p3.cpp revision a5728872c7702ddd09537c95bc3cbd20e1f2fb09
1a5728872c7702ddd09537c95bc3cbd20e1f2fb09Daniel Dunbar// RUN: %clang_cc1 -fsyntax-only -verify %s 2500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor 3500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregortemplate<typename T> struct A { }; 4500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor 5500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor// Top-level cv-qualifiers of P's type are ignored for type deduction. 6500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregortemplate<typename T> A<T> f0(const T); 7500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor 8500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregorvoid test_f0(int i, const int ci) { 9500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor A<int> a0 = f0(i); 10500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor A<int> a1 = f0(ci); 11500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor} 12500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor 13500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor// If P is a reference type, the type referred to by P is used for type 14500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor// deduction. 15500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregortemplate<typename T> A<T> f1(T&); 16500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor 17500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregorvoid test_f1(int i, const int ci, volatile int vi) { 18500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor A<int> a0 = f1(i); 19500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor A<const int> a1 = f1(ci); 20500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor A<volatile int> a2 = f1(vi); 21500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor} 22500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor 23500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregortemplate<typename T, unsigned N> struct B { }; 24500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregortemplate<typename T, unsigned N> B<T, N> g0(T (&array)[N]); 25500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor 26500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregorvoid test_g0() { 27500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor int array0[5]; 28500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor B<int, 5> b0 = g0(array0); 29500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor const int array1[] = { 1, 2, 3}; 30500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor B<const int, 3> b1 = g0(array1); 31500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor} 32500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor 338a5cb1196ee8491570160e36c216631df3a9e95cDouglas Gregortemplate<typename T> B<T, 0> g1(const A<T>&); 348a5cb1196ee8491570160e36c216631df3a9e95cDouglas Gregor 358a5cb1196ee8491570160e36c216631df3a9e95cDouglas Gregorvoid test_g1(A<float> af) { 368a5cb1196ee8491570160e36c216631df3a9e95cDouglas Gregor B<float, 0> b0 = g1(af); 378a5cb1196ee8491570160e36c216631df3a9e95cDouglas Gregor B<int, 0> b1 = g1(A<int>()); 388a5cb1196ee8491570160e36c216631df3a9e95cDouglas Gregor} 398a5cb1196ee8491570160e36c216631df3a9e95cDouglas Gregor 40500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor// - If the original P is a reference type, the deduced A (i.e., the type 41500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor// referred to by the reference) can be more cv-qualified than the 42500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor// transformed A. 43500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregortemplate<typename T> A<T> f2(const T&); 44500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor 45500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregorvoid test_f2(int i, const int ci, volatile int vi) { 46500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor A<int> a0 = f2(i); 47500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor A<int> a1 = f2(ci); 48500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor A<volatile int> a2 = f2(vi); 49500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor} 50500d331eade2f5070b66ba51d777224f9fda6e1dDouglas Gregor 51508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor// - The transformed A can be another pointer or pointer to member type that 52508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor// can be converted to the deduced A via a qualification conversion (4.4). 53508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregortemplate<typename T> A<T> f3(T * * const * const); 54508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor 55508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregorvoid test_f3(int ***ip, volatile int ***vip) { 56508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor A<int> a0 = f3(ip); 57508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor A<volatile int> a1 = f3(vip); 58508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor} 59508f1c889b9833903ea394034fe0246d3a57a32dDouglas Gregor 60de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor// - If P is a class, and P has the form template-id, then A can be a 61de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor// derived class of the deduced A. Likewise, if P is a pointer to a class 62de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor// of the form template-id, A can be a pointer to a derived class pointed 63de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor// to by the deduced A. 64de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregortemplate<typename T, int I> struct C { }; 65de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor 66de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregorstruct D : public C<int, 1> { }; 67de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregorstruct E : public D { }; 68de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregorstruct F : A<float> { }; 694a5c15f75f76b95e1c2ceb6fa2737dcadd5f4be1Douglas Gregorstruct G : A<float>, C<int, 1> { }; 70de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor 71de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregortemplate<typename T, int I> 72de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor C<T, I> *f4a(const C<T, I>&); 73de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregortemplate<typename T, int I> 74de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor C<T, I> *f4b(C<T, I>); 75de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregortemplate<typename T, int I> 76de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor C<T, I> *f4c(C<T, I>*); 77de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregorint *f4c(...); 78de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor 794a5c15f75f76b95e1c2ceb6fa2737dcadd5f4be1Douglas Gregorvoid test_f4(D d, E e, F f, G g) { 80de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor C<int, 1> *ci1a = f4a(d); 81de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor C<int, 1> *ci2a = f4a(e); 82de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor C<int, 1> *ci1b = f4b(d); 83de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor C<int, 1> *ci2b = f4b(e); 84de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor C<int, 1> *ci1c = f4c(&d); 85de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor C<int, 1> *ci2c = f4c(&e); 864a5c15f75f76b95e1c2ceb6fa2737dcadd5f4be1Douglas Gregor C<int, 1> *ci3c = f4c(&g); 87de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor int *ip1 = f4c(&f); 88de0cb8b6c15c756e14b0716bebd40f4ce48ee717Douglas Gregor} 89