src/containers.h

/*
	Copyright 2012-2014 Santeri Piippo
	All rights reserved.

	Redistribution and use in source and binary forms, with or without
	modification, are permitted provided that the following conditions
	are met:

	1. Redistributions of source code must retain the above copyright
	   notice, this list of conditions and the following disclaimer.
	2. Redistributions in binary form must reproduce the above copyright
	   notice, this list of conditions and the following disclaimer in the
	   documentation and/or other materials provided with the distribution.
	3. The name of the author may not be used to endorse or promote products
	   derived from this software without specific prior written permission.

	THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
	IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
	OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
	IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
	INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#ifndef BOTC_CONTAINERS_H
#define BOTC_CONTAINERS_H

#include <cassert>
#include <algorithm>
#include <deque>
#include <initializer_list>

template<class T> class list
{
	public:
		using list_type					= typename ::std::deque<T>;
		using iterator					= typename list_type::iterator;
		using const_iterator			= typename list_type::const_iterator;
		using reverse_iterator			= typename list_type::reverse_iterator;
		using const_reverse_iterator	= typename list_type::const_reverse_iterator;
		using element_type				= T;
		using self_type					= list<T>;

		// =====================================================================
		//
		list() {}

		// =====================================================================
		//
		list (std::initializer_list<element_type> vals)
		{
			m_data = vals;
		}

		// =====================================================================
		//
		list (const list_type& a) :
			m_data (a) {}

		// =====================================================================
		//
		iterator begin()
		{
			return m_data.begin();
		}

		// =====================================================================
		//
		const_iterator begin() const
		{
			return m_data.cbegin();
		}

		// =====================================================================
		//
		iterator end()
		{
			return m_data.end();
		}

		// =====================================================================
		//
		const_iterator end() const
		{
			return m_data.cend();
		}

		// =====================================================================
		//
		reverse_iterator rbegin()
		{
			return m_data.rbegin();
		}

		// =====================================================================
		//
		const_reverse_iterator crbegin() const
		{
			return m_data.crbegin();
		}

		// =====================================================================
		//
		reverse_iterator rend()
		{
			return m_data.rend();
		}

		// =====================================================================
		//
		const_reverse_iterator crend() const
		{
			return m_data.crend();
		}

		// =====================================================================
		//
		inline void erase (int pos)
		{
			assert (pos < size());
			m_data.erase (m_data.begin() + pos);
		}

		// =====================================================================
		//
		element_type& push_front (const element_type& value)
		{
			m_data.push_front (value);
			return m_data[0];
		}

		// =====================================================================
		//
		element_type& push_back (const element_type& value)
		{
			m_data.push_back (value);
			return m_data[m_data.size() - 1];
		}

		// =====================================================================
		//
		void push_back (const self_type& vals)
		{
			for (const T & val : vals)
				push_back (val);
		}

		// =====================================================================
		//
		bool pop (T& val)
		{
			if (is_empty())
				return false;

			val = m_data[size() - 1];
			m_data.erase (m_data.end() - 1);
			return true;
		}

		// =====================================================================
		//
		T& operator<< (const T& value)
		{
			return push_back (value);
		}

		// =====================================================================
		//
		void operator<< (const self_type& vals)
		{
			push_back (vals);
		}

		// =====================================================================
		//
		bool operator>> (T& value)
		{
			return pop (value);
		}

		// =====================================================================
		//
		self_type reverse() const
		{
			self_type rev;

			for (const T & val : *this)
				val >> rev;

			return rev;
		}

		// =====================================================================
		//
		void clear()
		{
			m_data.clear();
		}

		// =====================================================================
		//
		void insert (int pos, const element_type& value)
		{
			m_data.insert (m_data.begin() + pos, value);
		}

		// =====================================================================
		//
		void makeUnique()
		{
			// Remove duplicate entries. For this to be effective, the vector must be
			// sorted first.
			sort();
			iterator pos = std::unique (begin(), end());
			resize (std::distance (begin(), pos));
		}

		// =====================================================================
		//
		int size() const
		{
			return m_data.size();
		}

		// =====================================================================
		//
		element_type& operator[] (int n)
		{
			assert (n < size());
			return m_data[n];
		}

		// =====================================================================
		//
		const element_type& operator[] (int n) const
		{
			assert (n < size());
			return m_data[n];
		}

		// =====================================================================
		//
		void resize (int size)
		{
			m_data.resize (size);
		}

		// =====================================================================
		//
		void sort()
		{
			std::sort (begin(), end());
		}

		// =====================================================================
		//
		int find (const element_type& needle) const
		{
			int i = 0;

			for (const element_type& hay : *this)
			{
				if (&hay == &needle)
					return i;

				i++;
			}

			return -1;
		}

		// =====================================================================
		//
		void remove (const element_type& it)
		{
			int idx;

			if ((idx = find (it)) != -1)
				erase (idx);
		}

		// =====================================================================
		//
		inline bool is_empty() const
		{
			return size() == 0;
		}

		// =====================================================================
		//
		self_type mid (int a, int b) const
		{
			assert (a >= 0 && b >= 0 && a < size() && b < size() && a <= b);
			self_type result;

			for (int i = a; i <= b; ++i)
				result << operator[] (i);

			return result;
		}

		// =====================================================================
		//
		inline const list_type& std_deque() const
		{
			return m_data;
		}

		// =====================================================================
		//
		const element_type& first() const
		{
			return *(m_data.begin());
		}

		// =====================================================================
		//
		const element_type& last() const
		{
			return *(m_data.end() - 1);
		}

		// =====================================================================
		//
		bool contains (const element_type& a) const
		{
			return find (a) != -1;
		}

	private:
		list_type m_data;
};

// =============================================================================
//
template<class T> list<T>& operator>> (const T& value, list<T>& haystack)
{
	haystack.push_front (value);
	return haystack;
}

#endif // BOTC_CONTAINERS_H