Error handling not relying on exceptions

Author: Saalvage

relaxed_concurrent_fifo/benchmark.h

@@ -291,6 +291,7 @@ struct benchmark_bfs : benchmark_timed<> {
 		long long pushed_nodes{ 0 };
 		long long ignored_nodes{ 0 };
 		long long processed_nodes{ 0 };
+		bool err{ false };
 	};
 
 #ifdef __GNUC__
@@ -331,7 +332,7 @@ struct benchmark_bfs : benchmark_timed<> {
 			while (d < old_d) {
 				if (distances[target].value.compare_exchange_weak(old_d, d, std::memory_order_relaxed)) {
 					if (!handle.push((static_cast<std::uint64_t>(d) << 32) | target)) {
-						throw std::runtime_error("Push failed!");
+						counter.err = true;
 					}
 					++counter.pushed_nodes;
 					break;
@@ -368,9 +369,15 @@ struct benchmark_bfs : benchmark_timed<> {
 			sum.pushed_nodes += counter.pushed_nodes;
 			sum.processed_nodes += counter.processed_nodes;
 			sum.ignored_nodes += counter.ignored_nodes;
+			sum.err |= counter.err;
 			return sum;
 		});
 
+		if (total_counts.err) {
+			stream << "ERR";
+			return;
+		}
+
 		auto longest_distance =
         std::max_element(distances.begin(), distances.end(), [](auto const& a, auto const& b) {
             auto a_val = a.value.load(std::memory_order_relaxed);