From a6457aea04d1705f5b03f9c9e628bebbefdcf64c Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Mon, 1 May 2023 18:14:49 +0100
Subject: Add the pack container

Keeps its elements densely packed together without any interest in order
---
 lib/pack.h | 42 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 lib/pack.h

(limited to 'lib')

diff --git a/lib/pack.h b/lib/pack.h
new file mode 100644
index 0000000..92c8b20
--- /dev/null
+++ b/lib/pack.h
@@ -0,0 +1,42 @@
+#pragma once
+
+#include <utility>
+
+template<typename T, template<typename... S> typename Container> class pack : protected Container<T> {
+public:
+	using Container<T>::Container;
+
+	using Container<T>::begin;
+	using Container<T>::end;
+	using Container<T>::rbegin;
+	using Container<T>::rend;
+	using Container<T>::cbegin;
+	using Container<T>::cend;
+	using Container<T>::crbegin;
+	using Container<T>::crend;
+	using Container<T>::clear;
+	using Container<T>::empty;
+	using Container<T>::size;
+	using Container<T>::capacity;
+	using Container<T>::shrink_to_fit;
+	using Container<T>::at;
+	using Container<T>::data;
+	using Container<T>::operator[];
+
+	template<typename... Ps>
+	decltype(auto)
+	emplace(Ps &&... ps)
+	{
+		return Container<T>::emplace_back(std::forward<Ps>(ps)...);
+	}
+
+	void
+	erase(typename Container<T>::iterator pos)
+	{
+		pos->~T();
+		if (&*pos != &Container<T>::back()) {
+			new (&*pos) T(std::move(Container<T>::back()));
+		}
+		Container<T>::pop_back();
+	}
+};
-- 
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