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// RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 %s
template <class T>
struct only
{
only(T) {}
template <class U>
only(U)
{
static_assert(sizeof(U) == 0, "expected type failure");
}
};
auto f() -> int
{
return 0;
}
auto g(); // expected-error{{return without trailing return type; deduced return types are a C++14 extension}}
decltype(auto) g2(); // expected-warning{{extension}} expected-error-re{{{{^}}deduced return types are a C++14 extension}}
auto badness = g2();
int h() -> int; // expected-error{{trailing return type must specify return type 'auto', not 'int'}}
int i();
auto i() -> int;
int i() {}
using T = auto (int) -> auto (*)(char) -> void; // expected-note {{previous}}
using T = void; // expected-error {{type alias redefinition with different types ('void' vs 'auto (int) -> auto (*)(char) -> void')}}
using U = auto (int) -> auto (*)(char) -> void;
using U = void (*(int))(char); // ok
int x;
template <class T>
auto i(T x) -> decltype(x)
{
return x;
}
only<double> p1 = i(1.0);
template <class T>
struct X
{
auto f(T x) -> T { return x; }
template <class U>
auto g(T x, U y) -> decltype(x + y)
{
return x + y;
}
template<typename U>
struct nested {
template <class V>
auto h(T x, U y, V z) -> decltype(x + y + z)
{
return x + y + z;
}
};
template<typename U>
nested<U> get_nested();
};
X<int> xx;
only<int> p2 = xx.f(0L);
only<double> p3 = xx.g(0L, 1.0);
only<double> p4 = xx.get_nested<double>().h(0L, 1.0, 3.14f);
namespace PR12053 {
template <typename T>
auto f1(T t) -> decltype(f1(t)) {} // expected-note{{candidate template ignored}}
void test_f1() {
f1(0); // expected-error{{no matching function for call to 'f1'}}
}
template <typename T>
auto f2(T t) -> decltype(f2(&t)) {} // expected-note{{candidate template ignored}}
void test_f2() {
f2(0); // expected-error{{no matching function for call to 'f2'}}
}
}
namespace DR1608 {
struct S {
void operator+();
int operator[](int);
auto f() -> decltype(+*this); // expected-note {{here}}
auto f() -> decltype((*this)[0]); // expected-error {{cannot be overloaded}}
};
}
namespace PR16273 {
struct A {
template <int N> void f();
auto g()->decltype(this->f<0>());
};
}
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