71 lines
1.6 KiB
MQL5
71 lines
1.6 KiB
MQL5
//+------------------------------------------------------------------+
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//| StructsComposition.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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struct Inclosure
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{
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double X, Y;
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};
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struct Main
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{
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Inclosure data;
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int code;
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};
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struct Main2
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{
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struct Inclosure2
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{
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double X, Y;
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}
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data;
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int code;
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};
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struct Main3 : Inclosure
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{
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int code;
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string xxx;
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};
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struct Base
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{
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const int mode;
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string s;
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Base(const int m) : mode(m) { }
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};
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struct Derived : Base // 'Base' - wrong parameters count
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{
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double data[10];
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Derived() : Base(1) { }
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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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Main m = {{0.1, 0.2}, -1}; // aggregate initialization
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m.data.X = 1.0; // member-wise access
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m.data.Y = -1.0;
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Main2 m2 = {{0.1, 0.2}, -1}; // aggregate initialization
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m2.data.X = 1.0; // member-wise access
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m2.data.Y = -1.0;
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Main3 m3 = {0.1, 0.2, -1};
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m3.X = 1.0;
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m3.Y = -1.0;
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Inclosure in = {10, 100};
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m3 = in;
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Print(sizeof(Main)); // 20
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Print(sizeof(Main2)); // 20
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Print(sizeof(Main3)); // 20
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}
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//+------------------------------------------------------------------+
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