420fa12dfd
based on whether "redundant" braces are ever reasonable as part of the initialization of the entity, rather than whether the initialization is "top-level". In passing, add a warning flag for it. llvm-svn: 228896
410 lines
10 KiB
C++
410 lines
10 KiB
C++
// RUN: %clang_cc1 -std=c++0x -fsyntax-only -fexceptions -verify %s
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struct one { char c[1]; };
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struct two { char c[2]; };
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namespace std {
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typedef decltype(sizeof(int)) size_t;
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// libc++'s implementation
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template <class _E>
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class initializer_list
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{
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const _E* __begin_;
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size_t __size_;
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initializer_list(const _E* __b, size_t __s)
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: __begin_(__b),
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__size_(__s)
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{}
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public:
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typedef _E value_type;
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typedef const _E& reference;
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typedef const _E& const_reference;
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typedef size_t size_type;
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typedef const _E* iterator;
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typedef const _E* const_iterator;
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initializer_list() : __begin_(nullptr), __size_(0) {}
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size_t size() const {return __size_;}
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const _E* begin() const {return __begin_;}
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const _E* end() const {return __begin_ + __size_;}
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};
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}
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namespace objects {
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struct X1 { X1(int); };
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struct X2 { explicit X2(int); }; // expected-note {{constructor declared here}}
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template <int N>
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struct A {
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A() { static_assert(N == 0, ""); }
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A(int, double) { static_assert(N == 1, ""); }
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};
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template <int N>
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struct F {
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F() { static_assert(N == 0, ""); }
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F(int, double) { static_assert(N == 1, ""); }
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F(std::initializer_list<int>) { static_assert(N == 3, ""); }
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};
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template <int N>
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struct D {
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D(std::initializer_list<int>) { static_assert(N == 0, ""); } // expected-note 1 {{candidate}}
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D(std::initializer_list<double>) { static_assert(N == 1, ""); } // expected-note 1 {{candidate}}
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};
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template <int N>
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struct E {
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E(int, int) { static_assert(N == 0, ""); }
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E(X1, int) { static_assert(N == 1, ""); }
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};
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void overload_resolution() {
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{ A<0> a{}; }
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{ A<0> a = {}; }
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{ A<1> a{1, 1.0}; }
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{ A<1> a = {1, 1.0}; }
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{ F<0> f{}; }
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{ F<0> f = {}; }
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// Narrowing conversions don't affect viability. The next two choose
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// the initializer_list constructor.
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{ F<3> f{1, 1.0}; } // expected-error {{type 'double' cannot be narrowed to 'int' in initializer list}} expected-note {{silence}}
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{ F<3> f = {1, 1.0}; } // expected-error {{type 'double' cannot be narrowed to 'int' in initializer list}} expected-note {{silence}}
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{ F<3> f{1, 2, 3, 4, 5, 6, 7, 8}; }
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{ F<3> f = {1, 2, 3, 4, 5, 6, 7, 8}; }
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{ F<3> f{1, 2, 3, 4, 5, 6, 7, 8}; }
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{ F<3> f{1, 2}; }
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{ D<0> d{1, 2, 3}; }
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{ D<1> d{1.0, 2.0, 3.0}; }
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{ D<-1> d{1, 2.0}; } // expected-error {{ambiguous}}
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{ E<0> e{1, 2}; }
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}
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void explicit_implicit() {
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{ X1 x{0}; }
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{ X1 x = {0}; }
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{ X2 x{0}; }
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{ X2 x = {0}; } // expected-error {{constructor is explicit}}
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}
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struct C {
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C();
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C(int, double);
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C(int, int);
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int operator[](C);
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};
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C function_call() {
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void takes_C(C);
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takes_C({1, 1.0});
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C c;
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c[{1, 1.0}];
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return {1, 1.0};
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}
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void inline_init() {
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(void) C{1, 1.0};
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(void) new C{1, 1.0};
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(void) A<1>{1, 1.0};
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(void) new A<1>{1, 1.0};
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}
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struct B { // expected-note 2 {{candidate constructor}}
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B(C, int, C); // expected-note {{candidate constructor not viable: cannot convert initializer list argument to 'objects::C'}}
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};
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void nested_init() {
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B b1{{1, 1.0}, 2, {3, 4}};
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B b2{{1, 1.0, 4}, 2, {3, 4}}; // expected-error {{no matching constructor for initialization of 'objects::B'}}
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}
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void overloaded_call() {
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one ov1(B); // expected-note {{not viable: cannot convert initializer list}}
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two ov1(C); // expected-note {{not viable: cannot convert initializer list}}
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static_assert(sizeof(ov1({})) == sizeof(two), "bad overload");
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static_assert(sizeof(ov1({1, 2})) == sizeof(two), "bad overload");
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static_assert(sizeof(ov1({{1, 1.0}, 2, {3, 4}})) == sizeof(one), "bad overload");
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ov1({1}); // expected-error {{no matching function}}
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one ov2(int);
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two ov2(F<3>);
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// expected-warning@+1 {{braces around scalar initializer}}
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static_assert(sizeof(ov2({1})) == sizeof(one), "bad overload"); // list -> int ranks as identity
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static_assert(sizeof(ov2({1, 2, 3})) == sizeof(two), "bad overload"); // list -> F only viable
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}
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struct G { // expected-note 6 {{not viable}}
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// This is not an initializer-list constructor.
