![]() ![]() Since modern programs performances are often dominated by cache misses, SDS may perform better in many workloads. Over the time the buffer is reallocated, and it is likely that it ends in a totally different part of memory compared to the structure itself. Usually when you access a string created by a string library using a structure, you have two different allocations for the structure representing the string, and the actual buffer holding the string. The trick is the size is hidden before the adress of the buffer.("Learn this one simple trick that will change your life for ever").Īdvantage #1: you can pass SDS strings to functions designed for C functions without accessing a struct member or calling a functionĪdvantage #2: accessing individual chars is straightforward.Īdvantage #3: single allocation has better cache locality. Thanks to the someone who recommended it on HN some years ago. Procedure FindStringIndexChris(String.s, StringFind.s, Index.i)ĭefine String.I always use antirez's (Redis creator) `sds` and advertise it whenvever I get the chance. Position = FindString(string, StringFind, Position) If Index > 0 And Not String = "" And Not StringFind = "" Procedure FindStringIndexLord(string.s, StringFind.s, Index.i) *String + LenStringFind * SizeOf(character)ĭebug "FindStringIndex(" + String + ", " + StringFind + ", 2) = " + FindStringIndex(String, StringFind, 2)ĭebug "FindStringIndex(" + String + ", " + StringFind + ", 0) = " + FindStringIndex(String, StringFind, 0)ĭebug "FindStringIndex(" + String + ", " + StringFind + ", 1) = " + FindStringIndex(String, StringFind, 1)ĭebug "FindStringIndex(" + String + ", " + StringFind + ", 3) = " + FindStringIndex(String, StringFind, 3)ĭebug "FindStringIndex(" + String + ", " + StringFind + ", 4) = " + FindStringIndex(String, StringFind, 4) ![]() ![]() If Index = LenStringFind And CompareMemoryString(*String, *StringFind, #PB_String_CaseSensitive, LenStringFind) = #PB_String_Equal) Protected LenStringFind.i, Find.i, FindIndex.i, Position.i, Exit.i Protected *String.character, *StringFind.character Procedure FindStringIndex(String.s, StringFind.s, Index.i) String.s = "words/are/separated/by/bracketed/delimiters/like/this."ĭebug Find_String_Index(string.s, "/", 2) <- Will return 10ĭebug Find_String_Index(string.s, "/", 5) <- Will return 33ĭebug Find_String_Index(string.s, "/", 7) <- Will return 49ĭebug Find_String_Index(string.s, "/", 8) <- Will return 0 since there are only 7 sub-stringsĭebug Find_String_Index(string.s, "/", 0) <- Test nonsense value, will return 0 ![]() ProcedureReturn foundpos.q Return character position where this count foundĭefine string.s = "words()are()separated()by()bracketed()delimiters()like()this."ĭebug Find_String_Index(string.s, "()", 2) <- Will return 11ĭebug Find_String_Index(string.s, "()", 5) <- Will return 37ĭebug Find_String_Index(string.s, "()", 7) <- Will return 55ĭebug Find_String_Index(string.s, "()", 8) <- Will return 0 since there are only 7 sub-stringsĭebug Find_String_Index(string.s, "()", 0) <- Test nonsense value, will return 0 Stpos.q = findpos.q + 1 Set next start position one char on from found pos.įoundpos.q = findpos.q Set the position of the final 'index' occurrenceĭone.b = #True FindString() didn't find, so nothing more to do If findpos.q Found sub-string with position findpos.qįindcnt.q + 1 Increment our occurrence counter While Not(done.b) Loop until exit flag setįindpos.q = FindString(string.s, find.s, stpos.q) Find sub-string with rolling start position stpos Stpos.q = 1 Start at position 1 of string to be searched If index.q > 0 Index.q value must be at least 1 Procedure.q Find_String_Index(string.s, find.s, index.q)ĭefine findpos.q Running FindString() result for each occurrenceĭefine foundpos.q Found position of n-th occurrenceĭefine findcnt.q Running counter of found sub-stringĭefine stpos.q Running start position for FindString() ** Find position of n-th occurrence of a sub-string in a string - for example the 3rd "/" in 1/2/3/4/5 would be 6 ![]()
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