77 lines
2.3 KiB
C++
77 lines
2.3 KiB
C++
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// RUN: %clang_cc1 -fsyntax-only -verify -std=c++1z %s
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// C++1z [temp.local]p1:
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// Like normal (non-template) classes, class templates have an
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// injected-class-name (Clause 9). The injected-class-name can
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// be used as a template-name or a type-name.
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template<typename> char id;
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template<typename> struct TempType {};
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template<template<typename> class> struct TempTemp {};
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template<typename> void use(int&); // expected-note {{invalid explicitly-specified argument}} expected-note {{no known conversion}}
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template<template<typename> class> void use(float&); // expected-note 2{{no known conversion}}
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template<int> void use(char&); // expected-note 2{{invalid explicitly-specified argument}}
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template<typename T> struct A {
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template<typename> struct C {};
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struct B : C<T> {
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// When it is used with a template-argument-list,
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A<int> *aint;
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typename B::template C<int> *cint;
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// as a template-argument for a template template-parameter,
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TempTemp<A> a_as_temp;
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TempTemp<B::template C> c_as_temp;
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// or as the final identifier in the elaborated-type-specifier of a friend
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// class template declaration,
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template<typename U> friend struct A;
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// it refers to the class template itself.
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// Otherwise, it is equivalent to the template-name followed by the
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// template-parameters of the class template enclosed in <>.
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A *aT;
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typename B::C *cT;
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TempType<A> a_as_type;
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TempType<typename B::C> c_as_type;
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friend struct A;
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friend struct B::C;
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void f(T &t) {
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use<A>(t); // expected-error {{no matching function}}
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if constexpr (&id<T> != &id<int>)
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use<B::template C>(t); // expected-error {{no matching function}}
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}
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};
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};
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template struct A<int>;
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template struct A<float>;
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template struct A<char>; // expected-note {{instantiation of}}
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template <typename T> struct X0 {
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X0();
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~X0();
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X0 f(const X0&);
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};
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// Test non-type template parameters.
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template <int N1, const int& N2, const int* N3> struct X1 {
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X1();
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~X1();
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X1 f(const X1& x1a) { X1 x1b(x1a); return x1b; }
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};
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// When it is used with a template-argument-list, it refers to the specified
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// class template specialization, which could be the current specialization
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// or another specialization.
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// FIXME: Test this clause.
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int i = 42;
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void test() {
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X0<int> x0; (void)x0;
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X1<42, i, &i> x1; (void)x1;
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}
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