1 files changed, 15 insertions, 0 deletions
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