xref: /external/clang/test/CXX/temp/temp.decls/temp.variadic/p5.cpp

// RUN: %clang_cc1 -std=c++0x -fblocks -fsyntax-only -verify %s

template<typename T, typename U> struct pair;
template<typename ...> struct tuple;

// A parameter pack whose name appears within the pattern of a pack
// expansion is expanded by that pack expansion. An appearance of the
// name of a parameter pack is only expanded by the innermost
// enclosing pack expansion. The pattern of a pack expansion shall
// name one or more parameter packs that are not expanded by a nested
// pack expansion.
template<typename... Types>
struct Expansion {
  typedef pair<Types..., int> expand_with_pacs; // okay
  typedef pair<Types, int...> expand_no_packs;  // expected-error{{pack expansion does not contain any unexpanded parameter packs}}
  typedef pair<pair<Types..., int>..., int> expand_with_expanded_nested; // expected-error{{pack expansion does not contain any unexpanded parameter packs}}
};

// All of the parameter packs expanded by a pack expansion shall have
// the same number of arguments specified.
template<typename ...Types>
struct ExpansionLengthMismatch {
  template<typename ...OtherTypes>
  struct Inner {
    typedef tuple<pair<Types, OtherTypes>...> type; // expected-error{{pack expansion contains parameter packs 'Types' and 'OtherTypes' that have different lengths (3 vs. 2)}}
  };
};

ExpansionLengthMismatch<int, long>::Inner<unsigned int, unsigned long>::type
  *il_pairs;
tuple<pair<int, unsigned int>, pair<long, unsigned long> >*il_pairs_2 = il_pairs;

ExpansionLengthMismatch<short, int, long>::Inner<unsigned int, unsigned long>::type // expected-note{{in instantiation of template class 'ExpansionLengthMismatch<short, int, long>::Inner<unsigned int, unsigned long>' requested here}}
  *il_pairs_bad;


// An appearance of a name of a parameter pack that is not expanded is
// ill-formed.

// Test for unexpanded parameter packs in each of the type nodes.
template<typename T, int N, typename ... Types>
struct TestPPName
  : public Types, public T  // expected-error{{base type contains unexpanded parameter pack 'Types'}}
{
  // BuiltinType is uninteresting
  // FIXME: ComplexType is uninteresting?
  // PointerType
  typedef Types *types_pointer; // expected-error{{declaration type contains unexpanded parameter pack 'Types'}}

  // BlockPointerType
  typedef Types (^block_pointer_1)(int); // expected-error{{declaration type contains unexpanded parameter pack 'Types'}}
  typedef int (^block_pointer_2)(Types); // expected-error{{declaration type contains unexpanded parameter pack 'Types'}}

  // LValueReferenceType
  typedef Types &lvalue_ref; // expected-error{{declaration type contains unexpanded parameter pack 'Types'}}

  // RValueReferenceType
  typedef Types &&rvalue_ref; // expected-error{{declaration type contains unexpanded parameter pack 'Types'}}

  // MemberPointerType
  typedef Types TestPPName::* member_pointer_1; // expected-error{{declaration type contains unexpanded parameter pack 'Types'}}
  typedef int Types::*member_pointer_2; // expected-error{{declaration type contains unexpanded parameter pack 'Types'}}

  // ConstantArrayType
  typedef Types constant_array[17]; // expected-error{{declaration type contains unexpanded parameter pack 'Types'}}

  // IncompleteArrayType
  typedef Types incomplete_array[]; // expected-error{{declaration type contains unexpanded parameter pack 'Types'}}

  // VariableArrayType
  void f(int i) {
    Types variable_array[i]; // expected-error{{declaration type contains unexpanded parameter pack 'Types'}}
  }

  // DependentSizedArrayType
  typedef Types dependent_sized_array[N]; // expected-error{{declaration type contains unexpanded parameter pack 'Types'}}

  // DependentSizedExtVectorType
  typedef Types dependent_sized_ext_vector __attribute__((ext_vector_type(N))); // expected-error{{declaration type contains unexpanded parameter pack 'Types'}}

