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#include "..\lib\collection.h"
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struct _history {
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	collection items;
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	int active;
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	void clear();
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	int add();
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	int back();
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	int forward();
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	dword current();
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};
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int _history::add(dword in)
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{
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	if (!strcmp(in, items.get(active-1))) return 0;
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	items.count = active;
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	items.add(in);
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	active++;
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	return 1;
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}
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int _history::back()
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{
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	if (active==1) return 0;
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	active--;
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	return 1;
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}
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int _history::forward()
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{
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	if (active==items.count) return 0;
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	active++;
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	return 1;
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}
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dword _history::current()
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{
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	return items.get(active-1);
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}
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:void _history::clear()
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{
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	items.drop();
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	active=0;
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}