forked from OSchip/llvm-project
105 lines
2.4 KiB
C++
105 lines
2.4 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 of reference to type 'int const' to a value of type 'int const volatile' drops qualifiers}}
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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 {
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int& okay;
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};
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struct C : B, A { };
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void test7(C& c) {
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A& a1 = c; // expected-error {{ambiguous conversion from derived class 'struct C' to base class 'struct 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; // okay. FIXME: how do we verify that this is the same type as intref?
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}
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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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