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74 lines
2.7 KiB
74 lines
2.7 KiB
4 months ago
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// RUN: %clang_cc1 -fsyntax-only -verify -std=c++98 %s
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// RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 %s
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// RUN: %clang_cc1 -fsyntax-only -verify %s
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// A program that calls for default-initialization or value-initialization of
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// an entity of reference type is illformed. If T is a cv-qualified type, the
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// cv-unqualified version of T is used for these definitions of
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// zero-initialization, default-initialization, and value-initialization.
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typedef int &IR;
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IR r; // expected-error {{declaration of reference variable 'r' requires an initializer}}
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int n = IR(); // expected-error {{reference to type 'int' requires an initializer}}
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#if __cplusplus < 201103L
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struct S { // expected-error {{implicit default constructor for 'S' must explicitly initialize the reference member}}
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int &x; // expected-note {{declared here}} expected-error 3{{reference to type 'int' requires an initializer}}
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};
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S s; // expected-note {{implicit default constructor for 'S' first required here}}
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S f() {
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return S(); // expected-note {{in value-initialization of type 'S' here}}
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}
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struct T
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: S { // expected-note 2{{in value-initialization of type 'S' here}}
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};
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T t = T(); // expected-note {{in value-initialization of type 'T' here}}
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struct U {
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T t[3]; // expected-note {{in value-initialization of type 'T' here}}
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};
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U u = U(); // expected-note {{in value-initialization of type 'U' here}}
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#else
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struct S {
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int &x; // expected-note 4{{because field 'x' of reference type 'int &' would not be initialized}}
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};
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S s; // expected-error {{deleted default constructor}}
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S f() {
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return S(); // expected-error {{deleted default constructor}}
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}
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struct T
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: S { // expected-note 2{{because base class 'S' has a deleted default constructor}}
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};
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T t = T(); // expected-error {{deleted default constructor}}
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struct U {
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T t[3]; // expected-note {{because field 't' has a deleted default constructor}}
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};
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U u = U(); // expected-error {{deleted default constructor}}
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#endif
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// Ensure that we handle C++11 in-class initializers properly as an extension.
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// In this case, there is no user-declared default constructor, so we
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// recursively apply the value-initialization checks, but we will emit a
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// constructor call anyway, because the default constructor is not trivial.
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struct V {
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int n;
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int &r = n; // expected-warning 0-1{{C++11}}
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};
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V v = V(); // ok
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struct W {
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int n;
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S s = { n }; // expected-warning 0-1{{C++11}}
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};
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W w = W(); // ok
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// Ensure we're not faking this up by making the default constructor
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// non-trivial.
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_Static_assert(__has_trivial_constructor(S), "");
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_Static_assert(__has_trivial_constructor(T), "");
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_Static_assert(__has_trivial_constructor(U), "");
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_Static_assert(!__has_trivial_constructor(V), "");
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_Static_assert(!__has_trivial_constructor(W), "");
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