d69f4f5b05
It's actually meaningful and useful to allow such variables to have no initializer, but we are strictly following the standard here until the C++ committee reaches consensus on allowing this. llvm-svn: 294785
197 lines
9.7 KiB
C++
197 lines
9.7 KiB
C++
// RUN: %clang_cc1 -std=c++1z -fcxx-exceptions -verify %s
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template <typename T> struct A { // expected-note 35{{declared here}}
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constexpr A() {}
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constexpr A(int) {}
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constexpr operator int() { return 0; }
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};
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A() -> A<int>;
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A(int) -> A<int>;
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// Make sure we still correctly parse cases where a template can appear without arguments.
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namespace template_template_arg {
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template<template<typename> typename> struct X {};
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template<typename> struct Y {};
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X<A> xa;
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Y<A> ya; // expected-error {{requires template arguments}}
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X<::A> xcca;
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Y<::A> ycca; // expected-error {{requires template arguments}}
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template<template<typename> typename = A> struct XD {};
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template<typename = A> struct YD {}; // expected-error {{requires template arguments}}
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template<template<typename> typename = ::A> struct XCCD {};
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template<typename = ::A> struct YCCD {}; // expected-error {{requires template arguments}}
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// FIXME: replacing the invalid type with 'int' here is horrible
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template <A a = A<int>()> class C { }; // expected-error {{requires template arguments}}
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template<typename T = A> struct G { }; // expected-error {{requires template arguments}}
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}
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namespace injected_class_name {
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template<typename T> struct A {
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A(T);
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void f(int) {
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A a = 1;
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injected_class_name::A b = 1; // expected-error {{no viable constructor or deduction guide}}
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}
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void f(T);
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};
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A<short> ai = 1;
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A<double>::A b(1); // expected-error {{constructor name}}
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}
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struct member {
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A a; // expected-error {{requires template arguments}}
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A *b; // expected-error {{requires template arguments}}
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const A c; // expected-error {{requires template arguments}}
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void f() throw (A); // expected-error {{requires template arguments}}
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friend A; // expected-error {{requires template arguments; argument deduction not allowed in friend declaration}}
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operator A(); // expected-error {{requires template arguments; argument deduction not allowed in conversion function type}}
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static A x; // expected-error {{declaration of variable 'x' with deduced type 'A' requires an initializer}}
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static constexpr A y = 0;
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};
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namespace in_typedef {
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typedef A *AutoPtr; // expected-error {{requires template arguments; argument deduction not allowed in typedef}}
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typedef A (*PFun)(int a); // expected-error{{requires template arguments; argument deduction not allowed in typedef}}
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typedef A Fun(int a) -> decltype(a + a); // expected-error{{requires template arguments; argument deduction not allowed in function return type}}
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}
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namespace stmt {
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void g(A a) { // expected-error{{requires template arguments; argument deduction not allowed in function prototype}}
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try { }
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catch (A &a) { } // expected-error{{requires template arguments; argument deduction not allowed in exception declaration}}
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catch (const A a) { } // expected-error{{requires template arguments; argument deduction not allowed in exception declaration}}
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try { } catch (A a) { } // expected-error{{requires template arguments; argument deduction not allowed in exception declaration}}
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// FIXME: The standard only permits class template argument deduction in a
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// simple-declaration or cast. We also permit it in conditions,
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// for-range-declarations, member-declarations for static data members, and
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// new-expressions, because not doing so would be bizarre.
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A local = 0;
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static A local_static = 0;
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static thread_local A thread_local_static = 0;
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if (A a = 0) {}
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if (A a = 0; a) {}
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switch (A a = 0) {} // expected-warning {{no case matching constant switch condition '0'}}
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switch (A a = 0; a) {} // expected-warning {{no case matching constant switch condition '0'}}
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for (A a = 0; a; /**/) {}
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for (/**/; A a = 0; /**/) {}
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while (A a = 0) {}
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int arr[3];
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for (A a : arr) {}
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}
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namespace std {
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class type_info;
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}
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}
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namespace expr {
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template<typename T> struct U {};
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void j() {
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(void)typeid(A); // expected-error{{requires template arguments; argument deduction not allowed here}}
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(void)sizeof(A); // expected-error{{requires template arguments; argument deduction not allowed here}}
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(void)__alignof(A); // expected-error{{requires template arguments; argument deduction not allowed here}}
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U<A> v; // expected-error {{requires template arguments}}
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int n;
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(void)dynamic_cast<A&>(n); // expected-error{{requires template arguments; argument deduction not allowed here}}
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(void)static_cast<A*>(&n); // expected-error{{requires template arguments; argument deduction not allowed here}}
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(void)reinterpret_cast<A*>(&n); // expected-error{{requires template arguments; argument deduction not allowed here}}
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(void)const_cast<A>(n); // expected-error{{requires template arguments; argument deduction not allowed here}}
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(void)*(A*)(&n); // expected-error{{requires template arguments; argument deduction not allowed here}}
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(void)(A)(n); // expected-error{{requires template arguments; argument deduction not allowed here}}
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(void)(A){n}; // expected-error{{requires template arguments; argument deduction not allowed here}}
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(void)A(n);
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(void)A{n};
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(void)new A(n);
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(void)new A{n};
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// FIXME: We should diagnose the lack of an initializer here.
