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How do I convert Long to byte[] and back in java
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public byte[] longToBytes(long x) {
ByteBuffer buffer = ByteBuffer.allocate(Long.BYTES);
buffer.putLong(x);
return buffer.array();
}
public long bytesToLong(byte[] bytes) {
ByteBuffer buffer = ByteBuffer.allocate(Long.BYTES);
buffer.put(bytes);
buffer.flip();//need flip ...
Can't specify the 'async' modifier on the 'Main' method of a console app
...f my async console apps:
static void Main(string[] args)
{
CancellationTokenSource cts = new CancellationTokenSource();
System.Console.CancelKeyPress += (s, e) =>
{
e.Cancel = true;
cts.Cancel();
};
MainAsync(args, cts.Token).GetAwaiter.GetResult();
}
st...
Removing trailing newline character from fgets() input
... helpful answer. Can we use strlen(buffer) when buffer size is dynamically allocated using malloc ?
– rrz0
Nov 10 '18 at 10:16
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Responding with a JSON object in Node.js (converting object/array to JSON string)
...etails = data;
}
})
res.writeHead(200,{'x-auth-token':'Auth Token'})
res.write(JSON.stringify(user_details)) // Json to String Convert
res.end();
}
}).listen(8000);
I have used the above code in my existing project.
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C pointer to array/array of pointers disambiguation
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So, for 32 bit systems: int* arr[8]; /* 8x4 bytes allocated, for each pointer / int (*arr)[8]; / 4 bytes allocated, only a pointer */
– George
May 13 '09 at 18:43
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What Every Programmer Should Know About Memory?
...gepages work well on Linux without having to manually use hugetlbfs. Make allocations >= 2MiB with 2MiB alignment (e.g. posix_memalign, or an aligned_alloc that doesn't enforce the stupid ISO C++17 requirement to fail when size % alignment != 0).
A 2MiB-aligned anonymous allocation will use hug...
Should I compile with /MD or /MT?
... of the CRT - which means they will all share a single CRT heap and memory allocated in one .exe/.dll can be freed in another.
If you use the static CRT for your .exe and all .dlls then they'll all get a seperate copy of the CRT - which means they'll all use their own CRT heap so memory must be fre...
How to append rows to an R data frame
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Not knowing what you are trying to do, I'll share one more suggestion: Preallocate vectors of the type you want for each column, insert values into those vectors, and then, at the end, create your data.frame.
Continuing with Julian's f3 (a preallocated data.frame) as the fastest option so far, def...
Why do most C developers use define instead of const? [duplicate]
...til runtime and can only be used for automatic variables (i.e. can only be allocated on the stack).
– Bart van Ingen Schenau
Oct 27 '10 at 12:44
4
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Best way to remove from NSMutableArray while iterating?
.... That may be true (although what about the memory and processing cost of allocating a new array, and discarding the old one?) but even if it's faster it may not be as big a deal as it would be for a naive implementation, because NSArrays do not behave like "normal" arrays. They talk the talk but ...