godot/core/vmap.h

/*************************************************************************/
/*  vmap.h                                                               */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2019 Godot Engine contributors (cf. AUTHORS.md)    */
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/* "Software"), to deal in the Software without restriction, including   */
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/* distribute, sublicense, and/or sell copies of the Software, and to    */
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/*************************************************************************/

#ifndef VMAP_H
#define VMAP_H

#include "typedefs.h"
#include "vector.h"

template <class T, class V>
class VMap {

	struct _Pair {

		T key;
		V value;

		_FORCE_INLINE_ _Pair() {}

		_FORCE_INLINE_ _Pair(const T &p_key, const V &p_value) {

			key = p_key;
			value = p_value;
		}
	};

	Vector<_Pair> _data;

	_FORCE_INLINE_ int _find(const T &p_val, bool &r_exact) const {

		r_exact = false;
		if (_data.empty())
			return 0;

		int low = 0;
		int high = _data.size() - 1;
		const _Pair *a = &_data[0];
		int middle = 0;

#if DEBUG_ENABLED
		if (low > high)
			ERR_PRINT("low > high, this may be a bug");
#endif
		while (low <= high) {
			middle = (low + high) / 2;

			if (p_val < a[middle].key) {
				high = middle - 1; //search low end of array
			} else if (a[middle].key < p_val) {
				low = middle + 1; //search high end of array
			} else {
				r_exact = true;
				return middle;
			}
		}

		//return the position where this would be inserted
		if (a[middle].key < p_val)
			middle++;
		return middle;
	}

	_FORCE_INLINE_ int _find_exact(const T &p_val) const {

		if (_data.empty())
			return -1;

		int low = 0;
		int high = _data.size() - 1;
		int middle;
		const _Pair *a = &_data[0];

		while (low <= high) {
			middle = (low + high) / 2;

			if (p_val < a[middle].key) {
				high = middle - 1; //search low end of array
			} else if (a[middle].key < p_val) {
				low = middle + 1; //search high end of array
			} else {
				return middle;
			}
		}

		return -1;
	}

public:
	int insert(const T &p_key, const V &p_val) {

		bool exact;
		int pos = _find(p_key, exact);
		if (exact) {
			_data[pos].value = p_val;
			return pos;
		}
		_data.insert(pos, _Pair(p_key, p_val));
		return pos;
	}

	bool has(const T &p_val) const {

		return _find_exact(p_val) != -1;
	}

	void erase(const T &p_val) {

		int pos = _find_exact(p_val);
		if (pos < 0)
			return;
		_data.remove(pos);
	}

	int find(const T &p_val) const {

		return _find_exact(p_val);
	}

	int find_nearest(const T &p_val) const {

		bool exact;
		return _find(p_val, exact);
	}

	_FORCE_INLINE_ int size() const { return _data.size(); }
	_FORCE_INLINE_ bool empty() const { return _data.empty(); }

	const _Pair *get_array() const {

		return _data.ptr();
	}

	_Pair *get_array() {

		return _data.ptr();
	}

	const V &getv(int p_index) const {

		return _data[p_index].value;
	}

	V &getv(int p_index) {

		return _data[p_index].value;
	}

	const T &getk(int p_index) const {

		return _data[p_index].key;
	}

	T &getk(int p_index) {

		return _data[p_index].key;
	}

	inline const V &operator[](const T &p_key) const {

		int pos = _find_exact(p_key);

		CRASH_COND(pos < 0);

		return _data[pos].value;
	}

	inline V &operator[](const T &p_key) {

		int pos = _find_exact(p_key);
		if (pos < 0) {
			V val;
			pos = insert(p_key, val);
		}

		return _data[pos].value;
	}
};
#endif // VMAP_H