forked from OSchip/llvm-project
209 lines
6.5 KiB
C++
209 lines
6.5 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, typename U = int> struct A; // expected-note {{template is declared here}} \
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// expected-note{{explicitly specialized}}
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template<> struct A<double, double>; // expected-note{{forward declaration}}
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template<> struct A<float, float> { // expected-note{{previous definition}}
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int x;
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};
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template<> struct A<float> { // expected-note{{previous definition}}
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int y;
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};
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int test_specs(A<float, float> *a1, A<float, int> *a2) {
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return a1->x + a2->y;
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}
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int test_incomplete_specs(A<double, double> *a1,
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A<double> *a2)
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{
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(void)a1->x; // expected-error{{member access into incomplete type}}
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(void)a2->x; // expected-error{{implicit instantiation of undefined template 'A<double, int>'}}
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}
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typedef float FLOAT;
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template<> struct A<float, FLOAT>;
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template<> struct A<FLOAT, float> { }; // expected-error{{redefinition}}
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template<> struct A<float, int> { }; // expected-error{{redefinition}}
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template<typename T, typename U = int> struct X;
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template <> struct X<int, int> { int foo(); }; // #1
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template <> struct X<float> { int bar(); }; // #2
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typedef int int_type;
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void testme(X<int_type> *x1, X<float, int> *x2) {
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(void)x1->foo(); // okay: refers to #1
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(void)x2->bar(); // okay: refers to #2
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}
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// Make sure specializations are proper classes.
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template<>
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struct A<char> {
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A();
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};
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A<char>::A() { }
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// Make sure we can see specializations defined before the primary template.
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namespace N{
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template<typename T> struct A0;
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}
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namespace N {
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template<>
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struct A0<void> {
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typedef void* pointer;
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};
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}
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namespace N {
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template<typename T>
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struct A0 {
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void foo(A0<void>::pointer p = 0);
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};
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}
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// Diagnose specialization errors
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struct A<double> { }; // expected-error{{template specialization requires 'template<>'}}
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template<> struct ::A<double>;
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namespace N {
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template<typename T> struct B; // expected-note {{explicitly specialized}}
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#if __cplusplus <= 199711L
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// expected-note@-2 {{explicitly specialized}}
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#endif
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template<> struct ::N::B<char>; // okay
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template<> struct ::N::B<short>; // okay
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template<> struct ::N::B<int>; // okay
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int f(int);
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}
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template<> struct N::B<int> { }; // okay
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template<> struct N::B<float> { };
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#if __cplusplus <= 199711L
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// expected-warning@-2 {{first declaration of class template specialization of 'B' outside namespace 'N' is a C++11 extension}}
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#endif
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namespace M {
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template<> struct ::N::B<short> { }; // expected-error{{class template specialization of 'B' not in a namespace enclosing 'N'}}
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template<> struct ::A<long double>; // expected-error{{must occur at global scope}}
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}
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template<> struct N::B<char> {
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int testf(int x) { return f(x); }
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};
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// PR5264
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template <typename T> class Foo;
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Foo<int>* v;
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Foo<int>& F() { return *v; }
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template <typename T> class Foo {};
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Foo<int> x;
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// Template template parameters
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template<template<class T> class Wibble>
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class Wibble<int> { }; // expected-error{{cannot specialize a template template parameter}}
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namespace rdar9676205 {
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template<typename T>
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struct X {
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template<typename U>
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struct X<U*> { // expected-error{{explicit specialization of 'X' in class scope}}
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};
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};
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}
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namespace PR18009 {
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template <typename T> struct A {
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template <int N, int M> struct S;
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template <int N> struct S<N, sizeof(T)> {};
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};
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A<int>::S<8, sizeof(int)> a; // ok
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template <typename T> struct B {
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template <int N, int M> struct S; // expected-note {{declared here}}
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template <int N> struct S<N, sizeof(T) +
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N // expected-error {{non-type template argument depends on a template parameter of the partial specialization}}
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> {};
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};
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B<int>::S<8, sizeof(int) + 8> s; // expected-error {{undefined}}
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template<int A> struct outer {
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template<int B, int C> struct inner {};
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template<int C> struct inner<A * 2, C> {};
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};
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}
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namespace PR16519 {
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template<typename T, T...N> struct integer_sequence { typedef T value_type; };
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#if __cplusplus <= 199711L
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// expected-warning@-2 {{variadic templates are a C++11 extension}}
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#endif
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template<typename T> struct __make_integer_sequence;
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template<typename T, T N> using make_integer_sequence = typename __make_integer_sequence<T>::template make<N, N % 2>::type;
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#if __cplusplus <= 199711L
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// expected-warning@-2 {{alias declarations are a C++11 extension}}
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#endif
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template<typename T, typename T::value_type ...Extra> struct __make_integer_sequence_impl;
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#if __cplusplus <= 199711L
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// expected-warning@-2 {{variadic templates are a C++11 extension}}
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#endif
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template<typename T, T ...N, T ...Extra> struct __make_integer_sequence_impl<integer_sequence<T, N...>, Extra...> {
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#if __cplusplus <= 199711L
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// expected-warning@-2 2 {{variadic templates are a C++11 extension}}
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#endif
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typedef integer_sequence<T, N..., sizeof...(N) + N..., Extra...> type;
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};
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template<typename T> struct __make_integer_sequence {
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template<T N, T Parity, typename = void> struct make;
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template<typename Dummy> struct make<0, 0, Dummy> { typedef integer_sequence<T> type; };
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template<typename Dummy> struct make<1, 1, Dummy> { typedef integer_sequence<T, 0> type; };
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template<T N, typename Dummy> struct make<N, 0, Dummy> : __make_integer_sequence_impl<make_integer_sequence<T, N/2> > {};
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template<T N, typename Dummy> struct make<N, 1, Dummy> : __make_integer_sequence_impl<make_integer_sequence<T, N/2>, N - 1> {};
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};
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using X = make_integer_sequence<int, 5>;
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#if __cplusplus <= 199711L
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// expected-warning@-2 {{alias declarations are a C++11 extension}}
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#endif
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using X = integer_sequence<int, 0, 1, 2, 3, 4>;
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#if __cplusplus <= 199711L
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// expected-warning@-2 {{alias declarations are a C++11 extension}}
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#endif
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}
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namespace DefaultArgVsPartialSpec {
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// Check that the diagnostic points at the partial specialization, not just at
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// the default argument.
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template<typename T, int N =
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sizeof(T) // expected-note {{template parameter is used in default argument declared here}}
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> struct X {};
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template<typename T> struct X<T> {}; // expected-error {{non-type template argument depends on a template parameter of the partial specialization}}
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template<typename T,
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T N = 0 // expected-note {{template parameter is declared here}}
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> struct S;
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template<typename T> struct S<T> {}; // expected-error {{non-type template argument specializes a template parameter with dependent type 'T'}}
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}
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