forked from OSchip/llvm-project
140 lines
3.4 KiB
C++
140 lines
3.4 KiB
C++
// RUN: %clang_cc1 -fsyntax-only -verify %s
|
|
int g(int);
|
|
|
|
void f() {
|
|
int i;
|
|
int &r = i;
|
|
r = 1;
|
|
int *p = &r;
|
|
int &rr = r;
|
|
int (&rg)(int) = g;
|
|
rg(i);
|
|
int a[3];
|
|
int (&ra)[3] = a;
|
|
ra[1] = i;
|
|
int *Q;
|
|
int *& P = Q;
|
|
P[1] = 1;
|
|
}
|
|
|
|
typedef int t[1];
|
|
void test2() {
|
|
t a;
|
|
t& b = a;
|
|
|
|
|
|
int c[3];
|
|
int (&rc)[3] = c;
|
|
}
|
|
|
|
// C++ [dcl.init.ref]p5b1
|
|
struct A { };
|
|
struct B : A { } b;
|
|
|
|
void test3() {
|
|
double d = 2.0;
|
|
double& rd = d; // rd refers to d
|
|
const double& rcd = d; // rcd refers to d
|
|
|
|
A& ra = b; // ra refers to A subobject in b
|
|
const A& rca = b; // rca refers to A subobject in b
|
|
}
|
|
|
|
B fB();
|
|
|
|
// C++ [dcl.init.ref]p5b2
|
|
void test4() {
|
|
double& rd2 = 2.0; // expected-error{{non-const lvalue reference to type 'double' cannot bind to a temporary of type 'double'}}
|
|
int i = 2;
|
|
double& rd3 = i; // expected-error{{non-const lvalue reference to type 'double' cannot bind to a value of unrelated type 'int'}}
|
|
|
|
const A& rca = fB();
|
|
}
|
|
|
|
void test5() {
|
|
// const double& rcd2 = 2; // rcd2 refers to temporary with value 2.0
|
|
const volatile int cvi = 1;
|
|
const int& r = cvi; // expected-error{{binding of reference to type 'const int' to a value of type 'const volatile int' drops qualifiers}}
|
|
}
|
|
|
|
// C++ [dcl.init.ref]p3
|
|
int& test6(int& x) {
|
|
int& yo; // expected-error{{declaration of reference variable 'yo' requires an initializer}}
|
|
|
|
return x;
|
|
}
|
|
int& not_initialized_error; // expected-error{{declaration of reference variable 'not_initialized_error' requires an initializer}}
|
|
extern int& not_initialized_okay;
|
|
|
|
class Test6 { // expected-warning{{class 'Test6' does not declare any constructor to initialize its non-modifiable members}}
|
|
int& okay; // expected-note{{reference member 'okay' will never be initialized}}
|
|
};
|
|
|
|
struct C : B, A { };
|
|
|
|
void test7(C& c) {
|
|
A& a1 = c; // expected-error {{ambiguous conversion from derived class 'C' to base class 'A':}}
|
|
}
|
|
|
|
// C++ [dcl.ref]p1, C++ [dcl.ref]p4
|
|
void test8(int& const,// expected-error{{'const' qualifier may not be applied to a reference}}
|
|
|
|
void&, // expected-error{{cannot form a reference to 'void'}}
|
|
int& &) // expected-error{{type name declared as a reference to a reference}}
|
|
{
|
|
typedef int& intref;
|
|
typedef intref& intrefref; // C++ DR 106: reference collapsing
|
|
|
|
typedef intref const intref_c; // okay. FIXME: how do we verify that this is the same type as intref?
|
|
}
|
|
|
|
|
|
class string {
|
|
char *Data;
|
|
unsigned Length;
|
|
public:
|
|
string();
|
|
~string();
|
|
};
|
|
|
|
string getInput();
|
|
|
|
void test9() {
|
|
string &s = getInput(); // expected-error{{lvalue reference}}
|
|
}
|
|
|
|
void test10() {
|
|
__attribute((vector_size(16))) typedef int vec4;
|
|
typedef __attribute__(( ext_vector_type(4) )) int ext_vec4;
|
|
|
|
vec4 v;
|
|
int &a = v[0]; // expected-error{{non-const reference cannot bind to vector element}}
|
|
const int &b = v[0];
|
|
|
|
ext_vec4 ev;
|
|
int &c = ev.x; // expected-error{{non-const reference cannot bind to vector element}}
|
|
const int &d = ev.x;
|
|
}
|
|
|
|
namespace PR7149 {
|
|
template<typename T> struct X0
|
|
{
|
|
T& first;
|
|
X0(T& p1) : first(p1) { }
|
|
};
|
|
|
|
|
|
void f()
|
|
{
|
|
int p1[1];
|
|
X0< const int[1]> c(p1);
|
|
}
|
|
}
|
|
|
|
namespace PR8608 {
|
|
bool& f(unsigned char& c) { return (bool&)c; }
|
|
}
|
|
|
|
// The following crashed trying to recursively evaluate the LValue.
|
|
const int &do_not_crash = do_not_crash; // expected-warning{{reference 'do_not_crash' is not yet bound to a value when used within its own initialization}}
|