constructors
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Test4(const Test4 &rhs);
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// CHECK-NOTES: :[[@LINE-1]]:3: note: copy constructor declared here
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};
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// Nothing can be hidden, the copy constructor is implicitly deleted.
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class Test5 {
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public:
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template <typename T> Test5(T &&n);
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Test5(Test5 &&rhs) = delete;
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};
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// Only the move constructor can be hidden.
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class Test6 {
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public:
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template <typename T> Test6(T &&n);
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// CHECK-NOTES: :[[@LINE-1]]:25: warning: constructor accepting a forwarding reference can hide the move constructor
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Test6(Test6 &&rhs);
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// CHECK-NOTES: :[[@LINE-1]]:3: note: move constructor declared here
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private:
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Test6(const Test6 &rhs);
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};
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// Do not dereference a null BaseType.
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template <class _Callable> class result_of;
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template <class _Fp, class ..._Args> class result_of<_Fp(_Args...)> { };
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template <class _Tp> using result_of_t = typename result_of<_Tp>::type;
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template <class... _Types> struct __overload;
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template <class _Tp, class... _Types>
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struct __overload<_Tp, _Types...> : __overload<_Types...> {
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using __overload<_Types...>::operator();
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};
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template <class _Tp, class... _Types>
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using __best_match_t = typename result_of_t<__overload<_Types...>(_Tp&&)>::type;
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template <class... _Types>
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class variant {
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public:
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template <class _Arg, class _Tp = __best_match_t<_Arg, _Types...> >
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constexpr variant(_Arg&& __arg) {}
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// CHECK-NOTES: :[[@LINE-1]]:13: warning: constructor accepting a forwarding reference can hide the copy and move constructors
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};
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namespace std {
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template <class T, class U> struct is_same { static constexpr bool value = false; };
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template <class T> struct is_same<T, T> { static constexpr bool value = true; };
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template <class T, class U> constexpr bool is_same_v = is_same<T, U>::value;
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template <class T> struct remove_reference { using type = T; };
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template <class T> struct remove_reference<T&> { using type = T; };
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template <class T> struct remove_reference<T&&> { using type = T; };
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template <class T> using remove_reference_t = typename remove_reference<T>::type;
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template <class T> struct remove_cv { using type = T; };
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template <class T> struct remove_cv<const T> { using type = T; };
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template <class T> struct remove_cv<volatile T> { using type = T; };
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template <class T> struct remove_cv<const volatile T> { using type = T; };
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template <class T> using remove_cv_t = typename remove_cv<T>::type;
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template <class T> struct remove_cvref { using type = remove_cv_t<remove_reference_t<T>>; };
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template <class T> using remove_cvref_t = typename remove_cvref<T>::type;
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} // namespace std
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// Handle enable_if when used as a non-type template parameter.
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class Test7 {
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public:
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// Guarded with enable_if.
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template <class T,
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typename std::enable_if_t<std::is_same_v<std::remove_cvref_t<T>, int>, int>::type = 0>
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Test7(T &&t);
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// Guarded with enable_if.
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template <class T,
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std::enable_if_t<
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!std::is_same_v<std::remove_cvref_t<T>, Test7>
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&& !std::is_same_v<std::remove_cvref_t<T>, bool>, int> = true>
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Test7(T &&t);
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Test7(const Test7 &other) = default;
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Test7(Test7 &&other) = default;
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};
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// Handle enable_if when used as a non-type template parameter following
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// a variadic template parameter pack.
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class Test8 {
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public:
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// Guarded with enable_if.
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template <class T, class... A,
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std::enable_if_t<
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!std::is_same_v<std::remove_cvref_t<T>, Test8>
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|| (sizeof...(A) > 0)>* = nullptr>
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Test8(T &&t, A &&... a);
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Test8(const Test8 &other) = default;
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Test8(Test8 &&other) = default;
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};
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// Non-type template parameter failure cases.
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class Test9 {
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public:
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// Requires a default argument (such as a literal, implicit cast expression, etc.)
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template <class T,
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std::enable_if_t<std::is_same_v<std::remove_cvref_t<T>, bool>, int>>
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Test9(T &&t);
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// CHECK-NOTES: :[[@LINE-1]]:3: warning: constructor accepting a forwarding reference can hide the copy and move constructors
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// CHECK-NOTES: 240:3: note: copy constructor declared here
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// CHECK-NOTES: 241:3: note: move constructor declared here
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// Requires a default argument (such as a literal, implicit cast expression, etc.)
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template <class T,
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std::enable_if_t<std::is_same_v<std::remove_cvref_t<T>, long>>*>
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Test9(T &&t);
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// CHECK-NOTES: :[[@LINE-1]]:3: warning: constructor accepting a forwarding reference can hide the copy and move constructors
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// CHECK-NOTES: 240:3: note: copy constructor declared here
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// CHECK-NOTES: 241:3: note: move constructor declared here
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// Only std::enable_if or std::enable_if_t are supported
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template <class T,
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typename std::enable_if_nice<T>::type* = nullptr>
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Test9(T &&t);
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// CHECK-NOTES: :[[@LINE-1]]:3: warning: constructor accepting a forwarding reference can hide the copy and move constructors
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// CHECK-NOTES: 240:3: note: copy constructor declared here
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// CHECK-NOTES: 241:3: note: move constructor declared here
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// Only std::enable_if or std::enable_if_t are supported
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template <class T,
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typename foo::enable_if<T>::type = 0>
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Test9(T &&t);
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// CHECK-NOTES: :[[@LINE-1]]:3: warning: constructor accepting a forwarding reference can hide the copy and move constructors
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// CHECK-NOTES: 240:3: note: copy constructor declared here
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// CHECK-NOTES: 241:3: note: move constructor declared here
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Test9(const Test9 &other) = default;
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Test9(Test9 &&other) = default;
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};
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