// RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 %s -Wno-c++1y-extensions
// This test creates cases where implicit instantiations of various entities
// would cause a diagnostic, but provides expliict specializations for those
// entities that avoid the diagnostic. The specializations are alternately
// declarations and definitions, and the intent of this test is to verify
// that we allow specializations only in the appropriate namespaces (and
// nowhere else).
struct NonDefaultConstructible {
NonDefaultConstructible(int);
};
// C++ [temp.expl.spec]p1:
// An explicit specialization of any of the following:
// -- function template
namespace N0 {
template<typename T> void f0(T) {
T t;
}
template<> void f0(NonDefaultConstructible) { }
void test_f0(NonDefaultConstructible NDC) {
f0(NDC);
}
template<> void f0(int);
template<> void f0(long);
}
template<> void N0::f0(int) { } // okay
namespace N1 {
template<> void N0::f0(long) { } // expected-error{{does not enclose namespace}}
}
template<> void N0::f0(double) { }
struct X1 {
template<typename T> void f(T);
template<> void f(int); // OK (DR727)
};
// -- class template
namespace N0 {
template<typename T>
struct X0 { // expected-note {{here}}
static T member;
void f1(T t) {
t = 17;
}
struct Inner : public T { }; // expected-note 2{{here}}
template<typename U>
struct InnerTemplate : public T { }; // expected-note 1{{explicitly specialized}} \
// expected-error{{base specifier}}
template<typename U>
void ft1(T t, U u);
};
}
template<typename T>
template<typename U>
void N0::X0<T>::ft1(T t, U u) {
t = u;
}
template<typename T> T N0::X0<T>::member;
template<> struct N0::X0<void> { };
N0::X0<void> test_X0;
namespace N1 {
template<> struct N0::X0<const void> { }; // expected-error{{class template specialization of 'X0' not in a namespace enclosing 'N0'}}
}
namespace N0 {
template<> struct X0<volatile void>;
}
template<> struct N0::X0<volatile void> {
void f1(void *);
};
// -- variable template [C++1y]
namespace N0 {
template<typename T> int v0; // expected-note 4{{explicitly specialized declaration is here}}
template<> int v0<char[1]>; // expected-note {{previous definition is here}}
template<> int v0<char[2]>;
template<> int v0<char[5]>; // expected-note {{previous definition is here}}
template<> int v0<char[6]>;
}
using N0::v0;
template<typename T> int v1; // expected-note 4{{explicitly specialized declaration is here}}
template<> int v1<char[3]>; // expected-note {{previous definition is here}}
template<> int v1<char[4]>; // expected-note {{previous definition is here}}
template<> int v1<char[7]>; // expected-note {{previous definition is here}}
template<> int v1<char[8]>;
template<> int N0::v0<int[1]>;
template<> int v0<int[2]>;
template<> int ::v1<int[3]>; // expected-warning {{extra qualification}}
template<> int v1<int[4]>;
template<> int N0::v0<char[1]>; // expected-error {{redefinition of 'v0<char[1]>'}}
template<> int v0<char[2]>;
template<> int ::v1<char[3]>; // expected-warning {{extra qualification}}
// expected-error@-1 {{redefinition of 'v1<char[3]>'}}
template<> int v1<char[4]>; // expected-error {{redefinition of 'v1<char[4]>'}}
namespace N1 {
template<> int N0::v0<int[5]>; // expected-error {{not in a namespace enclosing 'N0'}}
template<> int v0<int[6]>; // expected-error {{not in a namespace enclosing 'N0'}}
template<> int ::v1<int[7]>; // expected-error {{must occur at global scope}}
template<> int v1<int[8]>; // expected-error {{must occur at global scope}}
template<> int N0::v0<char[5]>; // expected-error {{not in a namespace enclosing 'N0'}}
// expected-error@-1 {{redefinition of 'v0<char[5]>'}}
template<> int v0<char[6]>; // expected-error {{not in a namespace enclosing 'N0'}}
template<> int ::v1<char[7]>; // expected-error {{must occur at global scope}}
// expected-error@-1 {{redefinition of 'v1<char[7]>'}}
template<> int v1<char[8]>; // expected-error {{must occur at global scope}}
}
// -- member function of a class template
template<> void N0::X0<void*>::f1(void *) { }
void test_spec(N0::X0<void*> xvp, void *vp) {
xvp.f1(vp);
}
namespace N0 {
template<> void X0<volatile void>::f1(void *) { } // expected-error{{no function template matches}}
template<> void X0<const volatile void*>::f1(const volatile void*);
}
void test_x0_cvvoid(N0::X0<const volatile void*> x0, const volatile void *cvp) {
x0.f1(cvp); // okay: we've explicitly specialized
}
// -- static data member of a class template
namespace N0 {
// This actually tests p15; the following is a declaration, not a definition.
