forked from OSchip/llvm-project
95 lines
3.0 KiB
C++
95 lines
3.0 KiB
C++
// RUN: %clang_cc1 -fcxx-exceptions -fexceptions -fsyntax-only -verify -std=c++11 %s
|
|
|
|
typedef int&& irr;
|
|
typedef irr& ilr_c1; // Collapses to int&
|
|
typedef int& ilr;
|
|
typedef ilr&& ilr_c2; // Collapses to int&
|
|
|
|
irr ret_irr() {
|
|
return 0; // expected-warning {{returning reference to local temporary}}
|
|
}
|
|
|
|
struct not_int {};
|
|
|
|
int over(int&);
|
|
not_int over(int&&);
|
|
|
|
int over2(const int&);
|
|
not_int over2(int&&);
|
|
|
|
struct conv_to_not_int_rvalue {
|
|
operator not_int &&();
|
|
};
|
|
|
|
typedef void (fun_type)();
|
|
void fun();
|
|
fun_type &&make_fun();
|
|
|
|
void f() {
|
|
int &&virr1; // expected-error {{declaration of reference variable 'virr1' requires an initializer}}
|
|
int &&virr2 = 0;
|
|
int &&virr3 = virr2; // expected-error {{rvalue reference to type 'int' cannot bind to lvalue of type 'int'}}
|
|
int i1 = 0;
|
|
int &&virr4 = i1; // expected-error {{rvalue reference to type 'int' cannot bind to lvalue of type 'int'}}
|
|
int &&virr5 = ret_irr();
|
|
int &&virr6 = static_cast<int&&>(i1);
|
|
(void)static_cast<not_int&&>(i1); // expected-error {{types are not compatible}}
|
|
|
|
int i2 = over(i1);
|
|
not_int ni1 = over(0);
|
|
int i3 = over(virr2);
|
|
not_int ni2 = over(ret_irr());
|
|
|
|
int i4 = over2(i1);
|
|
not_int ni3 = over2(0);
|
|
|
|
ilr_c1 vilr1 = i1;
|
|
ilr_c2 vilr2 = i1;
|
|
|
|
conv_to_not_int_rvalue cnir;
|
|
not_int &&ni4 = cnir;
|
|
not_int &ni5 = cnir; // expected-error{{non-const lvalue reference to type 'not_int' cannot bind to a value of unrelated type 'conv_to_not_int_rvalue'}}
|
|
not_int &&ni6 = conv_to_not_int_rvalue();
|
|
|
|
fun_type &&fun_ref = fun; // works because functions are special
|
|
fun_type &&fun_ref2 = make_fun(); // same
|
|
fun_type &fun_lref = make_fun(); // also special
|
|
|
|
try {
|
|
} catch(int&&) { // expected-error {{cannot catch exceptions by rvalue reference}}
|
|
}
|
|
}
|
|
|
|
int&& should_warn(int i) {
|
|
// FIXME: The stack address return test doesn't reason about casts.
|
|
return static_cast<int&&>(i); // xpected-warning {{returning reference to temporary}}
|
|
}
|
|
int&& should_not_warn(int&& i) { // But GCC 4.4 does
|
|
return static_cast<int&&>(i);
|
|
}
|
|
|
|
|
|
// Test the return dance. This also tests IsReturnCopyElidable.
|
|
struct MoveOnly {
|
|
MoveOnly();
|
|
MoveOnly(const MoveOnly&) = delete; // expected-note {{candidate constructor}} \
|
|
// expected-note 3{{explicitly marked deleted here}}
|
|
MoveOnly(MoveOnly&&); // expected-note {{candidate constructor}}
|
|
MoveOnly(int&&); // expected-note {{candidate constructor}}
|
|
};
|
|
|
|
MoveOnly gmo;
|
|
MoveOnly returningNonEligible() {
|
|
int i;
|
|
static MoveOnly mo;
|
|
MoveOnly &r = mo;
|
|
if (0) // Copy from global can't be elided
|
|
return gmo; // expected-error {{call to deleted constructor}}
|
|
else if (0) // Copy from local static can't be elided
|
|
return mo; // expected-error {{call to deleted constructor}}
|
|
else if (0) // Copy from reference can't be elided
|
|
return r; // expected-error {{call to deleted constructor}}
|
|
else // Construction from different type can't be elided
|
|
return i; // expected-error {{no viable conversion from returned value of type 'int' to function return type 'MoveOnly'}}
|
|
}
|