52 lines
1.3 KiB
C++
52 lines
1.3 KiB
C++
|
// RUN: %clang_cc1 -fsyntax-only -verify %s -Wno-unused-value -std=c++17
|
||
|
|
// expected-no-diagnostics
|
||
|
|
namespace test1 {
|
||
|
|
|
||
|
|
template <int num> int return_num() { return num; }
|
||
|
|
|
||
|
|
template <typename lambda> struct lambda_wrapper {
|
||
|
|
lambda &outer_lambda;
|
||
|
|
lambda_wrapper(lambda& outer_lambda) : outer_lambda(outer_lambda) {}
|
||
|
|
template <typename T> auto operator+(T t) { outer_lambda(t); return 1; }
|
||
|
|
};
|
||
|
|
|
||
|
|
template <int... nums, typename lambda>
|
||
|
|
void bw(lambda& outer_lambda) {
|
||
|
|
(lambda_wrapper(outer_lambda) + ... + return_num<nums>());
|
||
|
|
}
|
||
|
|
|
||
|
|
template <typename lambda> auto check_return_type(lambda inner_lambda) {
|
||
|
|
using inner_lambda_return_type = decltype(inner_lambda(5));
|
||
|
|
}
|
||
|
|
|
||
|
|
void cs() {
|
||
|
|
auto outer_lambda = [](auto param) {
|
||
|
|
auto inner_lambda = [](auto o) -> decltype(param) {};
|
||
|
|
check_return_type(inner_lambda);
|
||
|
|
};
|
||
|
|
bw<1,2>(outer_lambda);
|
||
|
|
}
|
||
|
|
|
||
|
|
} // namespace test1
|
||
|
|
|
||
|
|
namespace test2 {
|
||
|
|
|
||
|
|
template <typename lambda>
|
||
|
|
auto run_lambda_with_zero(lambda l) {
|
||
|
|
l(0);
|
||
|
|
}
|
||
|
|
template <typename ... Ts, typename lambda>
|
||
|
|
void run_lambda_once_per_type(lambda l) {
|
||
|
|
((Ts{}, run_lambda_with_zero(l)), ...);
|
||
|
|
}
|
||
|
|
template <typename> void inner_function() {
|
||
|
|
char c;
|
||
|
|
[](auto param) -> decltype(c) { return param; }(0);
|
||
|
|
}
|
||
|
|
void run() {
|
||
|
|
auto x = [](auto) -> void { inner_function<int>(); };
|
||
|
|
run_lambda_once_per_type<int>(x);
|
||
|
|
}
|
||
|
|
|
||
|
|
} // namespace test2
|