From 26e9b317ecc7219f4599a3084f12b56e39d7f0d7 Mon Sep 17 00:00:00 2001
From: Michael Mandl <mandlm@molez.net>
Date: Fri, 15 Mar 2024 10:28:47 +0100
Subject: [PATCH 1/2] chore: add functor

---
 Functor/CMakeLists.txt | 21 +++++++++++++++++++++
 Functor/bootstrap.sh   |  1 +
 Functor/build.sh       |  1 +
 Functor/main.cpp       |  8 ++++++++
 4 files changed, 31 insertions(+)
 create mode 100644 Functor/CMakeLists.txt
 create mode 120000 Functor/bootstrap.sh
 create mode 120000 Functor/build.sh
 create mode 100644 Functor/main.cpp

diff --git a/Functor/CMakeLists.txt b/Functor/CMakeLists.txt
new file mode 100644
index 0000000..b99f5ca
--- /dev/null
+++ b/Functor/CMakeLists.txt
@@ -0,0 +1,21 @@
+cmake_minimum_required(VERSION 3.20)
+
+project(
+  Functor
+  VERSION 0.1.0
+  LANGUAGES CXX)
+
+list(APPEND CMAKE_MODULE_PATH "${PROJECT_SOURCE_DIR}/../cmake")
+
+include(ExportCompileCommands)
+include(sccache)
+
+add_executable(Functor main.cpp)
+
+target_compile_features(Functor PUBLIC cxx_std_20)
+
+set_target_properties(
+  Functor
+  PROPERTIES ARCHIVE_OUTPUT_DIRECTORY "${PROJECT_SOURCE_DIR}/bin"
+             RUNTIME_OUTPUT_DIRECTORY "${PROJECT_SOURCE_DIR}/bin"
+             RUNTIME_OUTPUT_DIRECTORY "${PROJECT_SOURCE_DIR}/bin")
diff --git a/Functor/bootstrap.sh b/Functor/bootstrap.sh
new file mode 120000
index 0000000..796ed13
--- /dev/null
+++ b/Functor/bootstrap.sh
@@ -0,0 +1 @@
+../scripts/bootstrap.sh
\ No newline at end of file
diff --git a/Functor/build.sh b/Functor/build.sh
new file mode 120000
index 0000000..0eff50d
--- /dev/null
+++ b/Functor/build.sh
@@ -0,0 +1 @@
+../scripts/build.sh
\ No newline at end of file
diff --git a/Functor/main.cpp b/Functor/main.cpp
new file mode 100644
index 0000000..f25326b
--- /dev/null
+++ b/Functor/main.cpp
@@ -0,0 +1,8 @@
+#include <iostream>
+
+int main(int argc, char *argv[]) {
+
+  std::cout << "Functor" << std::endl;
+
+  return EXIT_SUCCESS;
+}

From 659e010a7093d501c36f51bc2781151e6593d581 Mon Sep 17 00:00:00 2001
From: Michael Mandl <mandlm@molez.net>
Date: Fri, 15 Mar 2024 10:39:42 +0100
Subject: [PATCH 2/2] feat: implement join-string functor

---
 Functor/main.cpp | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/Functor/main.cpp b/Functor/main.cpp
index f25326b..c771ff8 100644
--- a/Functor/main.cpp
+++ b/Functor/main.cpp
@@ -1,8 +1,39 @@
 #include <iostream>
+#include <numeric>
+#include <vector>
+
+class join_strings_functor {
+private:
+  std::string separator_ = " ";
+
+public:
+  join_strings_functor() = default;
+  join_strings_functor(std::string_view separator) : separator_(separator) {}
+
+  std::string operator()(const std::string &left,
+                         const std::string &right) const {
+    return left + separator_ + right;
+  }
+};
 
 int main(int argc, char *argv[]) {
 
   std::cout << "Functor" << std::endl;
 
+  std::vector<std::string> names = {"Albert", "Bernd", "Cora",
+                                    "Dave",   "Emil",  "Frank"};
+
+  auto space_joined_string =
+      std::accumulate(std::next(names.begin()), names.end(), names.front(),
+                      join_strings_functor());
+
+  std::cout << "Space-joined string: " << space_joined_string << std::endl;
+
+  auto comma_joined_string =
+      std::accumulate(std::next(names.begin()), names.end(), names.front(),
+                      join_strings_functor(", "));
+
+  std::cout << "Comma-joined string: " << comma_joined_string << std::endl;
+
   return EXIT_SUCCESS;
 }