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Why do x86-64 instructions on 32-bit registers zero the upper part of the full 64-bit register?
...ould almost never be used. (Making int 64-bit would waste cache footprint and memory bandwidth; x86-64 most efficiently supports 32 and 64-bit operand sizes)
The behaviour for 8 and 16-bit operand sizes is the strange one. The dependency madness is one of the reasons that 16-bit instructions are a...
How do I enter RGB values into Interface Builder?
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Click on the color slider icon, and then choose "RGB Sliders" from the drop-down list.
You can also use the magnifying-glass as a color picker to pick up an exact color from anywhere on the screen; also see @ken's excellent comment below clarifying how col...
Arrays, heap and stack and value types
...m what I've read on CLR via c#, the answer is yes. But what I can't understand, is what happens to the actual int's inside the array. As they are value types, I'd guess they'd have to be boxed, as I can, for example, pass myIntegers to other parts of the program and it'd clutter up the stack if they...
Write to .txt file?
...this to the file";
fprintf(f, "Some text: %s\n", text);
/* print integers and floats */
int i = 1;
float py = 3.1415927;
fprintf(f, "Integer: %d, float: %f\n", i, py);
/* printing single chatacters */
char c = 'A';
fprintf(f, "A character: %c\n", c);
fclose(f);
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Are delphi variables initialized with a value by default?
I'm new to Delphi, and I've been running some tests to see what object variables and stack variables are initialized to by default:
...
Vim: Move cursor to its last position
...r to its previous position (while in normal mode)? Something to cycle back and forth in the list of previous cursor positions would be ideal. But also just to switch to the last location would suffice (something like cd - in bash with directories).
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What is the difference between persist() and merge() in JPA and Hibernate?
What is the difference between persist() and merge() in Hibernate?
4 Answers
4
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Regex: Specify “space or start of string” and “space or end of string”
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You can use any of the following:
\b #A word break and will work for both spaces and end of lines.
(^|\s) #the | means or. () is a capturing group.
/\b(stackoverflow)\b/
Also, if you don't want to include the space in your match, you can use lookbehind/aheads.
(?<=\...
Fragment or Support Fragment?
I am developing an app that supports Android >= 4.0. It uses fragments from the android.app package. As I am facing problems with the older fragment implementation in 4.0, like this one , that are already fixed in the support library, I am considering switching back to the fragment implementation...
Why can't I have “public static const string S = ”stuff"; in my Class?
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const makes the variable constant and cannot be changed.
– Samuel
Jan 2 '09 at 22:39
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