added initial cpp version

day01cpp/.envrc

+use flake

day01cpp/CMakeLists.txt

+cmake_minimum_required(VERSION 3.0)
+
+set(CMAKE_CXX_STANDARD 20)
+
+project(day01 LANGUAGES CXX VERSION 1.0.0)
+
+add_executable(main
+    ${PROJECT_SOURCE_DIR}/main.cpp
+)
\ No newline at end of file

day01cpp/flake.lock

+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1701268161,
+        "narHash": "sha256-hL4jGGwMHHmyx6G9wi6IrYa8RLkoEtzCb4zWITH1B40=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "67be70a859530f6f7c358568eaa6ab0d84b36b01",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-23.05",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs",
+        "utils": "utils"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    },
+    "utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1694529238,
+        "narHash": "sha256-zsNZZGTGnMOf9YpHKJqMSsa0dXbfmxeoJ7xHlrt+xmY=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "ff7b65b44d01cf9ba6a71320833626af21126384",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

day01cpp/flake.nix

+{
+  description = "AoC 2023 - day 01 cpp";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-23.05";
+    utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, utils, ... }:
+    utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = import nixpkgs {
+          inherit system;
+        };
+        buildInputs = with pkgs; [
+          ninja
+          cmake
+        ];
+      in
+      {
+        defaultPackage = pkgs.stdenv.mkDerivation {
+          name = "main";
+          inherit buildInputs;
+          src = ./.;
+          installPhase = ''
+            runHook preInstall
+            mkdir -p $out/bin
+            cp ./main $out/bin/
+            runHook postInstall
+          '';
+        };
+        devShell = with pkgs; mkShell {
+          buildInputs = buildInputs ++ [ clang-tools lldb ];
+        };
+      }
+    );
+}

day01cpp/main.cpp

+int main() {}

day01cpp/result

+/nix/store/jq765ilimf52jh2jbllj7l67b1cq00gv-main
\ No newline at end of file

flake.lock

@@ -10,12 +10,30 @@
       },
       "locked": {
         "lastModified": 1,
-        "narHash": "sha256-Skcd0y3BZ27ycrNGxmHcMyGRPat8mYU0IXM1Lc/174I=",
-        "path": "/nix/store/lylqmpv4yipaapna82jpnmsxd7r4m82q-source/day01",
+        "narHash": "sha256-tY3L0BwQAOShopkV4HZ+v9zwM16Yj+joLr+5xi6Bwx8=",
+        "path": "/nix/store/wl49h89zff154wpqbagplgk7sw1z74ds-source/day01",
         "type": "path"
       },
       "original": {
-        "path": "/nix/store/lylqmpv4yipaapna82jpnmsxd7r4m82q-source/day01",
+        "path": "/nix/store/wl49h89zff154wpqbagplgk7sw1z74ds-source/day01",
+        "type": "path"
+      }
+    },
+    "day01cpp": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "utils": "utils_2"
+      },
+      "locked": {
+        "lastModified": 1,
+        "narHash": "sha256-gwH89EDWFx3eparAlrWPU/9GnsltYgNk0Kia2ZwycgI=",
+        "path": "/nix/store/wl49h89zff154wpqbagplgk7sw1z74ds-source/day01cpp",
+        "type": "path"
+      },
+      "original": {
+        "path": "/nix/store/wl49h89zff154wpqbagplgk7sw1z74ds-source/day01cpp",
         "type": "path"
       }
     },
@@ -81,9 +99,10 @@
     "root": {
       "inputs": {
         "day01": "day01",
+        "day01cpp": "day01cpp",
         "naersk": "naersk_2",
         "nixpkgs": "nixpkgs",
-        "utils": "utils_2"
+        "utils": "utils_3"
       }
     },
     "systems": {
@@ -116,6 +135,21 @@
         "type": "github"
       }
     },
+    "systems_3": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    },
     "utils": {
       "inputs": {
         "systems": "systems"
@@ -151,6 +185,24 @@
         "repo": "flake-utils",
         "type": "github"
       }
+    },
+    "utils_3": {
+      "inputs": {
+        "systems": "systems_3"
+      },
+      "locked": {
+        "lastModified": 1694529238,
+        "narHash": "sha256-zsNZZGTGnMOf9YpHKJqMSsa0dXbfmxeoJ7xHlrt+xmY=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "ff7b65b44d01cf9ba6a71320833626af21126384",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
     }
   },
   "root": "root",

flake.nix

@@ -7,6 +7,10 @@
       url = "./day01";
       inputs.nixpkgs.follows = "nixpkgs";
     };
+    day01cpp = {
+      url = "./day01cpp";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
     naersk = {
       url = "github:nix-community/naersk/master";
       inputs.nixpkgs.follows = "nixpkgs";
@@ -14,12 +18,16 @@
     utils.url = "github:numtide/flake-utils";
   };
 
-  outputs = { self, nixpkgs, utils, naersk, day01 }:
+  outputs = { self, nixpkgs, utils, naersk, day01, day01cpp }:
     utils.lib.eachDefaultSystem (system:
       let
         pkgs = import nixpkgs { inherit system; };
       in
       {
-        packages.day01 = day01.defaultPackage.${system};
-      });
+        packages = {
+          day01 = day01.defaultPackage.${system};
+          day01cpp = day01cpp.defaultPackage.${system};
+        };
+      }
+    );
 }

result

-/nix/store/bmsr9z02zcchqqij4ai42b327qg32zyv-aoc-0.1.0
\ No newline at end of file
+/nix/store/hl50b172fpp2v07pc9l1pwa1yab2hqvp-main
\ No newline at end of file