clang/test/Modules/cxx-templates.cpp

// RUN: rm -rf %t
// RUN: not %clang_cc1 -x objective-c++ -fmodules -fno-modules-error-recovery -fmodules-cache-path=%t -I %S/Inputs %s -std=c++11 -ast-dump-lookups | FileCheck %s --check-prefix=CHECK-GLOBAL
// RUN: not %clang_cc1 -x objective-c++ -fmodules -fno-modules-error-recovery -fmodules-cache-path=%t -I %S/Inputs %s -std=c++11 -ast-dump-lookups -ast-dump-filter N | FileCheck %s --check-prefix=CHECK-NAMESPACE-N
// RUN: not %clang_cc1 -x objective-c++ -fmodules -fno-modules-error-recovery -fmodules-cache-path=%t -I %S/Inputs %s -std=c++11 -ast-dump | FileCheck %s --check-prefix=CHECK-DUMP
// RUN: %clang_cc1 -x objective-c++ -fmodules -fno-modules-error-recovery -fmodules-cache-path=%t -I %S/Inputs %s -verify -std=c++11

@import cxx_templates_a;
@import cxx_templates_b;
@import cxx_templates_c;
@import cxx_templates_common;

template<typename, char> struct Tmpl_T_C {};
template<typename, int, int> struct Tmpl_T_I_I {};

template<typename A, typename B, A> struct Tmpl_T_T_A {};
template<typename A, typename B, B> struct Tmpl_T_T_B {};

template<int> struct UseInt {};

void g() {
  f(0);
  f<double>(1.0);
  f<int>();
  f(); // expected-error {{no matching function}}
  // expected-note@Inputs/cxx-templates-b.h:3 {{couldn't infer template argument}}
  // expected-note@Inputs/cxx-templates-b.h:4 {{requires single argument}}

  N::f(0);
  N::f<double>(1.0);
  N::f<int>();
  N::f(); // expected-error {{no matching function}}
  // expected-note@Inputs/cxx-templates-b.h:6 {{couldn't infer template argument}}
  // expected-note@Inputs/cxx-templates-b.h:7 {{requires single argument}}

  template_param_kinds_1<0>(); // ok, from cxx-templates-a.h
  template_param_kinds_1<int>(); // ok, from cxx-templates-b.h

  template_param_kinds_2<Tmpl_T_C>(); // expected-error {{no matching function}}
  // expected-note@Inputs/cxx-templates-a.h:11 {{invalid explicitly-specified argument}}
  // expected-note@Inputs/cxx-templates-b.h:11 {{invalid explicitly-specified argument}}

  template_param_kinds_2<Tmpl_T_I_I>(); // expected-error {{ambiguous}}
  // expected-note@Inputs/cxx-templates-a.h:11 {{candidate}}
  // expected-note@Inputs/cxx-templates-b.h:11 {{candidate}}

  // FIXME: This should be valid, but we incorrectly match the template template
  // argument against both template template parameters.
  template_param_kinds_3<Tmpl_T_T_A>(); // expected-error {{ambiguous}}
  // expected-note@Inputs/cxx-templates-a.h:12 {{candidate}}
  // expected-note@Inputs/cxx-templates-b.h:12 {{candidate}}
  template_param_kinds_3<Tmpl_T_T_B>(); // expected-error {{ambiguous}}
  // expected-note@Inputs/cxx-templates-a.h:12 {{candidate}}
  // expected-note@Inputs/cxx-templates-b.h:12 {{candidate}}

  // Trigger the instantiation of a template in 'a' that uses a type defined in
  // 'common'. That type is not visible here.
  PerformDelayedLookup(defined_in_common);

  // Likewise, but via a default argument.
  PerformDelayedLookupInDefaultArgument(defined_in_common);

  // Trigger the instantiation of a template in 'b' that uses a type defined in
  // 'b_impl'. That type is not visible here.
  UseDefinedInBImpl<int>();

  // Trigger the instantiation of a template in 'a' that uses a type defined in
  // 'b_impl', via a template defined in 'b'. Since the type is visible from
  // within 'b', the instantiation succeeds.
  UseDefinedInBImplIndirectly(defined_in_b_impl);

  // Trigger the instantiation of a template in 'a' that uses a type defined in
  // 'b_impl'. That type is not visible here, nor in 'a'. This fails; there is
  // no reason why DefinedInBImpl should be visible here.
  //
  // We turn off error recovery for modules in this test (so we don't get an
  // implicit import of cxx_templates_b_impl), and that results in us producing
  // a big spew of errors here.
  //
  // expected-error@Inputs/cxx-templates-a.h:19 {{definition of 'DefinedInBImpl' must be imported}}
  // expected-note@Inputs/cxx-templates-b-impl.h:1 +{{definition is here}}
  // expected-error@Inputs/cxx-templates-a.h:19 +{{}}
  // expected-error@Inputs/cxx-templates-a.h:20 +{{}}
  PerformDelayedLookup(defined_in_b_impl); // expected-note {{in instantiation of}}

  merge_templates_a = merge_templates_b; // ok, same type

  using T = decltype(enum_a_from_a);
  using T = decltype(enum_b_from_b);
  T e = true ? enum_a_from_a : enum_b_from_b;

