How to cast a Pointer in C++ from class name in String?
Psuedocode:
int * ptr = something;
myStruct ptrstruct = (ClassFromString("myStruct") ptr);
// The class/struct name is passed in as String
Thank you
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Mathew Kurian
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1It's not clear; what do you want this code to do? – Oliver Charlesworth Sep 22 '13 at 22:58
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8I don't think C++ supports this kind of reflection directly. – CS Pei Sep 22 '13 at 22:58
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Perhaps you are looking for the "Class Factory" design pattern. This can be implemented in C++ fairly easily, but is not a language feature. – paddy Sep 22 '13 at 23:02
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Perhaps you can describe the problem you want to solve if you had such a way to do this? – jxh Sep 22 '13 at 23:30
2 Answers
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I'm not a c++ guru but I have two ideas that may help with brainstorming:
- May the use of the registry pattern as described here would be of help: Instantiate class from name?
- Secondly, following the registry pattern idea you could crate a function for casting e.g.
MyClass something = registry.cast("MyClass", ptr);
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I am not sure but this must work Only Void pointer or boost can help, if it happens
thing * p = something; // pointer to object
void * pv = p; // pointer to void
thing * p2 = static_cast<thing *>(pv); // pointer to the same object
Maybe same kind of situation is while returning values from Threads Overall reflection is not possible in c++. Its just brainstroming.
Charlie
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I see you what you did here, however I don't think you understood the question - partially due to my bad wording. But as an example: Something like this `thing * p2 = static_cast<"thing *">(pv);` Do you see what I did there? That is the effect I am trying to get. – Mathew Kurian Sep 22 '13 at 23:41