  // VectorType is uninteresting

  // ExtVectorType
  typedef Types ext_vector __attribute__((ext_vector_type(4))); // expected-error{{declaration type contains unexpanded parameter pack 'Types'}}

  // FunctionProtoType
  typedef Types (function_type_1)(int); // expected-error{{declaration type contains unexpanded parameter pack 'Types'}}
  typedef int (function_type_2)(Types); // expected-error{{declaration type contains unexpanded parameter pack 'Types'}}

  // FunctionNoProtoType is uninteresting
  // UnresolvedUsingType is uninteresting
  // ParenType is uninteresting
  // TypedefType is uninteresting

  // TypeOfExprType
  typedef __typeof__((static_cast<Types>(0))) typeof_expr; // expected-error{{declaration type contains unexpanded parameter pack 'Types'}}

  // TypeOfType
  typedef __typeof__(Types) typeof_type;  // expected-error{{declaration type contains unexpanded parameter pack 'Types'}}

  // DecltypeType
  typedef decltype((static_cast<Types>(0))) typeof_expr; // expected-error{{declaration type contains unexpanded parameter pack 'Types'}}

  // RecordType is uninteresting
  // EnumType is uninteresting
  // ElaboratedType is uninteresting

  // TemplateTypeParmType
  typedef Types template_type_parm; // expected-error{{declaration type contains unexpanded parameter pack 'Types'}}

  // SubstTemplateTypeParmType is uninteresting

  // TemplateSpecializationType
  typedef pair<Types, int> template_specialization; // expected-error{{declaration type contains unexpanded parameter pack 'Types'}}

  // InjectedClassName is uninteresting.

  // DependentNameType
  typedef typename Types::type dependent_name; // expected-error{{declaration type contains unexpanded parameter pack 'Types'}}

  // DependentTemplateSpecializationType
  typedef typename Types::template apply<int> dependent_name_1; // expected-error{{declaration type contains unexpanded parameter pack 'Types'}}
  typedef typename T::template apply<Types> dependent_name_2; // expected-error{{declaration type contains unexpanded parameter pack 'Types'}}

  // ObjCObjectType is uninteresting
  // ObjCInterfaceType is uninteresting
  // ObjCObjectPointerType is uninteresting
};

// FIXME: Test for unexpanded parameter packs in each of the expression nodes.
template<int ...Values>
void test_unexpanded_in_exprs() {
  // PredefinedExpr is uninteresting
  // DeclRefExpr
  Values; // expected-error{{expression contains unexpanded parameter pack 'Values'}}
  // IntegerLiteral is uninteresting
  // FloatingLiteral is uninteresting
  // ImaginaryLiteral is uninteresting
  // StringLiteral is uninteresting
  // CharacterLiteral is uninteresting
  (Values); // expected-error{{expression contains unexpanded parameter pack 'Values'}}
  // UnaryOperator
  -Values; // expected-error{{expression contains unexpanded parameter pack 'Values'}}
  // OffsetOfExpr
  struct OffsetMe {
    int array[17];
  };
  __builtin_offsetof(OffsetMe, array[Values]); // expected-error{{expression contains unexpanded parameter pack 'Values'}}
  // FIXME: continue this...
}

template<typename ... Types>
void TestPPNameFunc(int i) {
  f(static_cast<Types>(i)); // expected-error{{expression contains unexpanded parameter pack 'Types'}}
}

// Test for unexpanded parameter packs in declarations.
// FIXME: Attributes?
template<typename T, typename... Types>
struct TestUnexpandedDecls : T{
  void member_function(Types);  // expected-error{{declaration type contains unexpanded parameter pack 'Types'}}
  void member_function () throw(Types); // expected-error{{declaration type contains unexpanded parameter pack 'Types'}}
  operator Types() const; // expected-error{{declaration type contains unexpanded parameter pack 'Types'}}
  Types data_member;  // expected-error{{data member type contains unexpanded parameter pack 'Types'}}
  static Types static_data_member; // expected-error{{declaration type contains unexpanded parameter pack 'Types'}}
  unsigned bit_field : static_cast<Types>(0);  // expected-error{{bit-field size contains unexpanded parameter pack 'Types'}}
  static_assert(static_cast<Types>(0), "Boom"); // expected-error{{static assertion contains unexpanded parameter pack 'Types'}}