  UseRedeclaredEnum<int>(UseInt<1>());
  // FIXME: Reintroduce this once we merge function template specializations.
  //static_assert(UseRedeclaredEnumA == UseRedeclaredEnumB, "");
  //static_assert(UseRedeclaredEnumA == UseRedeclaredEnum<int>, "");
  //static_assert(UseRedeclaredEnumB == UseRedeclaredEnum<int>, "");
  static_assert(enum_c_from_a == enum_c_from_b, "");
  CommonTemplate<int> cti;
  CommonTemplate<int>::E eee = CommonTemplate<int>::c;

  TemplateInstantiationVisibility<char[1]> tiv1;
  TemplateInstantiationVisibility<char[2]> tiv2;
  TemplateInstantiationVisibility<char[3]> tiv3; // expected-error {{must be imported from module 'cxx_templates_b_impl'}}
  // expected-note@cxx-templates-b-impl.h:10 {{previous definition is here}}
  TemplateInstantiationVisibility<char[4]> tiv4;

  int &p = WithPartialSpecializationUse().f();
  int &q = WithExplicitSpecializationUse().inner_template<int>();
  int *r = PartiallyInstantiatePartialSpec<int*>::bar();

  (void)&WithImplicitSpecialMembers<int>::n;
}

static_assert(Outer<int>::Inner<int>::f() == 1, "");
static_assert(Outer<int>::Inner<int>::g() == 2, "");

static_assert(MergeTemplateDefinitions<int>::f() == 1, "");
static_assert(MergeTemplateDefinitions<int>::g() == 2, "");

RedeclaredAsFriend<int> raf1;
RedeclareTemplateAsFriend<double> rtaf;
RedeclaredAsFriend<double> raf2;

MergeSpecializations<int*>::partially_specialized_in_a spec_in_a_1;
MergeSpecializations<int&>::partially_specialized_in_b spec_in_b_1;
MergeSpecializations<int[]>::partially_specialized_in_c spec_in_c_1;
MergeSpecializations<char>::explicitly_specialized_in_a spec_in_a_2;
MergeSpecializations<double>::explicitly_specialized_in_b spec_in_b_2;
MergeSpecializations<bool>::explicitly_specialized_in_c spec_in_c_2;

@import cxx_templates_common;

typedef SomeTemplate<int*> SomeTemplateIntPtr;
typedef SomeTemplate<int&> SomeTemplateIntRef;
SomeTemplate<char*> some_template_char_ptr;
SomeTemplate<char&> some_template_char_ref;

void testImplicitSpecialMembers(SomeTemplate<char[1]> &a,
                                const SomeTemplate<char[1]> &b,
                                SomeTemplate<char[2]> &c,
                                const SomeTemplate<char[2]> &d) {
  a = b;
  c = d;
}

bool testFriendInClassTemplate(Std::WithFriend<int> wfi) {
  return wfi != wfi;
}

namespace Std {
  void g(); // expected-error {{functions that differ only in their return type cannot be overloaded}}
  // expected-note@cxx-templates-common.h:21 {{previous}}
}

// CHECK-GLOBAL:      DeclarationName 'f'
// CHECK-GLOBAL-NEXT: |-FunctionTemplate {{.*}} 'f'
// CHECK-GLOBAL-NEXT: `-FunctionTemplate {{.*}} 'f'

// CHECK-NAMESPACE-N:      DeclarationName 'f'
// CHECK-NAMESPACE-N-NEXT: |-FunctionTemplate {{.*}} 'f'
// CHECK-NAMESPACE-N-NEXT: `-FunctionTemplate {{.*}} 'f'

// CHECK-DUMP:      ClassTemplateDecl {{.*}} <{{.*[/\\]}}cxx-templates-common.h:1:1, {{.*}}>  col:{{.*}} in cxx_templates_common SomeTemplate
// CHECK-DUMP:        ClassTemplateSpecializationDecl {{.*}} prev [[CHAR2:[^ ]*]] {{.*}} SomeTemplate
// CHECK-DUMP-NEXT:     TemplateArgument type 'char [2]'
// CHECK-DUMP:        ClassTemplateSpecializationDecl [[CHAR2]] {{.*}} SomeTemplate definition
// CHECK-DUMP-NEXT:     TemplateArgument type 'char [2]'
// CHECK-DUMP:        ClassTemplateSpecializationDecl {{.*}} prev [[CHAR1:[^ ]*]] {{.*}} SomeTemplate
// CHECK-DUMP-NEXT:     TemplateArgument type 'char [1]'
// CHECK-DUMP:        ClassTemplateSpecializationDecl [[CHAR1]] {{.*}} SomeTemplate definition
// CHECK-DUMP-NEXT:     TemplateArgument type 'char [1]'