path: root/test/SemaCXX/cxx98-compat.cpp

// RUN: %clang_cc1 -fsyntax-only -std=c++11 -Wc++98-compat -verify %s
// RUN: %clang_cc1 -fsyntax-only -std=c++11 %s

namespace std {
  struct type_info;
  using size_t = decltype(sizeof(0)); // expected-warning {{decltype}} expected-warning {{alias}}
  template<typename T> struct initializer_list {
    initializer_list(T*, size_t);
    T *p;
    size_t n;
    T *begin();
    T *end();
  };
}

template<typename ...T>  // expected-warning {{variadic templates are incompatible with C++98}}
class Variadic1 {};

template<template<typename> class ...T>  // expected-warning {{variadic templates are incompatible with C++98}}
class Variadic2 {};

template<int ...I>  // expected-warning {{variadic templates are incompatible with C++98}}
class Variadic3 {};

alignas(8) int with_alignas; // expected-warning {{'alignas' is incompatible with C++98}}
int with_attribute [[ ]]; // expected-warning {{attributes are incompatible with C++98}}

void Literals() {
  (void)u8"str"; // expected-warning {{unicode literals are incompatible with C++98}}
  (void)u"str"; // expected-warning {{unicode literals are incompatible with C++98}}
  (void)U"str"; // expected-warning {{unicode literals are incompatible with C++98}}
  (void)u'x'; // expected-warning {{unicode literals are incompatible with C++98}}
  (void)U'x'; // expected-warning {{unicode literals are incompatible with C++98}}

  (void)u8R"X(str)X"; // expected-warning {{raw string literals are incompatible with C++98}}
  (void)uR"X(str)X"; // expected-warning {{raw string literals are incompatible with C++98}}
  (void)UR"X(str)X"; // expected-warning {{raw string literals are incompatible with C++98}}
  (void)R"X(str)X"; // expected-warning {{raw string literals are incompatible with C++98}}
  (void)LR"X(str)X"; // expected-warning {{raw string literals are incompatible with C++98}}
}

template<typename T> struct S {};
namespace TemplateParsing {
  S<::S<void> > s; // expected-warning {{'<::' is treated as digraph '<:' (aka '[') followed by ':' in C++98}}
  S< ::S<void>> t; // expected-warning {{consecutive right angle brackets are incompatible with C++98 (use '> >')}}
}

void Lambda() {
  []{}(); // expected-warning {{lambda expressions are incompatible with C++98}}
}

struct Ctor {
  Ctor(int, char);
  Ctor(double, long);
};
struct InitListCtor {
  InitListCtor(std::initializer_list<bool>);
};

int InitList(int i = {}) { // expected-warning {{generalized initializer lists are incompatible with C++98}} \
                           // expected-warning {{scalar initialized from empty initializer list is incompatible with C++98}}
  (void)new int {}; // expected-warning {{generalized initializer lists are incompatible with C++98}} \
                    // expected-warning {{scalar initialized from empty initializer list is incompatible with C++98}}
  (void)int{}; // expected-warning {{generalized initializer lists are incompatible with C++98}} \
               // expected-warning {{scalar initialized from empty initializer list is incompatible with C++98}}
  int x { 0 }; // expected-warning {{generalized initializer lists are incompatible with C++98}}
  S<int> s = {}; // ok, aggregate
  s = {}; // expected-warning {{generalized initializer lists are incompatible with C++98}}
  std::initializer_list<int> xs = { 1, 2, 3 }; // expected-warning {{initialization of initializer_list object is incompatible with C++98}}
  auto ys = { 1, 2, 3 }; // expected-warning {{initialization of initializer_list object is incompatible with C++98}} \
                         // expected-warning {{'auto' type specifier is incompatible with C++98}}
  Ctor c1 = { 1, 2 }; // expected-warning {{constructor call from initializer list is incompatible with C++98}}
  Ctor c2 = { 3.0, 4l }; // expected-warning {{constructor call from initializer list is incompatible with C++98}}
  InitListCtor ilc = { true, false }; // expected-warning {{initialization of initializer_list object is incompatible with C++98}}
  const int &r = { 0 }; // expected-warning {{reference initialized from initializer list is incompatible with C++98}}
  struct { int a; const int &r; } rr = { 0, {{0}} }; // expected-warning {{reference initialized from initializer list is incompatible with C++98}}
  return { 0 }; // expected-warning {{generalized initializer lists are incompatible with C++98}}
}
struct DelayedDefaultArgumentParseInitList {
  void f(int i = {1}) { // expected-warning {{generalized initializer lists are incompatible with C++98}}
  }
};

int operator"" _hello(const char *); // expected-warning {{literal operators are incompatible with C++98}}

enum EnumFixed : int { // expected-warning {{enumeration types with a fixed underlying type are incompatible with C++98}}
};

enum class EnumScoped { // expected-warning {{scoped enumerations are incompatible with C++98}}
};

void Deleted() = delete; // expected-warning {{deleted function definitions are incompatible with C++98}}
struct Defaulted {
  Defaulted() = default; // expected-warning {{defaulted function definitions are incompatible with C++98}}
};

int &&RvalueReference = 0; // expected-warning {{rvalue references are incompatible with C++98}}
struct RefQualifier {
  void f() &; // expected-warning {{reference qualifiers on functions are incompatible with C++98}}
};

auto f() -> int; // expected-warning {{trailing return types are incompatible with C++98}}

