157 lines
4.3 KiB
C++
157 lines
4.3 KiB
C++
// RUN: %clang_cc1 -fsyntax-only -verify %s
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int g(int);
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void f() {
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int i;
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int &r = i;
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r = 1;
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int *p = &r;
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int &rr = r;
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int (&rg)(int) = g;
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rg(i);
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int a[3];
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int (&ra)[3] = a;
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ra[1] = i;
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int *Q;
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int *& P = Q;
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P[1] = 1;
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}
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typedef int t[1];
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void test2() {
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t a;
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t& b = a;
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int c[3];
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int (&rc)[3] = c;
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}
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// C++ [dcl.init.ref]p5b1
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struct A { };
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struct B : A { } b;
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void test3() {
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double d = 2.0;
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double& rd = d; // rd refers to d
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const double& rcd = d; // rcd refers to d
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A& ra = b; // ra refers to A subobject in b
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const A& rca = b; // rca refers to A subobject in b
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}
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B fB();
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// C++ [dcl.init.ref]p5b2
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void test4() {
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double& rd2 = 2.0; // expected-error{{non-const lvalue reference to type 'double' cannot bind to a temporary of type 'double'}}
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int i = 2;
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double& rd3 = i; // expected-error{{non-const lvalue reference to type 'double' cannot bind to a value of unrelated type 'int'}}
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const A& rca = fB();
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}
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void test5() {
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// const double& rcd2 = 2; // rcd2 refers to temporary with value 2.0
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const volatile int cvi = 1;
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const int& r = cvi; // expected-error{{binding value of type 'const volatile int' to reference to type 'const int' drops 'volatile' qualifier}}
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}
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// C++ [dcl.init.ref]p3
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int& test6(int& x) {
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int& yo; // expected-error{{declaration of reference variable 'yo' requires an initializer}}
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return x;
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}
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int& not_initialized_error; // expected-error{{declaration of reference variable 'not_initialized_error' requires an initializer}}
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extern int& not_initialized_okay;
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class Test6 { // expected-warning{{class 'Test6' does not declare any constructor to initialize its non-modifiable members}}
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int& okay; // expected-note{{reference member 'okay' will never be initialized}}
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};
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struct C : B, A { }; // expected-warning {{direct base 'A' is inaccessible due to ambiguity:\n struct C -> struct B -> struct A\nstruct C -> struct A}}
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void test7(C& c) {
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A& a1 = c; // expected-error {{ambiguous conversion from derived class 'C' to base class 'A':}}
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}
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// C++ [dcl.ref]p1, C++ [dcl.ref]p4
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void test8(int& const,// expected-error{{'const' qualifier may not be applied to a reference}}
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void&, // expected-error{{cannot form a reference to 'void'}}
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int& &) // expected-error{{type name declared as a reference to a reference}}
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{
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typedef int& intref;
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typedef intref& intrefref; // C++ DR 106: reference collapsing
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typedef intref const intref_c; // expected-warning {{'const' qualifier on reference type 'intref' (aka 'int &') has no effect}}
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typedef intref_c intref; // ok, same type
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typedef intref volatile intref; // expected-warning {{'volatile' qualifier on reference type 'intref' (aka 'int &') has no effect}}
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typedef intref _Atomic intref; // expected-warning {{'_Atomic' qualifier on reference type 'intref' (aka 'int &') has no effect}}
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void restrict_ref(__restrict intref); // ok
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void restrict_ref(int &__restrict); // ok
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}
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template<typename T> int const_param(const T) {}
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int const_ref_param = const_param<int&>(const_ref_param); // no-warning
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class string {
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char *Data;
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unsigned Length;
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public:
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string();
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~string();
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};
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string getInput();
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void test9() {
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string &s = getInput(); // expected-error{{lvalue reference}}
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}
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void test10() {
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__attribute((vector_size(16))) typedef int vec4;
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typedef __attribute__(( ext_vector_type(4) )) int ext_vec4;
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vec4 v;
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int &a = v[0]; // expected-error{{non-const reference cannot bind to vector element}}
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const int &b = v[0];
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ext_vec4 ev;
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int &c = ev.x; // expected-error{{non-const reference cannot bind to vector element}}
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const int &d = ev.x;
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}
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namespace PR7149 {
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template<typename T> struct X0
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{
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T& first;
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X0(T& p1) : first(p1) { }
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};
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void f()
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{
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int p1[1];
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X0< const int[1]> c(p1);
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}
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}
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namespace PR8608 {
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bool& f(unsigned char& c) { return (bool&)c; }
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}
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// The following crashed trying to recursively evaluate the LValue.
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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}}
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namespace ExplicitRefInit {
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// This is invalid: we can't copy-initialize an 'A' temporary using an
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// explicit constructor.
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struct A { explicit A(int); };
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const A &a(0); // expected-error {{reference to type 'const ExplicitRefInit::A' could not bind to an rvalue of type 'int'}}
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}
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