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template<typename ...T>
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G(std::initializer_list<int>, T ...); // expected-note 3 {{not viable}}
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};
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struct H { // expected-note 6 {{not viable}}
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explicit H(int, int); // expected-note 3 {{not viable}} expected-note {{declared here}}
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H(int, void*); // expected-note 3 {{not viable}}
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};
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void edge_cases() {
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// invalid (the first phase only considers init-list ctors)
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// (for the second phase, no constructor is viable)
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G g1{1, 2, 3}; // expected-error {{no matching constructor}}
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(void) new G{1, 2, 3}; // expected-error {{no matching constructor}}
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(void) G{1, 2, 3} // expected-error {{no matching constructor}}
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// valid (T deduced to <>).
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G g2({1, 2, 3});
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(void) new G({1, 2, 3});
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(void) G({1, 2, 3});
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// invalid
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H h1({1, 2}); // expected-error {{no matching constructor}}
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(void) new H({1, 2}); // expected-error {{no matching constructor}}
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// FIXME: Bad diagnostic, mentions void type instead of init list.
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(void) H({1, 2}); // expected-error {{no matching conversion}}
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// valid (by copy constructor).
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H h2({1, nullptr});
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(void) new H({1, nullptr});
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(void) H({1, nullptr});
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// valid
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H h3{1, 2};
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(void) new H{1, 2};
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(void) H{1, 2};
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}
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struct memberinit {
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H h1{1, nullptr};
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H h2 = {1, nullptr};
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H h3{1, 1};
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H h4 = {1, 1}; // expected-error {{constructor is explicit}}
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};
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}
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namespace PR12092 {
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struct S {
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S(const char*);
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};
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struct V {
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template<typename T> V(T, T);
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void f(std::initializer_list<S>);
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void f(const V &);
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};
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void g() {
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extern V s;
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s.f({"foo", "bar"});
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}
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}
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namespace PR12117 {
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struct A { A(int); };
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struct B { B(A); } b{{0}}; //FIXME: non-conformant. Temporary fix until standard resolution.