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(void)new A;
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}
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}
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namespace decl {
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enum E : A {}; // expected-error{{requires template arguments; argument deduction not allowed here}}
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struct F : A {}; // expected-error{{expected class name}}
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using B = A; // expected-error{{requires template arguments}}
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auto k() -> A; // expected-error{{requires template arguments}}
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A a; // expected-error {{declaration of variable 'a' with deduced type 'A' requires an initializer}}
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A b = 0;
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const A c = 0;
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A (parens) = 0; // expected-error {{cannot use parentheses when declaring variable with deduced class template specialization type}}
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A *p = 0; // expected-error {{cannot form pointer to deduced class template specialization type}}
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A &r = *p; // expected-error {{cannot form reference to deduced class template specialization type}}
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A arr[3] = 0; // expected-error {{cannot form array of deduced class template specialization type}}
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A F::*pm = 0; // expected-error {{cannot form pointer to deduced class template specialization type}}
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A (*fp)() = 0; // expected-error {{cannot form function returning deduced class template specialization type}}
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A [x, y] = 0; // expected-error {{cannot be declared with type 'A'}} expected-error {{type 'A<int>' decomposes into 0 elements, but 2 names were provided}}
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}
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namespace typename_specifier {
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struct F {};
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void e() {
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(void) typename ::A(0);
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(void) typename ::A{0};
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new typename ::A(0);
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new typename ::A{0};
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typename ::A a = 0;
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const typename ::A b = 0;
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if (typename ::A a = 0) {}
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for (typename ::A a = 0; typename ::A b = 0; /**/) {}
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(void)(typename ::A)(0); // expected-error{{requires template arguments; argument deduction not allowed here}}
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(void)(typename ::A){0}; // expected-error{{requires template arguments; argument deduction not allowed here}}
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}
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typename ::A a = 0;
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const typename ::A b = 0;
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typename ::A (parens) = 0; // expected-error {{cannot use parentheses when declaring variable with deduced class template specialization type}}
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typename ::A *p = 0; // expected-error {{cannot form pointer to deduced class template specialization type}}
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typename ::A &r = *p; // expected-error {{cannot form reference to deduced class template specialization type}}
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typename ::A arr[3] = 0; // expected-error {{cannot form array of deduced class template specialization type}}
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typename ::A F::*pm = 0; // expected-error {{cannot form pointer to deduced class template specialization type}}
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typename ::A (*fp)() = 0; // expected-error {{cannot form function returning deduced class template specialization type}}
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typename ::A [x, y] = 0; // expected-error {{cannot be declared with type 'typename ::A'}} expected-error {{type 'typename ::A<int>' (aka 'A<int>') decomposes into 0}}
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struct X { template<typename T> struct A {}; }; // expected-note 8{{template}}
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// FIXME: We do not yet properly support class template argument deduction
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// during template instantiation.
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template<typename T> void f() {
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(void) typename T::A(0); // expected-error {{no viable}}
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(void) typename T::A{0}; // expected-error {{no viable}}
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new typename T::A(0); // expected-error {{no viable}}
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new typename T::A{0}; // expected-error {{no viable}}
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typename T::A a = 0; // expected-error {{no viable}}
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const typename T::A b = 0; // expected-error {{no viable}}
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if (typename T::A a = 0) {} // expected-error {{no viable}}
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for (typename T::A a = 0; typename T::A b = 0; /**/) {} // expected-error 2{{no viable}}
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{(void)(typename T::A)(0);} // expected-error{{refers to class template member}}
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{(void)(typename T::A){0};} // expected-error{{refers to class template member}}
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{typename T::A (parens) = 0;} // expected-error {{refers to class template member in 'typename_specifier::X'; argument deduction not allowed here}}
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{typename T::A *p = 0;} // expected-error {{refers to class template member}}
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{typename T::A &r = *p;} // expected-error {{refers to class template member}}
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{typename T::A arr[3] = 0;} // expected-error {{refers to class template member}}
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{typename T::A F::*pm = 0;} // expected-error {{refers to class template member}}
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{typename T::A (*fp)() = 0;} // expected-error {{refers to class template member}}
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{typename T::A [x, y] = 0;} // expected-error {{cannot be declared with type 'typename T::A'}} expected-error {{no viable}}
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}
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template void f<X>(); // expected-note {{instantiation of}}
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template<typename T> void g(typename T::A = 0); // expected-note {{refers to class template member}}
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void h() { g<X>(); } // expected-error {{no matching function}}
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}
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