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// { dg-do run { target c++17 } }
// { dg-options "" }
#include <cassert>
// Check the semantics of a couple of operations to make sure
// that the expressions are formed correctly.
#define COMMA ,
#define MAKE_FNS(name, op) \
template<typename... Ts> \
auto unary_left_ ## name (Ts... ts) { return (... op ts); } \
template<typename... Ts> \
auto unary_right_ ## name (Ts... ts) { return (ts op ...); } \
template<typename T, typename... Ts> \
auto binary_left_ ## name (T x, Ts... ts) { return (x op ... op ts); } \
template<typename T, typename... Ts> \
auto binary_right_ ## name (T x, Ts... ts) { return (ts op ... op x); }
MAKE_FNS (add, +);
MAKE_FNS (sub, -);
int main() {
// assert(unary_left_add() == 0);
assert(unary_left_add(1) == 1);
assert(unary_left_add(1, 2, 3) == 6);
// assert(unary_right_add() == 0);
assert(unary_right_add(1) == 1);
assert(unary_right_add(1, 2, 3) == 6);
assert(binary_left_add(1) == 1);
assert(binary_left_add(1, 1) == 2);
assert(binary_left_add(1, 1, 2, 3) == 7);
assert(binary_right_add(1) == 1);
assert(binary_right_add(1, 1) == 2);
assert(binary_right_add(1, 1, 2, 3) == 7);
// unary_left_sub(); // { dg-error "empty"}
assert(unary_left_sub(1) == 1);
assert(unary_left_sub(1, 2, 3) == -4);
// unary_right_sub(); // { dg-error "empty"}
assert(unary_right_sub(1) == 1);
assert(unary_right_sub(1, 2, 3) == 2);
assert(binary_left_sub(1) == 1);
assert(binary_left_sub(1, 1) == 0);
assert(binary_left_sub(1, 1, 2, 3) == -5);
assert(binary_right_sub(1) == 1);
assert(binary_right_sub(1, 1) == 0);
assert(binary_right_sub(1, 1, 2, 3) == 1);
}
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