1 // Explicit generic lambda test from N3690 5.1.2.5 2 // { dg-do compile { target c++14 } } 3 // { dg-options "-Wpedantic" } 4 5 #include <iostream> 6 main()7int main() 8 { 9 auto glambda = [] <typename A, typename B> (A a, B&& b) { return a < b; }; // { dg-warning "lambda templates are only available with" "" { target c++17_down } } 10 bool b = glambda(3, 3.14); // OK 11 auto vglambda = [] <typename P> (P printer) { // { dg-warning "lambda templates are only available with" "" { target c++17_down } } 12 return [=] <typename... T> (T&& ... ts) { // OK: ts is a function parameter pack 13 printer(std::forward<decltype(ts)>(ts)...); // { dg-warning "lambda templates are only available with" "" { target c++17_down } .-1 } 14 return [=]() { 15 printer(ts ...); 16 }; 17 }; 18 }; 19 auto p = vglambda( [] <typename A, // { dg-warning "lambda templates are only available with" "" { target c++17_down } } 20 typename B, 21 typename C> (A v1, B v2, C v3) 22 { std::cout << v1 << v2 << v3; } ); 23 auto q = p(1, 'a', 3.14); // OK: outputs 1a3.14 24 q(); // OK: outputs 1a3.14 25 } 26 27