Viewing file:  lambda-generic-x.C (1.12 KB) -rw-r--r--
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// 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
}
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