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95 lines
2.4 KiB
C++
95 lines
2.4 KiB
C++
/* $Id$ */
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/** @file helpers.cpp Some not-so-generic helper functions. */
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#include "stdafx.h"
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#include "openttd.h"
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#include "engine_func.h"
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#include <new>
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#include "misc/blob.hpp"
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/* Engine list manipulators - current implementation is only C wrapper around CBlobT<EngineID> (see yapf/blob.hpp) */
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/* we cannot expose CBlobT directly to C so we must cast EngineList* to CBlobT<EngineID>* always when we are called from C */
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#define B (*(CBlobT<EngineID>*)el)
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/** Create Engine List (and initialize it to empty)
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* @param el list to be created
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*/
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void EngList_Create(EngineList *el)
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{
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/* call CBlobT constructor explicitly */
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new (&B) CBlobT<EngineID>();
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}
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/** Destroy Engine List (and free its contents)
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* @param el list to be destroyed
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*/
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void EngList_Destroy(EngineList *el)
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{
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/* call CBlobT destructor explicitly */
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B.~CBlobT<EngineID>();
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}
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/** Return number of items stored in the Engine List
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* @param el list for count inquiry
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* @return the desired count
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*/
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uint EngList_Count(const EngineList *el)
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{
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return B.Size();
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}
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/** Add new item at the end of Engine List
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* @param el list o which to add an engine
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* @param eid engine to add to the list
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*/
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void EngList_Add(EngineList *el, EngineID eid)
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{
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B.Append(eid);
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}
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/** Return pointer to the items array held by Engine List
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* @param el list from which the array pointer has to be returned
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* @return the pointer required
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*/
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EngineID* EngList_Items(EngineList *el)
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{
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return B.Data();
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}
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/** Clear the Engine List (by invalidating all its items == reseting item count to zero)
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* @param el list to be cleared
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*/
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void EngList_RemoveAll(EngineList *el)
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{
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B.Clear();
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}
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/** Sort all items using qsort() and given 'CompareItems' function
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* @param el list to be sorted
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* @param compare function for evaluation of the quicksort
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*/
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void EngList_Sort(EngineList *el, EngList_SortTypeFunction compare)
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{
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qsort(B.Data(), B.Size(), sizeof(**el), compare);
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}
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/** Sort selected range of items (on indices @ <begin, begin+num_items-1>)
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* @param el list to be sorted
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* @param compare function for evaluation of the quicksort
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* @param begin start of sorting
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* @param num_items count of items to be sorted
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*/
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void EngList_SortPartial(EngineList *el, EngList_SortTypeFunction compare, uint begin, uint num_items)
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{
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assert(begin <= (uint)B.Size());
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assert(begin + num_items <= (uint)B.Size());
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qsort(B.Data() + begin, num_items, sizeof(**el), compare);
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}
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#undef B
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