From a1ef62cd44e5b5a54d92d7ccf559b14874e7c8f8 Mon Sep 17 00:00:00 2001
From: Bert Peters <bert@bertptrs.nl>
Date: Mon, 9 Dec 2019 18:33:34 +0100
Subject: [PATCH] Reuse IntCodeComputer for part 1.

---
 2019/src/day07.cpp | 20 +++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

diff --git a/2019/src/day07.cpp b/2019/src/day07.cpp
index b638c0d..cc57b1e 100644
--- a/2019/src/day07.cpp
+++ b/2019/src/day07.cpp
@@ -7,12 +7,14 @@
 namespace {
     using aoc2019::IntCodeComputer;
 
-    int simulate(const std::vector<int> &program, const std::array<int, 5> &phases) {
-        int state = 0;
-        for (int phase : phases) {
-            auto copy = program;
-            auto result = aoc2019::run_intcode(copy, {phase, state});
-            state = result.front();
+    std::int64_t simulate(const std::vector<std::int64_t> &program, const std::array<std::int64_t, 5> &phases) {
+        std::int64_t state = 0;
+        for (auto phase : phases) {
+            std::deque<std::int64_t> outputs;
+            IntCodeComputer computer{program, {phase, state}};
+            computer.connectOutput(outputs);
+            computer.run();
+            state = outputs.front();
         }
 
         return state;
@@ -41,10 +43,10 @@ namespace {
 }
 
 void aoc2019::day07_part1(std::istream &input, std::ostream &output) {
-    const auto program = aoc2019::read_intcode(input);
-    std::array<int, 5> phases{0, 1, 2, 3, 4};
+    const auto program = aoc2019::IntCodeComputer::read_intcode(input);
+    std::array<std::int64_t, 5> phases{0, 1, 2, 3, 4};
 
-    int best = 0;
+    std::int64_t best = 0;
 
     do {
         best = std::max(simulate(program, phases), best);