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// RUN: %clang_cc1 -fsyntax-only -verify -Wc++11-compat %s
// A declaration of a function template shall be in scope at the point of the
// explicit instantiation of the function template.
template<typename T> void f0(T);
template void f0(int); // okay
template<typename T> void f0(T) { }
// A definition of the class or class template containing a member function
// template shall be in scope at the point of the explicit instantiation of
// the member function template.
struct X0; // expected-note {{forward declaration}}
template<typename> struct X1; // expected-note 5{{declared here}}
template void X0::f0<int>(int); // expected-error {{incomplete type}}
template void X1<int>::f0<int>(int); // expected-error {{implicit instantiation of undefined template}}
// A definition of a class template or class member template shall be in scope
// at the point of the explicit instantiation of the class template or class
// member template.
template struct X1<float>; // expected-error{{explicit instantiation of undefined template}}
template<typename T>
struct X2 { // expected-note 4{{refers here}}
template<typename U>
struct Inner; // expected-note{{declared here}}
struct InnerClass; // expected-note{{forward declaration}}
};
template struct X2<int>::Inner<float>; // expected-error{{explicit instantiation of undefined template}}
// A definition of a class template shall be in scope at the point of an
// explicit instantiation of a member function or a static data member of the
// class template.
template void X1<int>::f1(int); // expected-error {{undefined template}}
template void X1<int>::f1<int>(int); // expected-error {{undefined template}}
template int X1<int>::member; // expected-error {{undefined template}}
// A definition of a member class of a class template shall be in scope at the
// point of an explicit instantiation of the member class.
template struct X2<float>::InnerClass; // expected-error{{undefined member}}
// If the declaration of the explicit instantiation names an implicitly-declared
// special member function (Clause 12), the program is ill-formed.
template X2<int>::X2(); // expected-error{{not an instantiation}}
template X2<int>::X2(const X2&); // expected-error{{not an instantiation}}
template X2<int>::~X2(); // expected-error{{not an instantiation}}
template X2<int> &X2<int>::operator=(const X2<int>&); // expected-error{{not an instantiation}}
// A definition of a class template is sufficient to explicitly
// instantiate a member of the class template which itself is not yet defined.
namespace PR7979 {
template <typename T> struct S {
void f();
static void g();
static int i;
struct S2 {
void h();
};
};
template void S<int>::f();
template void S<int>::g();
template int S<int>::i;
template void S<int>::S2::h();
template <typename T> void S<T>::f() {}
template <typename T> void S<T>::g() {}
template <typename T> int S<T>::i;
template <typename T> void S<T>::S2::h() {}
}
namespace PR11599 {
template <typename STRING_TYPE> class BasicStringPiece; // expected-note {{template is declared here}}
extern template class BasicStringPiece<int>; // expected-error{{explicit instantiation of undefined template 'PR11599::BasicStringPiece<int>}}
template class BasicStringPiece<int>;
}
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