| // Explicit generic lambda test from N3690 5.1.2.5 |
| // { dg-do compile { target c++14 } } |
| // { dg-options "-Wpedantic" } |
| |
| #include <iostream> |
| |
| int main() |
| { |
| 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 } } |
| bool b = glambda(3, 3.14); // OK |
| auto vglambda = [] <typename P> (P printer) { // { dg-warning "lambda templates are only available with" "" { target c++17_down } } |
| return [=] <typename... T> (T&& ... ts) { // OK: ts is a function parameter pack |
| printer(std::forward<decltype(ts)>(ts)...); // { dg-warning "lambda templates are only available with" "" { target c++17_down } .-1 } |
| return [=]() { |
| printer(ts ...); |
| }; |
| }; |
| }; |
| auto p = vglambda( [] <typename A, // { dg-warning "lambda templates are only available with" "" { target c++17_down } } |
| typename B, |
| typename C> (A v1, B v2, C v3) |
| { std::cout << v1 << v2 << v3; } ); |
| auto q = p(1, 'a', 3.14); // OK: outputs 1a3.14 |
| q(); // OK: outputs 1a3.14 |
| } |
| |