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Why is it impossible to build a compiler that can determine if a C++ function will change the value
...ange the variable (or halt) for every possible function.
Here's an easy example:
void foo() {
if (bar() == 0) this->a = 1;
}
How can a compiler determine, just from looking at that code, whether foo will ever change a? Whether it does or doesn't depends on conditions external to the funct...
Resetting a setTimeout
...imer = window.setTimeout(function() {
window.location.href = 'file.php';
}, 115000);
}
function onClick() {
clearTimeout(g_timer);
startTimer();
}
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Which C++ idioms are deprecated in C++11?
...g reference qualifiers for functions. Such as in the above case defining A& operator=(A o)& instead of A& operator=(A o). These prevent the silly mistakes and make classes behave more like basic types and do not prevent move semantics.
– Joe
Jun 3 '...
Windows can't find the file on subprocess.call()
...
I met the same issue while I was calling a PHP. The reason is PHP isn't in PATH so the command PHP was not found. But PowerShell found it does exist in the current location and it suggests replacing the 'PHP' by the '.\PHP' if I trust this command. Then it runs well.
...
Shell script to send email [duplicate]
...ile -bi -)
Content-Transfer-Encoding: 7bit
${MSG}
$(test $NB_FILES -eq 0 && echo "--frontier--" || echo "--frontier")
$(for file in ${FILES} ; do
let NB=${NB}+1
FILE_NAME="$(basename $file)"
echo "Content-Type: $(file -bi $file); name=\"${FILE_NAME}\""
echo "...
How do I use the nohup command without getting nohup.out?
...v/null - that's where it goes instead.
nohup command >/dev/null 2>&1 # doesn't create nohup.out
If you're using nohup, that probably means you want to run the command in the background by putting another & on the end of the whole thing:
nohup command >/dev/null 2>&1 &...
How do I capture the output of a script if it is being ran by the task scheduler?
..."path with spaces/command.cmd > file.txt" if you have spaces. The 2>&1 from Ivan's answer also goes inside the quotes.
– Dinei
May 24 '17 at 15:54
3
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Compare given date with today
...
for php 4 quit the last '.0' from $var = "2010-01-21 00:00:00.0", otherwise strtotime will return -1
– javier_domenech
Dec 19 '14 at 16:03
...
Timer function to provide time in nano seconds using C++
....h>
int main()
{
timespec ts;
// clock_gettime(CLOCK_MONOTONIC, &ts); // Works on FreeBSD
clock_gettime(CLOCK_REALTIME, &ts); // Works on Linux
}
For windows you want to use the QueryPerformanceCounter. And here is more on QPC
Apparently there is a known issue with QPC on som...
What is your favorite C programming trick? [closed]
For example, I recently came across this in the linux kernel:
37 Answers
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