How To Resolve Negative Term?
November 30, 2021
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- Large legacy products tend to use more memory and require poorer data format than composition based systems, which is costly in terms of runtime in terms of speed due to cache behavior (when everything is connected, when densely packed) possible).
- Virtual calling requires going to just about any virtual function table to help you get the right function for a phone call. This can be costly if you need to cache the behavior of the calling function.
- Multiple monetary gifts increase the cost of virtual role calls, as achieving the ideal virtual table may require first calculating a countermeasure throughout the order.
- If you are using RTTI, you will see additional data in the city set compared to our vtable. Does this affect the tableA location that disables caching again.
answered Oct 17, 2011 at 14:55
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If a socket class contains virtual functions, each of the scripts for it and its descendants can have a pointer to almost any virtual function table, increasing their internal memory requirements by the size of a particular pointer. Calling virtual functions can have an additional level of indirection compared to non-virtual functions, so the call time is usually short and now it comes at a cost. This
otherwise there is no negative shock. Inheriting one class from another without using polymorphism (i.e. no web functions, always calling methods via hints for a derived class) never resulted inratam for the class, this is not a sufficient reason for the parents.
Update: I looked at inheriting efficiency effects here. Other reviews say more about object-oriented programming accuracy.
answered Oct 18 ’08 at 17:20
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The first drawback is one of the sizes of our object in memory, the second, which uses virtual functions, has a free pointer to the virtual table of sentences.
Virtual function calls also require several additional build steps that are periodically checked for calls.
The size of an object can always increase as an object of a training block. If a , A is derived from B , contains all information received from B . Of course, this doesn’t happen with well thought out mods, because even if you didn’t have inheritance from A , all ideas would be in B .
Another problem would be using dynamic_cast with static_cast , which you won’t find in any non-inheritance environment, but it can also be avoided even with legacy.
answered Oct 17 ’11 at 14:52
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The only impact on runtime might be performance in terms of memory and speed. Given that in terms of functionality, everything can be done without inheritance, the only question is whether it works well instead of helping you with the alternatives. It depends on the specific scenarios thatWhich you really want to compare and the code that the compiler runs.
answered October 20, 2011 at 14:43
34.3K
Inheritance can negatively impact data locality, which is actually very important when someone is about to crack a lot of numbers. You also have less control over data composition than with composition, so your objects are likely to take up more memory.
If you also use polymorphism, you will waste a few more cycles on indirect function calls and get even worse data locality than virtual reference function tables.
In general, the overhead of object oriented programming has always been quite low, and you think aboutthis only when dealing with large amounts of marketing information. See Sony’s presentation “The Pitfalls of Object-Oriented Programming” for a game developer perspective on performance.
answered Oct 20, 2011 at 02:52 pm
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After reading the other (informative!) answers, I think the long-term negative impact hasn’t been mentioned yet:
Inheritance is often used to obtain polymorphism. In C ++, this is the same as dragging past references (C ++ references or pointers) from the base type instead of passing all values, so as not to exploit the slice problem. In addition to exercise, references often mean that each of the object’s areas of action requires n It will increase its lifespan a lot, so people are starting to use good old fashioned dynamic RAM management (like new and remove ). And could that open up a whole bunch of worms?
To be short, very often inheritance goes hand in hand with dynamic memory allocation, which opens up a whole new class of problems.
answered Oct 21, 2011 at 2:40 pm
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Since you tagged your post with the C ++ tag, I would like to add one of the main reading effects when using a virtual reason in C ++ like not being able to use them on the web …
Actually the mostIt is not the virtual garden furniture search function that has the biggest performance impact, but the fact that the compiler cannot extend the numeric function even if you write one of them. ‘in between as inline <. declare / code>. This prevents significant optimizations that could make your prefix much faster.
Resolved on October 21, 2011 7:19 am.
I would think that inheritance would only improve performance. If owners rewrite code using multiple vendors, the code must be compiled multiple times.
decided on October 20, 2011 at 14:43
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