aoc24: day02b complete

sol/24/aoc.cpp

@@ -0,0 +1,34 @@
+#include <span>
+#include <expected>
+
+#include "aoc.hpp"
+#include "ctre.hpp"
+
+namespace aoc24 {
+auto entry([[maybe_unused]]std::span<char const*> const& args) -> std::expected<void, aoc::error> {
+    using namespace aoc::types;
+
+    u32 day = 1;
+    if (args.size() > 1) {
+        if (ctre::match<"^[0-9]+$">(args[1]))
+            day = std::stoul(args[1]);
+        else
+            fmt::print(stderr, "arg: {} is not a number\n", args[1]);
+    }
+
+    switch (day) {
+    case 1: return day01(args);
+    case 2: return day02(args);
+    case 3: return day03(args);
+    case 4: return day04(args);
+    case 5: return day05(args);
+    case 6: return day06(args);
+    case 7: return day07(args);
+    case 8: return day08(args);
+    default:
+        return aoc::make_error(fmt::format("day {}", day), std::errc::not_supported);
+    }
+
+    return {};
+}
+}