大约有 2,196 项符合查询结果（耗时：0.0175秒） [XML]
std::vector performance regression when enabling C++11
...han for C++98 mode and inlining the function
void std::vector<Item,std::allocator<Item>>::_M_emplace_back_aux<Item>(Item&&)
fails in C++11 mode with the default inline-limit.
This failed inline has a domino effect. Not because this function is being called
(it is not eve...
What's the need of array with zero elements?
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This is a way to have variable sizes of data, without having to call malloc (kmalloc in this case) twice. You would use it like this:
struct bts_action *var = kmalloc(sizeof(*var) + extra, GFP_KERNEL);
This used to be not standard and was considered a hack (as Aniket said), but it was standa...
What Makes a Method Thread-safe? What are the rules?
...ble is that it is only visible from within the local scope, not that it is allocated on the temporary pool. It is perfectly legal and possible to access the same local variable from two different threads. You can do so by using anonymous methods, lambdas, iterator blocks or async methods.
Is th...
How do I get Windows to go as fast as Linux for compiling C++?
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If you allocate a piece of a memory as a ramdisk, it's not available to the kernel for caching or use for anything else. In effect, you're wringing its hand and forcing it to use less memory for its own algorithms. My knowledge is e...
Is recursion ever faster than looping?
...airly expensive compared to iteration (in general) because it requires the allocation of a new stack frame. In some C compilers, one can use a compiler flag to eliminate this overhead, which transforms certain types of recursion (actually, certain types of tail calls) into jumps instead of function...
GridLayout and Row/Column Span Woe
...oducing GridLayout shows this diagram of how spans impact automatic index allocation:
5 Answers
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Which is more preferable to use: lambda functions or nested functions ('def')?
...equivalent. The last test took more time because python probably needed to allocate space every time it defined that lambda function.
– hlin117
Nov 21 '14 at 6:19
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What GRANT USAGE ON SCHEMA exactly do?
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The access are allocated according to a hierarchical model : BD --> SCHEMA --> TABLES . With GRANT USAGE ON SCHEMA , the admin user can't create table but he can do it with ALL GRANT ALL ON SCHEMA ....
– bilel...
How to read a large file - line by line?
...open(input_file)
for line in f:
do_stuff(line)
f.close()
it does not allocate a full list. It iterates over the lines.
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Why doesn't C++ have a garbage collector?
...calls!
Languages with GC have two work arounds:
don't use GC when stack allocation is sufficient: it's normally for performance issues, but in our case it really helps since the scope defines the lifetime
using construct... but it's explicit (weak) RAII while in C++ RAII is implicit so that the u...