285 lines
7.8 KiB
C++
285 lines
7.8 KiB
C++
// RUN: %clang_cc1 -std=c++11 -fsyntax-only -verify %s
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// This must obviously come before the definition of std::initializer_list.
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void missing_initializerlist() {
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auto l = {1, 2, 3, 4}; // expected-error {{std::initializer_list was not found}}
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}
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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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template <typename T, typename U>
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struct same_type { static const bool value = false; };
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template <typename T>
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struct same_type<T, T> { static const bool value = true; };
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struct one { char c[1]; };
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struct two { char c[2]; };
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struct A {
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int a, b;
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};
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struct B {
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B();
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B(int, int);
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};
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void simple_list() {
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std::initializer_list<int> il = { 1, 2, 3 };
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std::initializer_list<double> dl = { 1.0, 2.0, 3 };
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std::initializer_list<A> al = { {1, 2}, {2, 3}, {3, 4} };
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std::initializer_list<B> bl = { {1, 2}, {2, 3}, {} };
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}
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void function_call() {
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void f(std::initializer_list<int>);
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f({1, 2, 3});
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void g(std::initializer_list<B>);
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g({ {1, 2}, {2, 3}, {} });
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}
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struct C {
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C(int);
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};
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struct D {
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D();
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operator int();
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operator C();
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};
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void overloaded_call() {
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one overloaded(std::initializer_list<int>);
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two overloaded(std::initializer_list<B>);
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static_assert(sizeof(overloaded({1, 2, 3})) == sizeof(one), "bad overload");
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static_assert(sizeof(overloaded({ {1, 2}, {2, 3}, {} })) == sizeof(two), "bad overload");
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void ambiguous(std::initializer_list<A>); // expected-note {{candidate}}
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void ambiguous(std::initializer_list<B>); // expected-note {{candidate}}
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ambiguous({ {1, 2}, {2, 3}, {3, 4} }); // expected-error {{ambiguous}}
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one ov2(std::initializer_list<int>); // expected-note {{candidate}}
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two ov2(std::initializer_list<C>); // expected-note {{candidate}}
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// Worst sequence to int is identity, whereas to C it's user-defined.
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static_assert(sizeof(ov2({1, 2, 3})) == sizeof(one), "bad overload");
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// But here, user-defined is worst in both cases.
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ov2({1, 2, D()}); // expected-error {{ambiguous}}
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}
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template <typename T>
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T deduce(std::initializer_list<T>); // expected-note {{conflicting types for parameter 'T' ('int' vs. 'double')}}
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template <typename T>
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T deduce_ref(const std::initializer_list<T>&); // expected-note {{conflicting types for parameter 'T' ('int' vs. 'double')}}
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void argument_deduction() {
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static_assert(same_type<decltype(deduce({1, 2, 3})), int>::value, "bad deduction");
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static_assert(same_type<decltype(deduce({1.0, 2.0, 3.0})), double>::value, "bad deduction");
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deduce({1, 2.0}); // expected-error {{no matching function}}
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static_assert(same_type<decltype(deduce_ref({1, 2, 3})), int>::value, "bad deduction");
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static_assert(same_type<decltype(deduce_ref({1.0, 2.0, 3.0})), double>::value, "bad deduction");
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deduce_ref({1, 2.0}); // expected-error {{no matching function}}
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}
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void auto_deduction() {
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auto l = {1, 2, 3, 4};
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auto l2 {1, 2, 3, 4}; // expected-warning {{will change meaning in a future version of Clang}}
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static_assert(same_type<decltype(l), std::initializer_list<int>>::value, "");
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auto bl = {1, 2.0}; // expected-error {{cannot deduce}}
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for (int i : {1, 2, 3, 4}) {}
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}
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void dangle() {
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new auto{1, 2, 3}; // expected-error {{cannot use list-initialization}}
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new std::initializer_list<int>{1, 2, 3}; // expected-warning {{at the end of the full-expression}}
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}
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struct haslist1 {
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std::initializer_list<int> il = {1, 2, 3}; // expected-warning{{at the end of the constructor}}
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std::initializer_list<int> jl{1, 2, 3}; // expected-warning{{at the end of the constructor}}
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haslist1();
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};
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haslist1::haslist1()
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: il{1, 2, 3} // expected-warning{{at the end of the constructor}}
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{}
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namespace PR12119 {
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// Deduction with nested initializer lists.
