| 1 | // RUN: %clang_cc1 -fsyntax-only -verify -std=c++98 %s |
|---|
| 2 | // RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 %s |
|---|
| 3 | // RUN: %clang_cc1 -fsyntax-only -verify %s |
|---|
| 4 | |
|---|
| 5 | // A program that calls for default-initialization or value-initialization of |
|---|
| 6 | // an entity of reference type is illformed. If T is a cv-qualified type, the |
|---|
| 7 | // cv-unqualified version of T is used for these definitions of |
|---|
| 8 | // zero-initialization, default-initialization, and value-initialization. |
|---|
| 9 | |
|---|
| 10 | typedef int &IR; |
|---|
| 11 | IR r; // expected-error {{declaration of reference variable 'r' requires an initializer}} |
|---|
| 12 | int n = IR(); // expected-error {{reference to type 'int' requires an initializer}} |
|---|
| 13 | |
|---|
| 14 | #if __cplusplus < 201103L |
|---|
| 15 | struct S { // expected-error {{implicit default constructor for 'S' must explicitly initialize the reference member}} |
|---|
| 16 | int &x; // expected-note {{declared here}} expected-error 3{{reference to type 'int' requires an initializer}} |
|---|
| 17 | }; |
|---|
| 18 | S s; // expected-note {{implicit default constructor for 'S' first required here}} |
|---|
| 19 | S f() { |
|---|
| 20 | return S(); // expected-note {{in value-initialization of type 'S' here}} |
|---|
| 21 | } |
|---|
| 22 | |
|---|
| 23 | struct T |
|---|
| 24 | : S { // expected-note 2{{in value-initialization of type 'S' here}} |
|---|
| 25 | }; |
|---|
| 26 | T t = T(); // expected-note {{in value-initialization of type 'T' here}} |
|---|
| 27 | |
|---|
| 28 | struct U { |
|---|
| 29 | T t[3]; // expected-note {{in value-initialization of type 'T' here}} |
|---|
| 30 | }; |
|---|
| 31 | U u = U(); // expected-note {{in value-initialization of type 'U' here}} |
|---|
| 32 | #else |
|---|
| 33 | struct S { |
|---|
| 34 | int &x; // expected-note 4{{because field 'x' of reference type 'int &' would not be initialized}} |
|---|
| 35 | }; |
|---|
| 36 | S s; // expected-error {{deleted default constructor}} |
|---|
| 37 | S f() { |
|---|
| 38 | return S(); // expected-error {{deleted default constructor}} |
|---|
| 39 | } |
|---|
| 40 | |
|---|
| 41 | struct T |
|---|
| 42 | : S { // expected-note 2{{because base class 'S' has a deleted default constructor}} |
|---|
| 43 | }; |
|---|
| 44 | T t = T(); // expected-error {{deleted default constructor}} |
|---|
| 45 | |
|---|
| 46 | struct U { |
|---|
| 47 | T t[3]; // expected-note {{because field 't' has a deleted default constructor}} |
|---|
| 48 | }; |
|---|
| 49 | U u = U(); // expected-error {{deleted default constructor}} |
|---|
| 50 | #endif |
|---|
| 51 | |
|---|
| 52 | // Ensure that we handle C++11 in-class initializers properly as an extension. |
|---|
| 53 | // In this case, there is no user-declared default constructor, so we |
|---|
| 54 | // recursively apply the value-initialization checks, but we will emit a |
|---|
| 55 | // constructor call anyway, because the default constructor is not trivial. |
|---|
| 56 | struct V { |
|---|
| 57 | int n; |
|---|
| 58 | int &r = n; // expected-warning 0-1{{C++11}} |
|---|
| 59 | }; |
|---|
| 60 | V v = V(); // ok |
|---|
| 61 | struct W { |
|---|
| 62 | int n; |
|---|
| 63 | S s = { n }; // expected-warning 0-1{{C++11}} |
|---|
| 64 | }; |
|---|
| 65 | W w = W(); // ok |
|---|
| 66 | |
|---|
| 67 | // Ensure we're not faking this up by making the default constructor |
|---|
| 68 | // non-trivial. |
|---|
| 69 | _Static_assert(__has_trivial_constructor(S), ""); |
|---|
| 70 | _Static_assert(__has_trivial_constructor(T), ""); |
|---|
| 71 | _Static_assert(__has_trivial_constructor(U), ""); |
|---|
| 72 | _Static_assert(!__has_trivial_constructor(V), ""); |
|---|
| 73 | _Static_assert(!__has_trivial_constructor(W), ""); |
|---|
| 74 | |
|---|