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// expected- error {{call to constructor of 'struct B' is ambiguous}} \
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// expected- note 2{{candidate is the implicit}} \
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// expected- note {{candidate constructor}}
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struct C { C(int); } c{0};
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}
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namespace PR12167 {
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template<int N> struct string {};
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struct X {
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X(const char v);
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template<typename T> bool operator()(T) const;
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};
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template<int N, class Comparator> bool g(const string<N>& s, Comparator cmp) {
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return cmp(s);
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}
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template<int N> bool f(const string<N> &s) {
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return g(s, X{'x'});
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}
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bool s = f(string<1>());
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}
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namespace PR12257_PR12241 {
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struct command_pair
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{
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command_pair(int, int);
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};
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struct command_map
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{
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command_map(std::initializer_list<command_pair>);
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};
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struct generator_pair
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{
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generator_pair(const command_map);
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};
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// 5 levels: init list, gen_pair, command_map, init list, command_pair
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const std::initializer_list<generator_pair> x = {{{{{3, 4}}}}};
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// 4 levels: init list, gen_pair, command_map via init list, command_pair
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const std::initializer_list<generator_pair> y = {{{{1, 2}}}};
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}
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namespace PR12120 {
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struct A { explicit A(int); A(float); }; // expected-note {{declared here}}
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A a = { 0 }; // expected-error {{constructor is explicit}}
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struct B { explicit B(short); B(long); }; // expected-note 2 {{candidate}}
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B b = { 0 }; // expected-error {{ambiguous}}
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}
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namespace PR12498 {
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class ArrayRef; // expected-note{{forward declaration}}
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struct C {
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void foo(const ArrayRef&); // expected-note{{passing argument to parameter here}}
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};
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static void bar(C* c)
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{
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c->foo({ nullptr, 1 }); // expected-error{{initialization of incomplete type 'const PR12498::ArrayRef'}}
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}
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}
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namespace explicit_default {
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struct A {
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explicit A(); // expected-note{{here}}
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};
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A a {}; // ok
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// This is copy-list-initialization, and we choose an explicit constructor
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// (even though we do so via value-initialization), so the initialization is
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// ill-formed.
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A b = {}; // expected-error{{chosen constructor is explicit}}
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}
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namespace init_list_default {
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struct A {
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A(std::initializer_list<int>);
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};
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A a {}; // calls initializer list constructor
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struct B {
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B();
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B(std::initializer_list<int>) = delete;
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};
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B b {}; // calls default constructor
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}
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// PR13470, <rdar://problem/11974632>
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namespace PR13470 {
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struct W {
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explicit W(int); // expected-note {{here}}
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};
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struct X {
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X(const X&) = delete; // expected-note 3 {{here}}
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X(int);
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};
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template<typename T, typename Fn> void call(Fn f) {
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f({1}); // expected-error {{constructor is explicit}}
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f(T{1}); // expected-error {{call to deleted constructor}}
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}
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void ref_w(const W &); // expected-note 2 {{not viable}}
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void call_ref_w() {
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ref_w({1}); // expected-error {{no matching function}}
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ref_w(W{1});
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call<W>(ref_w); // expected-note {{instantiation of}}
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}
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void ref_x(const X &);
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void call_ref_x() {
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ref_x({1});
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ref_x(X{1});
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call<X>(ref_x); // ok
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}
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void val_x(X); // expected-note 2 {{parameter}}
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void call_val_x() {
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val_x({1});
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val_x(X{1}); // expected-error {{call to deleted constructor}}
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call<X>(val_x); // expected-note {{instantiation of}}
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}
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template<typename T>
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struct Y {
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X x{1};
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void f() { X x{1}; }
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void h() {
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ref_w({1}); // expected-error {{no matching function}}
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ref_w(W{1});
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ref_x({1});
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ref_x(X{1});
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val_x({1});
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val_x(X{1}); // expected-error {{call to deleted constructor}}
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}
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Y() {}
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Y(int) : x{1} {}
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};
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Y<int> yi;
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Y<int> yi2(0);
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void g() {
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yi.f();
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yi.h(); // ok, all diagnostics produced in template definition
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}
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}
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namespace PR19729 {
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struct A {
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A(int);
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A(const A&) = delete;
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};
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struct B {
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void *operator new(std::size_t, A);
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};
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B *p = new ({123}) B;
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}
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namespace PR11410 {
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struct A {
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A() = delete; // expected-note 2{{deleted here}}
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A(int);
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};
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A a[3] = {
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{1}, {2}
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}; // expected-error {{call to deleted constructor}} \
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expected-note {{in implicit initialization of array element 2 with omitted initializer}}
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struct B {
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A a; // expected-note {{in implicit initialization of field 'a'}}
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} b = {
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}; // expected-error {{call to deleted constructor}}
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struct C {
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C(int = 0); // expected-note 2{{candidate}}
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C(float = 0); // expected-note 2{{candidate}}
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};
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C c[3] = {
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0, 1
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}; // expected-error {{ambiguous}} expected-note {{in implicit initialization of array element 2}}
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C c2[3] = {
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[0] = 1, [2] = 3
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}; // expected-error {{ambiguous}} expected-note {{in implicit initialization of array element 1}}
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}
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