forked from rosh/MQL5Book
90 lines
2.6 KiB
MQL5
90 lines
2.6 KiB
MQL5
//+------------------------------------------------------------------+
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//| ArrayRemove.mq5 |
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//| Copyright 2021, MetaQuotes Ltd. |
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//| https://www.mql5.com |
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//+------------------------------------------------------------------+
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#define PRTS(A) Print(#A, "=", (string)(A) + " / status:" + (string)GetLastError())
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//+------------------------------------------------------------------+
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//| Simple struct |
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//+------------------------------------------------------------------+
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struct Simple
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{
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int x;
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};
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//+------------------------------------------------------------------+
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//| Looked like simple struct, but not so |
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//+------------------------------------------------------------------+
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struct NotSoSimple
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{
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int x;
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string s; // string field makes compiler create implicit destructor
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};
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//+------------------------------------------------------------------+
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//| Script program start function |
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//+------------------------------------------------------------------+
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void OnStart()
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{
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Simple structs1[10];
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PRTS(ArrayRemove(structs1, 0, 5)); // true / status:0
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NotSoSimple structs2[10];
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PRTS(ArrayRemove(structs2, 0, 5)); // false / status:4005, ERR_STRUCT_WITHOBJECTS_ORCLASS
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ResetLastError();
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int dynamic[];
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int dynamic2Dx4[][4];
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int fixed[][4] = {{1, 2, 3, 4}, {5, 6, 7, 8}};
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// duplicate array twice with exact and "flattened" structure
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ArrayCopy(dynamic, fixed);
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ArrayCopy(dynamic2Dx4, fixed);
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// show original data
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ArrayPrint(dynamic);
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/*
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1 2 3 4 5 6 7 8
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*/
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ArrayPrint(dynamic2Dx4);
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/*
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[,0][,1][,2][,3]
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[0,] 1 2 3 4
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[1,] 5 6 7 8
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*/
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PRTS(ArrayRemove(fixed, 0, 1));
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ArrayPrint(fixed);
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/*
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ArrayRemove(fixed,0,1)=true / status:0
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[,0][,1][,2][,3]
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[0,] 5 6 7 8
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[1,] 5 6 7 8
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*/
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PRTS(ArrayRemove(dynamic2Dx4, 0, 1));
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ArrayPrint(dynamic2Dx4);
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/*
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ArrayRemove(dynamic2Dx4,0,1)=true / status:0
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[,0][,1][,2][,3]
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[0,] 5 6 7 8
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*/
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PRTS(ArrayRemove(dynamic, 2, 3));
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ArrayPrint(dynamic);
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/*
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ArrayRemove(dynamic,2,3)=true / status:0
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1 2 6 7 8
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*/
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PRTS(ArrayRemove(dynamic, 21));
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ArrayPrint(dynamic);
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/*
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ArrayRemove(dynamic,2,3)=false / status:5052, ERR_SMALL_ARRAY
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1 2 6 7 8
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*/
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}
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//+------------------------------------------------------------------+
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