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Why is creating a Thread said to be expensive?
...kes its creation expensive? I'm taking the statement as true, but I'm just interested in mechanics of Thread creation in JVM.
...
LPCSTR, LPCTSTR and LPTSTR
...i.e. a mutable T-string pointer, not an LPCTSTR. What you are doing is
1) convert string (a CString at a guess) into an LPCTSTR (which in practise means getting the address of its character buffer as a read-only pointer)
2) convert that read-only pointer into a writeable pointer by casting away it...
static const vs #define
.... It also has the advantage that it has no type, so it can be used for any integer value without generating warnings.
Advantages of "const"s are that they can be scoped, and they can be used in situations where a pointer to an object needs to be passed.
I don't know exactly what you are getting at...
What's the best way to do a backwards loop in C/C#/C++?
...ould say that the most typographically pleasing way of doing this is
for (int i = myArray.Length; i --> 0; )
{
//do something
}
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What is the difference between i++ and ++i?
...like to know when to use i++ or ++i ( i being a number variable like int , float , double , etc). Anyone who knows this?
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Javascript object Vs JSON
...worth noting that a key in JSON must be enclosed in double quotes.
If I convert the above object to JSON using var jSonString = JSON.stringify(testObject);, what is the difference between the 2 (JS obj and JSON)?
JSON is a data interchange format. It's a standard which describes how ordered lis...
Condition within JOIN or WHERE
...u only those records that have an order dated later than May 15, 2009 thus converting the left join to an inner join.
The second will give those records plus any customers with no orders. The results set is very different depending on where you put the condition. (Select * is for example purposes on...
Display image as grayscale using matplotlib
...s plt
from PIL import Image
fname = 'image.png'
image = Image.open(fname).convert("L")
arr = np.asarray(image)
plt.imshow(arr, cmap='gray', vmin=0, vmax=255)
plt.show()
If you want to display the inverse grayscale, switch the cmap to cmap='gray_r'.
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C99 stdint.h header and MS Visual Studio
To my amazement I just discovered that the C99 stdint.h is missing from MS Visual Studio 2003 upwards. I'm sure they have their reasons, but does anyone know where I can download a copy? Without this header I have no definitions for useful types such as uint32_t, etc.
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Why is transposing a matrix of 512x512 much slower than transposing a matrix of 513x513?
...ze of 64 bytes. Each line can hold 8 of the elements in the matrix (64-bit int).
The critical stride would be 2048 bytes, which correspond to 4 rows of the matrix (which is continuous in memory).
Assume we're processing row 28. We're attempting to take the elements of this row and swap them with...