55462626b6
before the template parameters have acquired a proper context (e.g., because the enclosing context has yet to be built), provide empty parameter lists for all outer template parameter scopes to inhibit any substitution for those template parameters. Fixes PR9643 / <rdar://problem/9251019>. llvm-svn: 133055
139 lines
3.8 KiB
C++
139 lines
3.8 KiB
C++
// RUN: %clang_cc1 -fsyntax-only -verify %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}}
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struct Inner1 { };
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template<T Value = X1<T>::value> // expected-error{{no member named 'value'}}
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struct NonType1 { };
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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;
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X2<int>::Inner1<float> x2iif;
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X2<int>::Inner1<> x2bad; // expected-note{{instantiation of default argument}}
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X2<int>::NonType1<'a'> x2_nontype1;
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X2<int>::NonType1<> x2_nontype1_bad; // expected-note{{instantiation of default argument}}
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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;
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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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