151 lines
3.8 KiB
C++
151 lines
3.8 KiB
C++
// RUN: %clang_cc1 -fsyntax-only -verify -pedantic -Wc++11-compat %s
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//
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// Tests explicit instantiation of templates.
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template<typename T, typename U = T> class X0 { };
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namespace N {
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template<typename T, typename U = T> class X1 { };
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}
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// Check the syntax of explicit instantiations.
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template class X0<int, float>;
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template class X0<int>; // expected-note{{previous}}
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template class N::X1<int>;
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template class ::N::X1<int, float>;
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using namespace N;
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// Check for some bogus syntax that probably means that the user
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// wanted to write an explicit specialization, but forgot the '<>'
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// after 'template'.
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template class X0<double> { }; // expected-error{{explicit specialization}}
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// Check for explicit instantiations that come after other kinds of
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// instantiations or declarations.
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template class X0<int, int>; // expected-error{{duplicate}}
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template<> class X0<char> { }; // expected-note{{previous}}
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template class X0<char>; // expected-warning{{ignored}}
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void foo(X0<short>) { }
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template class X0<short>;
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// Check that explicit instantiations actually produce definitions. We
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// determine whether this happens by placing semantic errors in the
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// definition of the template we're instantiating.
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template<typename T> struct X2; // expected-note{{declared here}}
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template struct X2<float>; // expected-error{{undefined template}}
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template<typename T>
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struct X2 {
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void f0(T*); // expected-error{{pointer to a reference}}
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};
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template struct X2<int>; // okay
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template struct X2<int&>; // expected-note{{in instantiation of}}
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// Check that explicit instantiations instantiate member classes.
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template<typename T> struct X3 {
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struct Inner {
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void f(T*); // expected-error{{pointer to a reference}}
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};
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};
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void f1(X3<int&>); // okay, Inner, not instantiated
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template struct X3<int&>; // expected-note{{instantiation}}
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template<typename T> struct X4 {
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struct Inner {
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struct VeryInner {
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void f(T*); // expected-error 2{{pointer to a reference}}
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};
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};
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};
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void f2(X4<int&>); // okay, Inner, not instantiated
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void f3(X4<int&>::Inner); // okay, Inner::VeryInner, not instantiated
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template struct X4<int&>; // expected-note{{instantiation}}
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template struct X4<float&>; // expected-note{{instantiation}}
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// Check explicit instantiation of member classes
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namespace N2 {
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template<typename T>
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struct X5 {
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struct Inner1 {
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void f(T&);
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};
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struct Inner2 { // expected-note {{here}}
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struct VeryInner {
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void g(T*); // expected-error 2{{pointer to a reference}}
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};
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};
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};
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}
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template struct N2::X5<void>::Inner2;
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using namespace N2;
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template struct X5<int&>::Inner2; // expected-note{{instantiation}}
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void f4(X5<float&>::Inner2);
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template struct X5<float&>::Inner2; // expected-note{{instantiation}}
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namespace N3 {
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template struct N2::X5<int>::Inner2; // expected-warning {{explicit instantiation of 'Inner2' not in a namespace enclosing 'N2'}}
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}
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struct X6 {
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struct Inner { // expected-note{{here}}
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void f();
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};
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};
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template struct X6::Inner; // expected-error{{non-templated}}
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// PR5559
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template <typename T>
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struct Foo;
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template <>
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struct Foo<int> // expected-note{{header not required for explicitly-specialized}}
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{
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template <typename U>
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struct Bar
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{};
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};
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template <> // expected-warning{{extraneous template parameter list}}
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template <>
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struct Foo<int>::Bar<void>
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{};
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namespace N1 {
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template<typename T> struct X7 { }; // expected-note{{here}}
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namespace Inner {
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template<typename T> struct X8 { };
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}
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template struct X7<int>;
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template struct Inner::X8<int>;
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}
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template<typename T> struct X9 { }; // expected-note{{here}}
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template struct ::N1::Inner::X8<float>;
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namespace N2 {
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using namespace N1;
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template struct X7<double>; // expected-warning{{must occur in namespace}}
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template struct X9<float>; // expected-warning{{must occur at global scope}}
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}
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