From c9b6b9a5ca082fe7c1b6f58d7713f785a9eb6a5c Mon Sep 17 00:00:00 2001
From: Martial Simon <msimon_fr@hotmail.com>
Date: Mon, 15 Sep 2025 01:08:27 +0200
Subject: add: graphs et rushs

---
 graphs/cpp/exist_functor/example.cc | 24 ++++++++++++++++++++++++
 graphs/cpp/exist_functor/exist.hh   | 14 ++++++++++++++
 graphs/cpp/exist_functor/exist.hxx  | 15 +++++++++++++++
 3 files changed, 53 insertions(+)
 create mode 100644 graphs/cpp/exist_functor/example.cc
 create mode 100644 graphs/cpp/exist_functor/exist.hh
 create mode 100644 graphs/cpp/exist_functor/exist.hxx

(limited to 'graphs/cpp/exist_functor')

diff --git a/graphs/cpp/exist_functor/example.cc b/graphs/cpp/exist_functor/example.cc
new file mode 100644
index 0000000..d580f7b
--- /dev/null
+++ b/graphs/cpp/exist_functor/example.cc
@@ -0,0 +1,24 @@
+#include <iostream>
+
+#include "exist.hh"
+
+int main()
+{
+    Exist<int> exist_int;
+    Exist<std::string> exist_str;
+
+    // Test with integers
+    std::cout << std::boolalpha;
+    std::cout << exist_int(1) << std::endl; // Prints false
+    std::cout << exist_int(2) << std::endl; // Prints false
+    std::cout << exist_int(1) << std::endl; // Prints true
+    std::cout << exist_int(3) << std::endl; // Prints false
+
+    // Test with strings
+    std::cout << exist_str(std::string("Hello")) << std::endl; // Prints false
+    std::cout << exist_str(std::string("World")) << std::endl; // Prints false
+    std::cout << exist_str(std::string("Hello")) << std::endl; // Prints true
+    std::cout << exist_str(std::string("C++")) << std::endl; // Prints false
+
+    return 0;
+}
diff --git a/graphs/cpp/exist_functor/exist.hh b/graphs/cpp/exist_functor/exist.hh
new file mode 100644
index 0000000..49cafd6
--- /dev/null
+++ b/graphs/cpp/exist_functor/exist.hh
@@ -0,0 +1,14 @@
+#pragma once
+#include <vector>
+
+template <class T>
+class Exist
+{
+public:
+    bool operator()(T x);
+
+private:
+    std::vector<T> seen_;
+};
+
+#include "exist.hxx"
diff --git a/graphs/cpp/exist_functor/exist.hxx b/graphs/cpp/exist_functor/exist.hxx
new file mode 100644
index 0000000..638c4e3
--- /dev/null
+++ b/graphs/cpp/exist_functor/exist.hxx
@@ -0,0 +1,15 @@
+#pragma once
+#include <algorithm>
+
+#include "exist.hh"
+
+template <class T>
+bool Exist<T>::operator()(T x)
+{
+    if (std::find(seen_.begin(), seen_.end(), x) == seen_.end())
+    {
+        seen_.push_back(x);
+        return false;
+    }
+    return true;
+}
\ No newline at end of file
-- 
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