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// RUN: clang-cc -fsyntax-only -verify -pedantic %s
//
// Tests explicit instantiation of templates.
template<typename T, typename U = T> class X0 { };
namespace N {
template<typename T, typename U = T> class X1 { };
}
// Check the syntax of explicit instantiations.
template class X0<int, float>;
template class X0<int>; // expected-note{{previous}}
template class N::X1<int>;
template class ::N::X1<int, float>;
using namespace N;
template class X1<float>;
// Check for some bogus syntax that probably means that the user
// wanted to write an explicit specialization, but forgot the '<>'
// after 'template'.
template class X0<double> { }; // expected-error{{explicit specialization}}
// Check for explicit instantiations that come after other kinds of
// instantiations or declarations.
template class X0<int, int>; // expected-error{{duplicate}}
template<> class X0<char> { }; // expected-note{{previous}}
template class X0<char>; // expected-warning{{ignored}}
void foo(X0<short>) { }
template class X0<short>;
// Check that explicit instantiations actually produce definitions. We
// determine whether this happens by placing semantic errors in the
// definition of the template we're instantiating.
template<typename T> struct X2; // expected-note{{declared here}}
template struct X2<float>; // expected-error{{undefined template}}
template<typename T>
struct X2 {
void f0(T*); // expected-error{{pointer to a reference}}
};
template struct X2<int>; // okay
template struct X2<int&>; // expected-note{{in instantiation of}}
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