  enum E0 : Types {  // expected-error{{fixed underlying type contains unexpanded parameter pack 'Types'}}
    EnumValue = static_cast<Types>(0) // expected-error{{enumerator value contains unexpanded parameter pack 'Types'}}
  };

  using typename Types::type; // expected-error{{using declaration contains unexpanded parameter pack 'Types'}}
  using Types::value; // expected-error{{using declaration contains unexpanded parameter pack 'Types'}}
  using T::operator Types; // expected-error{{using declaration contains unexpanded parameter pack 'Types'}}

  friend class Types::foo; // expected-error{{friend declaration contains unexpanded parameter pack 'Types'}}
  friend void friend_func(Types); // expected-error{{friend declaration contains unexpanded parameter pack 'Types'}}
  friend void Types::other_friend_func(int); // expected-error{{friend declaration contains unexpanded parameter pack 'Types'}}

  void test_initializers() {
    T copy_init = static_cast<Types>(0); // expected-error{{initializer contains unexpanded parameter pack 'Types'}}
    T direct_init(0, static_cast<Types>(0)); // expected-error{{expression contains unexpanded parameter pack 'Types'}}
    T list_init = { static_cast<Types>(0) }; // expected-error{{initializer contains unexpanded parameter pack 'Types'}}
  }

  void default_function_args(T = static_cast<Types>(0)); // expected-error{{default argument contains unexpanded parameter pack 'Types'}}

  template<typename = Types*> // expected-error{{default argument contains unexpanded parameter pack 'Types'}}
    struct default_template_args_1;
  template<int = static_cast<Types>(0)> // expected-error{{default argument contains unexpanded parameter pack 'Types'}}
    struct default_template_args_2;
  template<template<typename> class = Types::template apply> // expected-error{{default argument contains unexpanded parameter pack 'Types'}}
    struct default_template_args_3;

  template<Types value> // expected-error{{non-type template parameter type contains unexpanded parameter pack 'Types'}}
  struct non_type_template_param_type;

  void decls_in_stmts() {
    Types t; // expected-error{{declaration type contains unexpanded parameter pack 'Types'}}
    for (Types *t = 0; ; ) { } // expected-error{{declaration type contains unexpanded parameter pack 'Types'}}
    for (; Types *t = 0; ) { } // expected-error{{declaration type contains unexpanded parameter pack 'Types'}}
    switch(Types *t = 0) { } // expected-error{{declaration type contains unexpanded parameter pack 'Types'}}
    while(Types *t = 0) { } // expected-error{{declaration type contains unexpanded parameter pack 'Types'}}
    if (Types *t = 0) { } // expected-error{{declaration type contains unexpanded parameter pack 'Types'}}
    try {
    } catch (Types*) { // expected-error{{exception type contains unexpanded parameter pack 'Types'}}
    }
  }
};

// FIXME: Test for unexpanded parameter packs in each of the statements.

// FIXME: Once we have template argument deduction, we can test
// unexpanded parameter packs in partial specializations.
// template<typename ...Types>
// struct TestUnexpandedDecls<int, Types>;

// Test for diagnostics in the presence of multiple unexpanded
// parameter packs.
template<typename T, typename U> struct pair;

template<typename ...OuterTypes>
struct MemberTemplatePPNames {
  template<typename ...InnerTypes>
  struct Inner {
    typedef pair<OuterTypes, InnerTypes>* types; // expected-error{{declaration type contains unexpanded parameter packs 'OuterTypes' and 'InnerTypes'}}

    template<typename ...VeryInnerTypes>
    struct VeryInner {
      typedef pair<pair<VeryInnerTypes, OuterTypes>, pair<InnerTypes, OuterTypes> > types; // expected-error{{declaration type contains unexpanded parameter packs 'VeryInnerTypes', 'OuterTypes', ...}}
    };
  };
};