1 // RUN: %clang_cc1 -fsyntax-only -verify %s -std=c++1y -DCXX1Y 2 3 namespace test_factorial { 4 5 auto Fact = [](auto Self, unsigned n) -> unsigned { 6 return !n ? 1 : Self(Self, n - 1) * n; 7 }; 8 9 auto six = Fact(Fact, 3); 10 11 } 12 13 namespace overload_generic_lambda { 14 template <class F1, class F2> struct overload : F1, F2 { 15 using F1::operator(); 16 using F2::operator(); 17 overload(F1 f1, F2 f2) : F1(f1), F2(f2) { } 18 }; 19 20 auto NumParams = [](auto Self, auto h, auto ... rest) -> unsigned { 21 return 1 + Self(Self, rest...); 22 }; 23 auto Base = [](auto Self, auto h) -> unsigned { 24 return 1; 25 }; 26 overload<decltype(Base), decltype(NumParams)> O(Base, NumParams); 27 int num_params = O(O, 5, 3, "abc", 3.14, 'a'); 28 } 29 30 31 namespace overload_generic_lambda_return_type_deduction { 32 template <class F1, class F2> struct overload : F1, F2 { 33 using F1::operator(); 34 using F2::operator(); 35 overload(F1 f1, F2 f2) : F1(f1), F2(f2) { } 36 }; 37 38 auto NumParams = [](auto Self, auto h, auto ... rest) { 39 return 1 + Self(Self, rest...); 40 }; 41 auto Base = [](auto Self, auto h) { 42 return 1; 43 }; 44 overload<decltype(Base), decltype(NumParams)> O(Base, NumParams); 45 int num_params = O(O, 5, 3, "abc", 3.14, 'a'); 46 } 47 48 namespace test_standard_p5 { 49 // FIXME: This test should eventually compile without an explicit trailing return type 50 auto glambda = [](auto a, auto&& b) ->bool { return a < b; }; 51 bool b = glambda(3, 3.14); // OK 52 53 } 54 namespace test_deduction_failure { 55 int test() { 56 auto g = [](auto *a) { //expected-note{{candidate template ignored}} 57 return a; 58 }; 59 struct X { }; 60 X *x; 61 g(x); 62 g(3); //expected-error{{no matching function}} 63 return 0; 64 } 65 66 } 67 68 namespace test_instantiation_or_sfinae_failure { 69 int test2() { 70 { 71 auto L = [](auto *a) { 72 return (*a)(a); }; //expected-error{{called object type 'double' is not a function}} 73 double d; 74 L(&d); //expected-note{{in instantiation of}} 75 auto M = [](auto b) { return b; }; 76 L(&M); // ok 77 } 78 { 79 auto L = [](auto *a) ->decltype (a->foo()) { //expected-note2{{candidate template ignored:}} 80 return (*a)(a); }; 81 double d; 82 L(&d); //expected-error{{no matching function for call}} 83 auto M = [](auto b) { return b; }; 84 L(&M); //expected-error{{no matching function for call}} 85 86 } 87 return 0; 88 } 89 90 91 } 92 93 namespace test_misc { 94 auto GL = [](auto a, decltype(a) b) //expected-note{{candidate function}} 95 -> int { return a + b; }; 96 97 void test() { 98 struct X { }; 99 GL(3, X{}); //expected-error{{no matching function}} 100 } 101 102 void test2() { 103 auto l = [](auto *a) -> int { 104 (*a)(a); return 0; }; //expected-error{{called object type 'double' is not a function}} 105 l(&l); 106 double d; 107 l(&d); //expected-note{{in instantiation of}} 108 } 109 110 } 111 112 namespace nested_lambdas { 113 int test() { 114 auto L = [](auto a) { 115 return [=](auto b) { 116 return a + b; 117 }; 118 }; 119 } 120 auto get_lambda() { 121 return [](auto a) { 122 return a; 123 }; 124 }; 125 126 int test2() { 127 auto L = get_lambda(); 128 L(3); 129 } 130 } 131 132
