1 // RUN: %clang_cc1 -fsyntax-only -verify -triple=x86_64-linux-gnu %s 2 3 // C++11 [temp.arg.nontype]p1: 4 // 5 // A template-argument for a non-type, non-template template-parameter shall 6 // be one of: 7 // -- an integral constant expression; or 8 // -- the name of a non-type template-parameter ; or 9 namespace non_type_tmpl_param { 10 template <int N> struct X0 { X0(); }; 11 template <int N> X0<N>::X0() { } 12 template <int* N> struct X1 { X1(); }; 13 template <int* N> X1<N>::X1() { } 14 template <int& N> struct X3 { X3(); }; 15 template <int& N> X3<N>::X3() { } 16 template <int (*F)(int)> struct X4 { X4(); }; 17 template <int (*F)(int)> X4<F>::X4() { } 18 template <typename T, int (T::* M)(int)> struct X5 { X5(); }; 19 template <typename T, int (T::* M)(int)> X5<T, M>::X5() { } 20 } 21 22 // -- a constant expression that designates the address of an object with 23 // static storage duration and external or internal linkage or a function 24 // with external or internal linkage, including function templates and 25 // function template-ids, but excluting non-static class members, expressed 26 // (ignoring parentheses) as & id-expression, except that the & may be 27 // omitted if the name refers to a function or array and shall be omitted 28 // if the corresopnding template-parameter is a reference; or 29 namespace addr_of_obj_or_func { 30 template <int* p> struct X0 { }; // expected-note 5{{here}} 31 template <int (*fp)(int)> struct X1 { }; 32 template <int &p> struct X2 { }; // expected-note 4{{here}} 33 template <const int &p> struct X2k { }; // expected-note {{here}} 34 template <int (&fp)(int)> struct X3 { }; // expected-note 4{{here}} 35 36 int i = 42; 37 int iarr[10]; 38 int f(int i); 39 const int ki = 9; // expected-note 5{{here}} 40 __thread int ti = 100; // expected-note 2{{here}} 41 static int f_internal(int); // expected-note 4{{here}} 42 template <typename T> T f_tmpl(T t); 43 struct S { union { int NonStaticMember; }; }; 44 45 void test() { 46 X0<i> x0a; // expected-error {{must have its address taken}} 47 X0<&i> x0a_addr; 48 X0<iarr> x0b; 49 X0<&iarr> x0b_addr; // expected-error {{cannot be converted to a value of type 'int *'}} 50 X0<ki> x0c; // expected-error {{must have its address taken}} expected-warning {{internal linkage is a C++11 extension}} 51 X0<&ki> x0c_addr; // expected-error {{cannot be converted to a value of type 'int *'}} expected-warning {{internal linkage is a C++11 extension}} 52 X0<&ti> x0d_addr; // expected-error {{refers to thread-local object}} 53 X1<f> x1a; 54 X1<&f> x1a_addr; 55 X1<f_tmpl> x1b; 56 X1<&f_tmpl> x1b_addr; 57 X1<f_tmpl<int> > x1c; 58 X1<&f_tmpl<int> > x1c_addr; 59 X1<f_internal> x1d; // expected-warning {{internal linkage is a C++11 extension}} 60 X1<&f_internal> x1d_addr; // expected-warning {{internal linkage is a C++11 extension}} 61 X2<i> x2a; 62 X2<&i> x2a_addr; // expected-error {{address taken}} 63 X2<iarr> x2b; // expected-error {{cannot bind to template argument of type 'int [10]'}} 64 X2<&iarr> x2b_addr; // expected-error {{address taken}} 65 X2<ki> x2c; // expected-error {{ignores qualifiers}} expected-warning {{internal linkage is a C++11 extension}} 66 X2k<ki> x2kc; // expected-warning {{internal linkage is a C++11 extension}} 67 X2k<&ki> x2kc_addr; // expected-error {{address taken}} expected-warning {{internal linkage is a C++11 extension}} 68 X2<ti> x2d_addr; // expected-error {{refers to thread-local object}} 69 X3<f> x3a; 70 X3<&f> x3a_addr; // expected-error {{address taken}} 71 X3<f_tmpl> x3b; 72 X3<&f_tmpl> x3b_addr; // expected-error {{address taken}} 73 X3<f_tmpl<int> > x3c; 74 X3<&f_tmpl<int> > x3c_addr; // expected-error {{address taken}} 75 X3<f_internal> x3d; // expected-warning {{internal linkage is a C++11 extension}} 76 X3<&f_internal> x3d_addr; // expected-error {{address taken}} expected-warning {{internal linkage is a C++11 extension}} 77 78 int n; // expected-note {{here}} 79 X0<&n> x0_no_linkage; // expected-error {{non-type template argument refers to object 'n' that does not have linkage}} 80 struct Local { static int f() {} }; // expected-note {{here}} 81 X1<&Local::f> x1_no_linkage; // expected-error {{non-type template argument refers to function 'f' that does not have linkage}} 82 X0<&S::NonStaticMember> x0_non_static; // expected-error {{non-static data member}} 83 } 84 } 85 86 // -- a constant expression that evaluates to a null pointer value (4.10); or 87 // -- a constant expression that evaluates to a null member pointer value 88 // (4.11); or 89 // -- a pointer to member expressed as described in 5.3.1. 90 91 namespace bad_args { 92 template <int* N> struct X0 { }; // expected-note 2{{template parameter is declared here}} 93 int i = 42; 94 X0<&i + 2> x0a; // expected-error{{non-type template argument does not refer to any declaration}} 95 int* iptr = &i; 96 X0<iptr> x0b; // expected-error{{non-type template argument for template parameter of pointer type 'int *' must have its address taken}} 97 } 98