57 lines
1.7 KiB
MQL5
57 lines
1.7 KiB
MQL5
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//+------------------------------------------------------------------+
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//| FinalDelete.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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//+------------------------------------------------------------------+
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//| Base stub |
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//+------------------------------------------------------------------+
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class Base
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{
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public:
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void method() { Print(__FUNCSIG__); }
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};
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//+------------------------------------------------------------------+
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//| Derived stub |
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//+------------------------------------------------------------------+
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class Derived final : public Base
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{
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public:
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void method() = delete;
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void derivedMethod() { Print(__FUNCSIG__); }
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};
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/*
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// ERROR:
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// cannot inherit from 'Derived' as it has been declared as 'final'
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class Concrete : public Derived
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{
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};
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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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Base *b;
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Derived d;
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b = &d;
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b.method();
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((Derived *)b).derivedMethod(); // explicit typecasting in-place
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/*
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// ERROR:
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// attempting to reference deleted function 'void Derived::method()'
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// function 'void Derived::method()' was explicitly deleted
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((Derived *)b).method();
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d.method();
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*/
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}
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//+------------------------------------------------------------------+
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