232 lines
6.8 KiB
C++
232 lines
6.8 KiB
C++
// RUN: %clang_cc1 -fsyntax-only -verify %s
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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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template<typename T, int N = 2> struct X; // expected-note{{template is declared here}}
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X<int, 1> *x1;
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X<int> *x2;
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X<> *x3; // expected-error{{too few template arguments for class template 'X'}}
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template<typename U = float, int M> struct X;
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X<> *x4;
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template<typename T = int> struct Z { };
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template struct Z<>;
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// PR4362
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template<class T> struct a { };
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template<> struct a<int> { static const bool v = true; };
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template<class T, bool = a<T>::v> struct p { }; // expected-error {{no member named 'v'}}
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template struct p<bool>; // expected-note {{in instantiation of default argument for 'p<bool>' required here}}
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template struct p<int>;
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// PR5187
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template<typename T, typename U>
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struct A;
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template<typename T, typename U = T>
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struct A;
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template<typename T, typename U>
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struct A {
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void f(A<T>);
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};
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template<typename T>
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struct B { };
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template<>
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struct B<void> {
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typedef B<void*> type;
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};
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// Nested default arguments for template parameters.
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template<typename T> struct X1 { };
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template<typename T>
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struct X2 {
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template<typename U = typename X1<T>::type> // expected-error{{no type named 'type' in 'X1<int>'}} \
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// expected-error{{no type named 'type' in 'X1<char>'}}
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struct Inner1 { }; // expected-note{{template is declared here}}
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template<T Value = X1<T>::value> // expected-error{{no member named 'value' in 'X1<int>'}} \
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// expected-error{{no member named 'value' in 'X1<char>'}}
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struct NonType1 { }; // expected-note{{template is declared here}}
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template<T Value>
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struct Inner2 { };
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template<typename U>
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struct Inner3 {
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template<typename X = T, typename V = U>
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struct VeryInner { };
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template<T Value1 = sizeof(T), T Value2 = sizeof(U),
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T Value3 = Value1 + Value2>
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struct NonType2 { };
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};
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};
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X2<int> x2i; // expected-note{{in instantiation of template class 'X2<int>' requested here}}
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X2<int>::Inner1<float> x2iif;
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X2<int>::Inner1<> x2bad; // expected-error{{too few template arguments for class template 'Inner1'}}
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X2<int>::NonType1<'a'> x2_nontype1;
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X2<int>::NonType1<> x2_nontype1_bad; // expected-error{{too few template arguments for class template 'NonType1'}}
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// Check multi-level substitution into template type arguments
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X2<int>::Inner3<float>::VeryInner<> vi;
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X2<char>::Inner3<int>::NonType2<> x2_deep_nontype; // expected-note{{in instantiation of template class 'X2<char>' requested here}}
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template<typename T, typename U>
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struct is_same { static const bool value = false; };
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template<typename T>
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struct is_same<T, T> { static const bool value = true; };
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int array1[is_same<__typeof__(vi),
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X2<int>::Inner3<float>::VeryInner<int, float> >::value? 1 : -1];
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int array2[is_same<__typeof(x2_deep_nontype),
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X2<char>::Inner3<int>::NonType2<sizeof(char), sizeof(int),
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sizeof(char)+sizeof(int)> >::value? 1 : -1];
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// Template template parameter defaults
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template<template<typename T> class X = X2> struct X3 { };
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int array3[is_same<X3<>, X3<X2> >::value? 1 : -1];
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struct add_pointer {
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template<typename T>
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struct apply {
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typedef T* type;
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};
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};
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template<typename T, template<typename> class X = T::template apply>
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struct X4;
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int array4[is_same<X4<add_pointer>,
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X4<add_pointer, add_pointer::apply> >::value? 1 : -1];
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template<int> struct X5 {}; // expected-note{{has a different type 'int'}}
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template<long> struct X5b {};
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template<typename T,
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template<T> class B = X5> // expected-error{{template template argument has different}} \
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// expected-note{{previous non-type template parameter}}
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struct X6 {};
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X6<int> x6a;
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X6<long> x6b; // expected-note{{while checking a default template argument}}
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X6<long, X5b> x6c;
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template<template<class> class X = B<int> > struct X7; // expected-error{{must be a class template}}
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namespace PR9643 {
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template<typename T> class allocator {};
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template<typename T, typename U = allocator<T> > class vector {};
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template<template<typename U, typename = allocator<U> > class container,
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typename DT>
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container<DT> initializer(const DT& d) {
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return container<DT>();
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}
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void f() {
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vector<int, allocator<int> > v = initializer<vector>(5);
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}
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}
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namespace PR16288 {
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template<typename X>
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struct S {
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template<typename T = int, typename U>
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#if __cplusplus <= 199711L // C++03 or earlier modes
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// expected-warning@-2 {{default template arguments for a function template are a C++11 extension}}
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#endif
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void f();
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};
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template<typename X>
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template<typename T, typename U>
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void S<X>::f() {}
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}
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namespace DR1635 {
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template <class T> struct X {
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template <class U = typename T::type> static void f(int) {} // expected-error {{type 'int' cannot be used prior to '::' because it has no members}}
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#if __cplusplus <= 199711L // C++03 or earlier modes
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// expected-warning@-2 {{default template arguments for a function template are a C++11 extension}}
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#endif
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static void f(...) {}
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};
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int g() { X<int>::f(0); } // expected-note {{in instantiation of template class 'DR1635::X<int>' requested here}}
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}
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namespace NondefDecls {
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template<typename T> void f1() {
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int g1(int defarg = T::error); // expected-error{{type 'int' cannot be used prior to '::' because it has no members}}
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}
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template void f1<int>(); // expected-note{{in instantiation of function template specialization 'NondefDecls::f1<int>' requested here}}
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}
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template <typename T>
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struct C {
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C(T t = ); // expected-error {{expected expression}}
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};
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C<int> obj;
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namespace PR26134 {
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// Make sure when substituting default template arguments we do it in the current context.
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template<class T, bool Val = T::value>
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struct X {};
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template<bool B> struct Y {
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void f() { X<Y> xy; }
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static const bool value = B;
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};
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namespace ns1 {
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template<class T0>
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struct X {
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template<bool B = T0::value> struct XInner { static const bool value = B; };
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};
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template<bool B> struct S { static const bool value = B; };
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#if __cplusplus > 199711L
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template<bool B> struct Y {
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static constexpr bool f() { return typename X<S<B>>::template XInner<>{}.value; }
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static_assert(f() == B, "");
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};
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Y<true> y;
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Y<false> y2;
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#endif
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} // end ns1
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} // end ns PR26134
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namespace friends {
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namespace ns {
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template<typename> struct A {
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template<typename> friend void f();
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template<typename> friend struct X;
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};
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template<typename = int> void f(); // expected-warning 0-1{{extension}}
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template<typename = int> struct X;
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A<int> a;
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}
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namespace ns {
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void g() { f(); }
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X<int> *p;
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}
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}
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namespace unevaluated {
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int a;
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template<int = 0> int f(int = a); // expected-warning 0-1{{extension}}
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int k = sizeof(f());
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}
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