void RangeFor() {
  int xs[] = {1, 2, 3};
  for (int &a : xs) { // expected-warning {{range-based for loop is incompatible with C++98}}
  }
  for (auto &b : {1, 2, 3}) {
  // expected-warning@-1 {{range-based for loop is incompatible with C++98}}
  // expected-warning@-2 {{'auto' type specifier is incompatible with C++98}}
  // expected-warning@-3 {{initialization of initializer_list object is incompatible with C++98}}
  // expected-warning@-4 {{reference initialized from initializer list is incompatible with C++98}}
  }
  struct Agg { int a, b; } const &agg = { 1, 2 }; // expected-warning {{reference initialized from initializer list is incompatible with C++98}}
}

struct InClassInit {
  int n = 0; // expected-warning {{in-class initialization of non-static data members is incompatible with C++98}}
};

struct OverrideControlBase {
  virtual void f();
  virtual void g();
};
struct OverrideControl final : OverrideControlBase { // expected-warning {{'final' keyword is incompatible with C++98}}
  virtual void f() override; // expected-warning {{'override' keyword is incompatible with C++98}}
  virtual void g() final; // expected-warning {{'final' keyword is incompatible with C++98}}
};

using AliasDecl = int; // expected-warning {{alias declarations are incompatible with C++98}}
template<typename T> using AliasTemplate = T; // expected-warning {{alias declarations are incompatible with C++98}}

inline namespace InlineNS { // expected-warning {{inline namespaces are incompatible with C++98}}
}

auto auto_deduction = 0; // expected-warning {{'auto' type specifier is incompatible with C++98}}
int *p = new auto(0); // expected-warning {{'auto' type specifier is incompatible with C++98}}

const int align_of = alignof(int); // expected-warning {{alignof expressions are incompatible with C++98}}
char16_t c16 = 0; // expected-warning {{'char16_t' type specifier is incompatible with C++98}}
char32_t c32 = 0; // expected-warning {{'char32_t' type specifier is incompatible with C++98}}
constexpr int const_expr = 0; // expected-warning {{'constexpr' specifier is incompatible with C++98}}
decltype(const_expr) decl_type = 0; // expected-warning {{'decltype' type specifier is incompatible with C++98}}
__decltype(const_expr) decl_type2 = 0; // ok
void no_except() noexcept; // expected-warning {{noexcept specifications are incompatible with C++98}}
bool no_except_expr = noexcept(1 + 1); // expected-warning {{noexcept expressions are incompatible with C++98}}
void *null = nullptr; // expected-warning {{'nullptr' is incompatible with C++98}}
static_assert(true, "!"); // expected-warning {{static_assert declarations are incompatible with C++98}}

// FIXME: Reintroduce this test if support for inheriting constructors is
//        implemented.
#if 0
struct InhCtorBase {
  InhCtorBase(int);
};
struct InhCtorDerived : InhCtorBase {
  using InhCtorBase::InhCtorBase; // xpected-warning {{inheriting constructors are incompatible with C++98}}
};
#endif

struct FriendMember {
  static void MemberFn();
  friend void FriendMember::MemberFn(); // expected-warning {{friend declaration naming a member of the declaring class is incompatible with C++98}}
};

struct DelegCtor {
  DelegCtor(int) : DelegCtor() {} // expected-warning {{delegating constructors are incompatible with C++98}}
  DelegCtor();
};

template<int n = 0> void DefaultFuncTemplateArg(); // expected-warning {{default template arguments for a function template are incompatible with C++98}}

template<typename T> int TemplateFn(T) { return 0; }
void LocalTemplateArg() {
  struct S {};
  TemplateFn(S()); // expected-warning {{local type 'S' as template argument is incompatible with C++98}}
}
struct {} obj_of_unnamed_type; // expected-note {{here}}
int UnnamedTemplateArg = TemplateFn(obj_of_unnamed_type); // expected-warning {{unnamed type as template argument is incompatible with C++98}}

namespace RedundantParensInAddressTemplateParam {
  int n;
  template<int*p> struct S {};
  S<(&n)> s; // expected-warning {{redundant parentheses surrounding address non-type template argument are incompatible with C++98}}
  S<(((&n)))> t; // expected-warning {{redundant parentheses surrounding address non-type template argument are incompatible with C++98}}
}

namespace TemplateSpecOutOfScopeNs {
  template<typename T> struct S {}; // expected-note {{here}}
}
template<> struct TemplateSpecOutOfScopeNs::S<char> {}; // expected-warning {{class template specialization of 'S' outside namespace 'TemplateSpecOutOfScopeNs' is incompatible with C++98}}

struct Typename {
  template<typename T> struct Inner {};
};
typename ::Typename TypenameOutsideTemplate(); // expected-warning {{use of 'typename' outside of a template is incompatible with C++98}}
Typename::template Inner<int> TemplateOutsideTemplate(); // expected-warning {{use of 'template' keyword outside of a template is incompatible with C++98}}

struct TrivialButNonPOD {
  int f(int);
private:
  int k;
};
void Ellipsis(int n, ...);
void TrivialButNonPODThroughEllipsis() {
  Ellipsis(1, TrivialButNonPOD()); // expected-warning {{passing object of trivial but non-POD type 'TrivialButNonPOD' through variadic function is incompatible with C++98}}
}

struct HasExplicitConversion {
  explicit operator bool(); // expected-warning {{explicit conversion functions are incompatible with C++98}}
};

struct Struct {};
enum Enum { enum_val =