大约有 4,600 项符合查询结果（耗时：0.0198秒） [XML]
Sort points in clockwise order?
...;
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This is faster, because the compiler (tested on Visual C++ 2015) doesn't generate jump to compute dax, day, dbx, dby. Here the output assembly from the compiler:
; 28 : const int dax = ((a.x() - center.x()) > 0) ? 1 : 0;
vmovss xmm2, DWORD PTR [ecx]
vmovss xmm...
Is there any advantage of using map over unordered_map in case of trivial keys?
A recent talk about unordered_map in C++ made me realize that I should use unordered_map for most cases where I used map before, because of the efficiency of lookup ( amortized O(1) vs. O(log n) ). Most times I use a map, I use either int or std::string as the key type; hence, I've got...
asynchronous vs non-blocking
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Module X: "I".
Module Y: "bookstore".
X asks Y: do you have a book named "c++ primer"?
blocking: before Y answers X, X keeps waiting there for the answer. Now X (one module) is blocking. X and Y are two threads or two processes or one thread or one process? we DON'T know.
non-blocking: before Y a...
How do I check if a string is valid JSON in Python?
...he call stack and can be used as necessary (the procedural/C way). Just as C++ doesn't force you to use exceptions (you can use errno), Python shouldn't force it, either
– Braden Best
Jun 12 '18 at 1:17
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Does ruby have real multithreading?
...his answer is about the Shotgun VM, which doesn't exist anymore. The "new" C++ VM does not use green threads scheduled across multiple VMs (i.e. Erlang/BEAM style), it uses a more traditional single VM with multiple native OS threads model, just like the one employed by, say, the CLR, Mono, and pret...
Abstract class in Java
...good analogy would be to a method declaration (but no implementation) in a C++ header file?
– Schwaitz
Feb 20 '17 at 16:18
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Truly understanding the difference between procedural and functional
.... It is not referentially transparent. In comparison, the std::max(a,b) in C++ will always return the same result given the same arguments, and has no side-effects (that I know of...).
– Andy Thomas
Mar 7 '11 at 22:50
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Simple Digit Recognition OCR in OpenCV-Python
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For those who interested in C++ code can refer below code.
Thanks Abid Rahman for the nice explanation.
The procedure is same as above but, the contour finding uses only first hierarchy level contour, so that the algorithm uses only outer contour fo...
Is it better to use C void arguments “void foo(void)” or not “void foo()”? [duplicate]
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That is the correct way to say "no parameters" in C, and it also works in C++.
But:
void foo();
Means different things in C and C++! In C it means "could take any number of parameters of unknown types", and in C++ it means the same as foo(void).
Variable argument list functions are inherently ...
Is there a replacement for unistd.h for Windows (Visual C)?
...y simple console program written for Unix to the Windows platform ( Visual C++ 8.0 ). All the source files include "unistd.h", which doesn't exist. Removing it, I get complaints about misssing prototypes for 'srandom', 'random', and 'getopt'.
I know I can replace the random functions, and I'm prett...