| // 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 'int const' to a value of type 'int const volatile' 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 { |
| int& okay; |
| }; |
| |
| struct C : B, A { }; |
| |
| void test7(C& c) { |
| A& a1 = c; // expected-error {{ambiguous conversion from derived class 'struct C' to base class 'struct 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; |
| } |