大约有 6,887 项符合查询结果（耗时：0.0161秒） [XML]
How to count the number of set bits in a 32-bit integer?
...a table-lookup for 4 bits at a time of each byte in parallel. (The 4 bits index a 16 entry table held in a vector register).
On Intel CPUs, the hardware 64bit popcnt instruction can outperform an SSSE3 PSHUFB bit-parallel implementation by about a factor of 2, but only if your compiler gets it just...
How are virtual functions and vtable implemented?
...e, it's indeed structure-like. But in other contexts, but the idea of vtbl index is useful (e.g. ActiveX uses it in the way it describes dual interfaces in typelibs), which is a more array-like view.
– puetzk
Aug 2 '18 at 14:12
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Why doesn't the height of a container element increase if it contains floated elements?
...ck level above the normal floated elements. (Please don't relate this to z-index as that is completely different.)
Taking a case as an example to explain how CSS floats work, assuming we need a simple 2 column layout with a header, footer, and 2 columns, so here is what the blueprint looks like....
Best way to organize jQuery/JavaScript code (2013) [closed]
...tion() {
this.resizable({
handles: "all",
zIndex: 0,
containment: "document"
});
}
}
]);
GlobalRules.run($("body"));
// If you need to add elements later on, you can just call GlobalRules.run(yourNewElement);
This is a very potent way to r...
Why does Python code run faster in a function?
...ored in a fixed-size array (not a dict) and variable names are assigned to indexes. This is possible because you can't dynamically add local variables to a function. Then retrieving a local variable is literally a pointer lookup into the list and a refcount increase on the PyObject which is trivial....
What is the difference between the kernel space and the user space?
...al_Descriptor_Table
the segment registers CS, DS, etc., which point to the index of an entry in the GDT.
For example, CS = 0 means the first entry of the GDT is currently active for the executing code.
What can each ring do?
The CPU chip is physically built so that:
ring 0 can do anything
ri...
Is git-svn dcommit after merging in git dangerous?
...ll the changes from the svn-branch squashed into one commit waiting in the index
git commit
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How does data binding work in AngularJS?
...nd bind-once databinding to help with this problem. Furthermore it now has indexes for your repeater source, which lets you modify the list without rebuilding the dom for the entire content.
– Gaute Løken
Mar 3 '14 at 11:34
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What is private bytes, virtual bytes, working set?
... billions of memory allocations.
http://www.softwareverify.com/cpp/memory/index.html
Disclaimer: I designed Memory Validator.
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How is this fibonacci-function memoized?
... passed in and this is easy to verify. The list is a constant that is then indexed into. It is, of course, a constant that is lazily evaluated, so your program does not try to get the whole (infinite) list immediately. Since it's a constant, it can be shared across the function calls.
It's memoized...