template<>
NonDefaultConstructible X0<NonDefaultConstructible>::member;
template<> long X0<long>::member = 17;
template<> float X0<float>::member;
template<> double X0<double>::member;
}
NonDefaultConstructible &get_static_member() {
return N0::X0<NonDefaultConstructible>::member;
}
template<> int N0::X0<int>::member;
template<> float N0::X0<float>::member = 3.14f;
namespace N1 {
template<> double N0::X0<double>::member = 3.14; // expected-error{{does not enclose namespace}}
}
// -- member class of a class template
namespace N0 {
template<>
struct X0<void*>::Inner { };
template<>
struct X0<int>::Inner { };
template<>
struct X0<unsigned>::Inner;
template<>
struct X0<float>::Inner;
template<>
struct X0<double>::Inner; // expected-note{{forward declaration}}
}
template<>
struct N0::X0<long>::Inner { };
template<>
struct N0::X0<float>::Inner { };
namespace N1 {
template<>
struct N0::X0<unsigned>::Inner { }; // expected-error{{member class specialization}}
template<>
struct N0::X0<unsigned long>::Inner { }; // expected-error{{member class specialization}}
};
N0::X0<void*>::Inner inner0;
N0::X0<int>::Inner inner1;
N0::X0<long>::Inner inner2;
N0::X0<float>::Inner inner3;
N0::X0<double>::Inner inner4; // expected-error{{incomplete}}
// -- member class template of a class template
namespace N0 {
template<>
template<>
struct X0<void*>::InnerTemplate<int> { };
template<> template<>
struct X0<int>::InnerTemplate<int>; // expected-note{{forward declaration}}
template<> template<>
struct X0<int>::InnerTemplate<long>;
template<> template<>
struct X0<int>::InnerTemplate<double>;
}
template<> template<>
struct N0::X0<int>::InnerTemplate<long> { }; // okay
template<> template<>
struct N0::X0<int>::InnerTemplate<float> { };
namespace N1 {
template<> template<>
struct N0::X0<int>::InnerTemplate<double> { }; // expected-error{{enclosing}}
}
N0::X0<void*>::InnerTemplate<int> inner_template0;
N0::X0<int>::InnerTemplate<int> inner_template1; // expected-error{{incomplete}}
N0::X0<int>::InnerTemplate<long> inner_template2;
N0::X0<int>::InnerTemplate<unsigned long> inner_template3; // expected-note{{instantiation}}
// -- member function template of a class template
namespace N0 {
template<>
template<>
void X0<void*>::ft1(void*, const void*) { }
template<> template<>
void X0<void*>::ft1(void *, int);
template<> template<>
void X0<void*>::ft1(void *, unsigned);
template<> template<>
void X0<void*>::ft1(void *, long);
}
template<> template<>
void N0::X0<void*>::ft1(void *, unsigned) { } // okay
template<> template<>
void N0::X0<void*>::ft1(void *, float) { }
namespace N1 {
template<> template<>
void N0::X0<void*>::ft1(void *, long) { } // expected-error{{does not enclose namespace}}
}
void test_func_template(N0::X0<void *> xvp, void *vp, const void *cvp,
int i, unsigned u) {
xvp.ft1(vp, cvp);
xvp.ft1(vp, i);
xvp.ft1(vp, u);
}
namespace has_inline_namespaces {
inline namespace inner {
template<class T> void f(T&);
template<class T>
struct X0 {
struct MemberClass;
void mem_func();
template<typename U>
struct MemberClassTemplate;
template<typename U>
void mem_func_template(U&);
static int value;
};
}
struct X1;
struct X2;
// An explicit specialization whose declarator-id is not qualified
// shall be declared in the nearest enclosing namespace of the
// template, or, if the namespace is inline (7.3.1), any namespace
// from its enclosing namespace set.
template<> void f(X1&);
template<> void f<X2>(X2&);
template<> struct X0<X1> { };
template<> struct X0<X2>::MemberClass { };
template<> void X0<X2>::mem_func();
template<> template<typename T> struct X0<X2>::MemberClassTemplate { };
template<> template<typename T> void X0<X2>::mem_func_template(T&) { }
template<> int X0<X2>::value = 12;
}
struct X3;
struct X4;
template<> void has_inline_namespaces::f(X3&);
template<> void has_inline_namespaces::f<X4>(X4&);
template<> struct has_inline_namespaces::X0<X3> { };
template<> struct has_inline_namespaces::X0<X4>::MemberClass { };
template<> void has_inline_namespaces::X0<X4>::mem_func();
template<> template<typename T>
struct has_inline_namespaces::X0<X4>::MemberClassTemplate { };
template<> template<typename T>
void has_inline_namespaces::X0<X4>::mem_func_template(T&) { }
template<> int has_inline_namespaces::X0<X4>::value = 13;
namespace PR12938 {
template<typename> [[noreturn]] void func();
template<> void func<int>();
}
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