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Re: |SOLVED] Vector of object: cast to inherited class [message #52390 is a reply to message #52353]

Tue, 17 September 2019 09:55

Xemuth is currently offline

Xemuth
Messages: 387
Registered: August 2018
Location: France

Senior Member

OK, I got it, If we don't define Hello() as Virtual then if we do this kind of thing :

	B b;
	A* a = &b;
	a->Hello(); //Printing "Hello from A"

Since Hello() is static defined C++ will only use type of declared variable to know what function he must call.
if "a" was B* then we would have call B::Hello() etc...
However, if we set Hello() as virtual in A and redifine it in B then the function C++ must call will not be define at compilation but during the runtime, for each call of Hello() C++ will test the real type of Object (I don't know how he do it) then call the right definition (based on type of object) of the function.

	B b; 
	A* a = &b; //here Hello() is virtual in A  and redefined in B
	a->Hello();//C++ try to know real type of "a" and see it's a B object (or maybe a B* even if I store it in A*) then Printing "Hello from B"

Very Happy

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[Message index]

		\|SOLVED] Vector of object: cast to inherited class By: Xemuth on Fri, 13 September 2019 16:32
		Re: Vector of object: cast to inherited class By: Novo on Fri, 13 September 2019 21:55
		Re: Vector of object: cast to inherited class By: Novo on Sat, 14 September 2019 00:29
		Re: Vector of object: cast to inherited class By: Xemuth on Sat, 14 September 2019 13:41
		Re: Vector of object: cast to inherited class By: Novo on Sat, 14 September 2019 21:39
		Re: Vector of object: cast to inherited class By: Novo on Sat, 14 September 2019 21:45
		Re: Vector of object: cast to inherited class By: Xemuth on Sun, 15 September 2019 12:52
		Re: Vector of object: cast to inherited class By: Novo on Sun, 15 September 2019 17:31
		Re: Vector of object: cast to inherited class By: Novo on Sun, 15 September 2019 17:54
		Re: \|SOLVED] Vector of object: cast to inherited class By: Xemuth on Mon, 16 September 2019 09:35
		Re: \|SOLVED] Vector of object: cast to inherited class By: Novo on Mon, 16 September 2019 16:29
		Re: \|SOLVED] Vector of object: cast to inherited class By: Novo on Mon, 16 September 2019 16:31
		Re: \|SOLVED] Vector of object: cast to inherited class By: Xemuth on Mon, 16 September 2019 16:47
		Re: \|SOLVED] Vector of object: cast to inherited class By: Novo on Mon, 16 September 2019 17:44
		Re: \|SOLVED] Vector of object: cast to inherited class By: Xemuth on Mon, 16 September 2019 20:02
		Re: \|SOLVED] Vector of object: cast to inherited class By: Novo on Mon, 16 September 2019 20:09
		Re: \|SOLVED] Vector of object: cast to inherited class By: Xemuth on Mon, 16 September 2019 20:25
		Re: \|SOLVED] Vector of object: cast to inherited class By: Novo on Mon, 16 September 2019 23:47
		Re: \|SOLVED] Vector of object: cast to inherited class By: Xemuth on Tue, 17 September 2019 09:55
		Re: \|SOLVED] Vector of object: cast to inherited class By: Xemuth on Tue, 17 September 2019 14:11

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