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