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// RUN: %check_clang_tidy -std=c++17-or-later %s fuchsia-trailing-return %t
int add_one(const int arg) { return arg; }
auto get_add_one() -> int (*)(const int) {
// CHECK-MESSAGES: [[@LINE-1]]:1: warning: a trailing return type is disallowed for this function declaration
// CHECK-NEXT: auto get_add_one() -> int (*)(const int) {
return add_one;
}
auto lambda = [](double x, double y) {return x + y;};
auto lambda2 = [](double x, double y) -> double {return x + y;};
int main() {
get_add_one()(5);
return 0;
}
template <typename T1, typename T2>
auto fn(const T1 &lhs, const T2 &rhs) -> decltype(lhs + rhs) {
return lhs + rhs;
}
// Now check that implicit and explicit C++17 deduction guides don't trigger this warning (PR#47614).
template <typename T>
struct ImplicitDeductionGuides {
ImplicitDeductionGuides(const T &);
};
template <typename A, typename B>
struct pair {
A first;
B second;
};
template <typename T>
struct UserDefinedDeductionGuides {
UserDefinedDeductionGuides(T);
template <typename T1, typename T2>
UserDefinedDeductionGuides(T1, T2);
};
template <typename T1, typename T2>
UserDefinedDeductionGuides(T1, T2) -> UserDefinedDeductionGuides<pair<T1, T2>>;
void foo() {
ImplicitDeductionGuides X(42);
UserDefinedDeductionGuides s(1, "abc");
}
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