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#pragma pack effect
...example, given 4-byte integers and the following struct:
struct Test
{
char AA;
int BB;
char CC;
};
The compiler could choose to lay the struct out in memory like this:
| 1 | 2 | 3 | 4 |
| AA(1) | pad.................. |
| BB(1) | BB(2) | BB(3) | BB(4) |
| CC(1) | pa...
How do I change bash history completion to complete what's already on the line?
...Readline library.
#
# Arrow keys in keypad mode
#
"\C-[OD" backward-char
"\C-[OC" forward-char
"\C-[OA" previous-history
"\C-[OB" next-history
#
# Arrow keys in ANSI mode
#
"\C-[[D" backward-char
"\C-[[C" forward-char
"\C-[[A" previous-history
"\C-[[B...
How can I use a DLL file from Python?
...
Next;
Application type -> DLL;
Additional options -> Empty project (select);
Additional options -> Precompiled header (unselect);
Project -> Properties -> Configuration Manager -> Active solution platform: x64;
Project -> Properties -> Configuration Manager -> Active solu...
Simple Digit Recognition OCR in OpenCV-Python
...de a small code in OpenCV. It does following things:
It loads the image.
Selects the digits ( obviously by contour finding and applying constraints on area and height of letters to avoid false detections).
Draws the bounding rectangle around one letter and wait for key press manually. This time we...
Pointer arithmetic for void pointer in C
When a pointer to a particular type (say int , char , float , ..) is incremented, its value is increased by the size of that data type. If a void pointer which points to data of size x is incremented, how does it get to point x bytes ahead? How does the compiler know to add x to value of ...
Bytes of a string in Java
...
A string is a list of characters (i.e. code points). The number of bytes taken to represent the string depends entirely on which encoding you use to turn it into bytes.
That said, you can turn the string into a byte array and then look at its si...
Storing sex (gender) in database
...,147,483,648 to 2,147,483,647
BIT 1 (2 if 9+ columns) 2 (0 and 1)
CHAR(1) 1 26 if case insensitive, 52 otherwise
The BIT data type can be ruled out because it only supports two possible genders which is inadequate. While INT supports more than two options, it takes...
How do I extract text that lies between parentheses (round brackets)?
...
Honestly, this should've been selected as the answer.
– Pat Lindley
Jan 11 '13 at 18:58
1
...
Calling constructors in c++ without new
...new object on the stack by calling a constructor of the format Thing(const char*).
The second one is a bit more complex. It essentially does the following
Create an object of type Thing using the constructor Thing(const char*)
Create an object of type Thing using the constructor Thing(const Th...
Compile time string hashing
...7b82d07L,
...
};
template<size_t idx>
constexpr uint32_t crc32(const char * str)
{
return (crc32<idx-1>(str) >> 8) ^ crc_table[(crc32<idx-1>(str) ^ str[idx]) & 0x000000FF];
}
// This is the stop-recursion function
template<>
constexpr uint32_t crc32<size_t(-...