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Is it faster to count down than it is to count up?
... (arrays of known size at compile time), the array indexing can be done as ptr + array size - loop index var, which can still be a single instruction in x86. It's pretty wild to be debugging assembler and see the loop counting down but the array indices going up!
– dthorpe
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Using arrays or std::vectors in C++, what's the performance gap?
... his answer.
If this is the case, then you can handle it by using a unique_ptr instead of a vector or, if the case is not exceptional in your codeline, actually write a class buffer_owner that will own that memory, and give you easy and safe access to it, including bonuses like resizing it (using re...
Differences between fork and exec
...s was used quite a lot (and still is) for daemons which simply listen on a TCP port and fork a copy of themselves to process a specific request while the parent goes back to listening.
Similarly, programs that know they're finished and just want to run another program don't need to fork, exec and t...
Why is it bad practice to call System.gc()?
...cations.
To show that it's possible that System.gc() does nothing, view:
http://bugs.sun.com/view_bug.do?bug_id=6668279
and in particular that there's a -XX:DisableExplicitGC VM option.
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i...
typedef struct vs struct definitions [duplicate]
... other file, you could write:
struct myStruct;
void doit(struct myStruct *ptr);
without having to have access to the definition. What I recommend is you combine your two examples:
typedef struct myStruct{
int one;
int two;
} myStruct;
This gives you the convenience of the more concise...
Can I run multiple programs in a Docker container?
...ever.
With two different containers, the two parts still communicate over TCP/IP, but unless the ports have been locked down specifically (not recommended, as you'd be unable to run more than one copy), you would have to pass the new port that the database has been exposed as to the application, so...
What is the best way to use a HashMap in C++?
...unordered_map uses a hash map in GCC stdlibc++ 6.4
This was mentioned at: https://stackoverflow.com/a/3578247/895245 but in the following answer: What data structure is inside std::map in C++? I have given further evidence of such for the GCC stdlibc++ 6.4 implementation by:
GDB step debugging in...
What are the disadvantages of using persistent connection in PDO
...
In response to Charles' problem above,
From : http://www.php.net/manual/en/mysqli.quickstart.connections.php -
A common complain about persistent connections is that their state is not reset before reuse. For example, open and unfinished transactions are not automatical...
How to make child process die after parent exits?
...ild should exit.
This isn't great, but it works, and it's easier than the TCP socket/lockfile polling solutions suggested elsewhere on this page.
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How do I trim leading/trailing whitespace in a standard way?
... ) {
char *o = d; // save orig
char *e = 0; // end space ptr.
char dtab[256] = {0};
if (!s || !d) return 0;
if (!delim) delim = " \t\n\f";
while (*delim)
dtab[*delim++] = 1;
while ( (*d = *s++) != 0 ) {
if (!dtab[0xFF & (unsigned int)*d])...