forked from OSchip/llvm-project
100 lines
2.5 KiB
C++
100 lines
2.5 KiB
C++
// RUN: clang-cc -fsyntax-only -verify %s
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template<typename T, typename U = int> struct A; // expected-note 2{{template is declared here}}
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template<> struct A<double, double>; // expected-note{{forward declaration}}
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template<> struct A<float, float> { // expected-note{{previous definition}}
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int x;
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};
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template<> struct A<float> { // expected-note{{previous definition}}
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int y;
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};
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int test_specs(A<float, float> *a1, A<float, int> *a2) {
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return a1->x + a2->y;
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}
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int test_incomplete_specs(A<double, double> *a1,
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A<double> *a2)
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{
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(void)a1->x; // expected-error{{incomplete definition of type 'A<double, double>'}}
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(void)a2->x; // expected-error{{implicit instantiation of undefined template 'struct A<double, int>'}}
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}
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typedef float FLOAT;
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template<> struct A<float, FLOAT>;
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template<> struct A<FLOAT, float> { }; // expected-error{{redefinition}}
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template<> struct A<float, int> { }; // expected-error{{redefinition}}
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template<typename T, typename U = int> struct X;
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template <> struct X<int, int> { int foo(); }; // #1
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template <> struct X<float> { int bar(); }; // #2
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typedef int int_type;
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void testme(X<int_type> *x1, X<float, int> *x2) {
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(void)x1->foo(); // okay: refers to #1
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(void)x2->bar(); // okay: refers to #2
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}
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// Make sure specializations are proper classes.
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template<>
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struct A<char> {
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A();
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};
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A<char>::A() { }
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// Make sure we can see specializations defined before the primary template.
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namespace N{
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template<typename T> struct A0;
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}
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namespace N {
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template<>
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struct A0<void> {
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typedef void* pointer;
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};
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}
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namespace N {
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template<typename T>
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struct A0 {
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void foo(A0<void>::pointer p = 0);
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};
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}
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// Diagnose specialization errors
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struct A<double> { }; // expected-error{{template specialization requires 'template<>'}}
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template<> struct ::A<double>;
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namespace N {
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template<typename T> struct B; // expected-note 2{{template is declared here}}
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template<> struct ::N::B<char>; // okay
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template<> struct ::N::B<short>; // okay
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template<> struct ::N::B<int>; // okay
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int f(int);
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}
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template<> struct N::B<int> { }; // okay
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template<> struct N::B<float> { }; // expected-error{{class template specialization of 'B' not in namespace 'N'}}
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namespace M {
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template<> struct ::N::B<short> { }; // expected-error{{class template specialization of 'B' not in a namespace enclosing 'N'}}
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template<> struct ::A<long double>; // expected-error{{class template specialization of 'A' must occur in the global scope}}
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}
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template<> struct N::B<char> {
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int testf(int x) { return f(x); }
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};
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