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Can someone explain __all__ in Python?
I have been using Python more and more, and I keep seeing the variable __all__ set in different __init__.py files. Can someone explain what this does?
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What does gcc's ffast-math actually do?
...h, it enables reciprocal approximations for division and reciprocal square root.
Further, it disables signed zero (code assumes signed zero does not exist, even if the target supports it) and rounding math, which enables among other things constant folding at compile-time.
Last, it generates code ...
Debugging sqlite database on the device
.../db-file" > /sdcard/db-file.sqlite
This will copy your db-file to the root of your SD card / external storage. Now you can easily get it from there by using file manager, adb pull or whatever else you like. Note that with this approach, there is NO need for your app to have WRITE_EXTERNAL_STORA...
Are SVG parameters such as 'xmlns' and 'version' needed?
...what specification a SVG
document conforms to. It is only allowed on the root element. It
is purely advisory and has no influence on rendering or processing.
PS: The SVG 2 is far from becoming a standard yet.
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Get size of folder or file
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Be careful if you run this in the C: root directory on a Windows machine; there's a system file there which is (according to java.io.File) neither a file nor a directory. You might want to change the else-clause to check that the File is actually a directory.
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What are the disadvantages to declaring Scala case classes?
... represented as a class
hierarchy, with an abstract base class Expr as the root, and two
subclasses Number and Sum. Then, an expression 1 + (3 + 7) would be represented as
new Sum( new Number(1), new Sum( new Number(3), new Number(7)))
abstract class Expr {
def eval: Int
}
class Number(n: Int) e...
How do I start my app on startup?
...dify the code, to launch an android application at startup: AutoStart - No root
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MFC 中CImageList的用法 - C/C++ - 清泛网 - 专注C/C++及内核技术
...ap;
CBitmap* pBitmap;
CString strFileName;
strFileName.Format("%s\\res\\root.bmp", szPath);
hBitmap=(HBITMAP)::LoadImage(::AfxGetInstanceHandle(), (LPCTSTR)strFileName, IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE);
pBitmap = new CBitmap;
pBitmap->Attach(hBitmap);
m_pImageList->Add(pBitmap,RGB(0,0,0)...
How to create circle with Bézier curves?
...nnot be expressed exactly with a cubic, because a circle contains a square root in its equation. As a consequence, you have to approximate.
To do this, you have to divide your circle in n-tants (e.g.quadrants, octants). For each n-tant, you use the first and last point as the first and last of the ...
How to find all the subclasses of a class given its name?
I need a working approach of getting all classes that are inherited from a base class in Python.
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