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In theory if you were writing your own memory system you could totally design it to behave exactly the way you said. To answer your question it has to do with the design of the memory management system. Also depends on the bitness of the process.
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Nothing it could do but throw a "can't do that" exception. So you probably see the problem now, reducing the size of an array does not guarantee that a hole is created that's big enough to fit those three fields.
#Nvivo 10 models stop elements from moving every time i add new element free
Guarantees that there is always enough space to store the free block size after the object is collected. It also has a minimum size, 12 bytes in 32-bit mode. The two extra fields in the object header (syncblock and type handle) then turn into a backward and forward pointer to the previous/next free block. Everybody knows what it does, what isn't so obvious that it continues to live on after an object is collected. At a minimum, the manager needs to know the size of the hole and needs to keep track of their location. It is the job of any heap implementation to keep track of holes in the heap. So we have to claim a new sequence of adjoined memory blocks with the desired bigger size, copy our entries there and remove our claim of the old space.īut why create a new array with smaller size? Why can the array not just remove its claim of the last memory blocks? Then it would be an O(1) operation instead of O(n), as it is now.ĭoes it have something to do with how the data is organized on a computer architectural or physical level? If we need a bigger array I understand that we cannot add memory to it since the memory next to it may already be claimed by some other data. Until the new one is filled the rest of the elements in the old arrayĪn array is a sequence of adjoined memory blocks. If newSize is less than the Length of the old array, a new array isĪllocated and elements are copied from the old array to the new one
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If newSize is greater than the Length of the old array, a new array isĪllocated and all the elements are copied from the old array to the On the MSDN Documentation site it says the following about the Array.Resize method: