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How should I print types like off_t and size_t?
...hose formatting codes (for example because you're on C89), then you have a bit of a problem since AFAIK there aren't integer types in C89 that have formatting codes and are guaranteed to be as big as these types. So you need to do something implementation-specific.
For example if your compiler has ...
Extracting bits with a single multiplication
...at a simple example of getting a single byte manipulated. Using unsigned 8 bit for simplicity. Imagine your number is xxaxxbxx and you want ab000000.
The solution consisted of two steps: a bit masking, followed by multiplication. The bit mask is a simple AND operation that turns uninteresting bits ...
How do you iterate through every file/directory recursively in standard C++?
...
If using the Win32 API you can use the FindFirstFile and FindNextFile functions.
http://msdn.microsoft.com/en-us/library/aa365200(VS.85).aspx
For recursive traversal of directories you must inspect each WIN32_FIND_DATA.dwFileAttributes ...
.NET console application as Windows service
I have console application and would like to run it as Windows service. VS2010 has project template which allow to attach console project and build Windows service.
I would like to not add separated service project and if possible integrate service code into console application to keep console appl...
How to find the JVM version from a program?
...lement of the runtime version
java.vm.name "OpenJDK 64-Bit Server VM" "Java HotSpot(TM) 64-Bit Server VM" "Java HotSpot(TM) 64-Bit Server VM" Java Virtual Machine implementation name
java.vm.vendor "Oracle Corporation" ...
“No such file or directory” error when executing a binary
....2]
I was missing the /lib/ld-linux.so.2 file, which is needed to run 32-bit apps. The Ubuntu package that has this file is libc6-i386.
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Get DOS path instead of Windows path
In a DOS window, how can I get the full DOS name/short name of the directory I am in?
11 Answers
...
Suppress warning CS1998: This async method lacks 'await'
...int result = ...;
return Task.FromResult(result);
}
In the case of throwing NotImplementedException, the procedure is a bit more wordy:
public Task<int> Fail() // note: no "async"
{
var tcs = new TaskCompletionSource<int>();
tcs.SetException(new NotImplementedException());
ret...
Efficient Algorithm for Bit Reversal (from MSB->LSB to LSB->MSB) in C
...just don't look at me when they're not as fast :)
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Low Memory (32-bit int, 32-bit machine)(from here):
unsigned int
reverse(register unsigned int x)
{
x = (((x & 0xaaaaaaaa) >> 1) | ((x & 0x55555555) << 1));
x = (((x & 0xcccccccc) >> 2) | ((x & 0x3...
How can mixed data types (int, float, char, etc) be stored in an array?
...e is tagged pointer, which involves storing more information in the "free" bits of a pointer.
Depending on architectures you can use the low or high bits, but the safest and most portable way is using the unused low bits by taking the advantage of aligned memory. For example in 32-bit and 64-bit sys...