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template<typename T> void f(std::initializer_list<T>);
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template<typename T> void g(std::initializer_list<std::initializer_list<T>>);
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void foo() {
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f({0, {1}}); // expected-warning{{braces around scalar initializer}}
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g({{0, 1}, {2, 3}});
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std::initializer_list<int> il = {1, 2};
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g({il, {2, 3}});
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}
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}
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namespace Decay {
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template<typename T>
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void f(std::initializer_list<T>) {
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T x = 1; // expected-error{{cannot initialize a variable of type 'const char *' with an rvalue of type 'int'}}
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}
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void g() {
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f({"A", "BB", "CCC"}); // expected-note{{in instantiation of function template specialization 'Decay::f<const char *>' requested here}}
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auto x = { "A", "BB", "CCC" };
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std::initializer_list<const char *> *il = &x;
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for( auto s : {"A", "BB", "CCC", "DDD"}) { }
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}
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}
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namespace PR12436 {
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struct X {
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template<typename T>
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X(std::initializer_list<int>, T);
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};
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X x({}, 17);
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}
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namespace rdar11948732 {
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template<typename T> struct X {};
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struct XCtorInit {
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XCtorInit(std::initializer_list<X<int>>);
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};
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void f(X<int> &xi) {
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XCtorInit xc = { xi, xi };
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}
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}
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namespace PR14272 {
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auto x { { 0, 0 } }; // expected-error {{cannot deduce actual type for variable 'x' with type 'auto' from initializer list}}
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}
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namespace initlist_of_array {
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void f(std::initializer_list<int[2]>) {}
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void f(std::initializer_list<int[2][2]>) = delete;
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void h() {
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f({{1,2},{3,4}});
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}
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}
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namespace init_list_deduction_failure {
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void f();
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void f(int);
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template<typename T> void g(std::initializer_list<T>);
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// expected-note@-1 {{candidate template ignored: couldn't resolve reference to overloaded function 'f'}}
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void h() { g({f}); }
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// expected-error@-1 {{no matching function for call to 'g'}}
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}
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namespace deleted_copy {
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struct X {
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X(int i) {}
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X(const X& x) = delete; // expected-note {{here}}
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void operator=(const X& x) = delete;
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};
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std::initializer_list<X> x{1}; // expected-error {{invokes deleted constructor}}
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}
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namespace RefVersusInitList {
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struct S {};
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void f(const S &) = delete;
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void f(std::initializer_list<S>);
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void g(S s) { f({S()}); }
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}
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namespace PR18013 {
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int f();
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std::initializer_list<long (*)()> x = {f}; // expected-error {{cannot initialize an array element of type 'long (*const)()' with an lvalue of type 'int ()': different return type ('long' vs 'int')}}
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}
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namespace DR1070 {
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struct S {
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S(std::initializer_list<int>);
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};
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S s[3] = { {1, 2, 3}, {4, 5} }; // ok
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S *p = new S[3] { {1, 2, 3}, {4, 5} }; // ok
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}
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namespace ListInitInstantiate {
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struct A {
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A(std::initializer_list<A>);
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A(std::initializer_list<int>);
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};
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struct B : A {
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B(int);
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};
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template<typename T> struct X {
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X();
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A a;
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};
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template<typename T> X<T>::X() : a{B{0}, B{1}} {}
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X<int> x;
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int f(const A&);
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template<typename T> void g() { int k = f({0}); }
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template void g<int>();
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}
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namespace TemporaryInitListSourceRange_PR22367 {
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struct A {
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constexpr A() {}
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A(std::initializer_list<int>); // expected-note {{here}}
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};
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constexpr int f(A) { return 0; }
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constexpr int k = f( // expected-error {{must be initialized by a constant expression}}
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// The point of this test is to check that the caret points to
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// 'std::initializer_list', not to '{0}'.
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std::initializer_list // expected-note {{constructor}}
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<int>
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{0}
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);
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}
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namespace ParameterPackNestedInitializerLists_PR23904c3 {
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template <typename ...T>
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void f(std::initializer_list<std::initializer_list<T>> ...tt);
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void foo() { f({{0}}, {{'\0'}}); }
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}
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