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Does Haskell require a garbage collector?
...tic memory management is necessary because manual memory management is unsafe; dynamic memory management is necessary because for some programs, the lifetime of an object can only be determined at runtime.
For example, consider the following program:
main = loop (Just [1..1000]) where
loop :: M...
Linux C/C++进程单实例互斥代码分享 - C/C++ - 清泛网 - 专注C/C++及内核技术
..._type = F_WRLCK; // 写文件锁定
fl.l_start = 0;
fl.l_whence = SEEK_SET;
fl.l_len = 0;
int ret = fcntl(fd, F_SETLK, &fl);
if (ret < 0) {
if (errno == EACCES || errno == EAGAIN) {
printf("%s already locked, error: %s\n", kPidFileName, strerror(errno));
close(fd);
exit(1);
...
c语言编程中%g是什么格式？ - C/C++ - 清泛网 - 专注C/C++及内核技术
...什么格式？%g用来输出实数，它根据数值的大小，自动选f格式或e格式（选择输出时占宽度较小的一种），且不输出无意义的0。即%g是根据结果自动选择科学...%g用来输出实数，它根据数值的大小，自动选f格式或e格式（选择输出...
Least common multiple for 3 or more numbers
How do you calculate the least common multiple of multiple numbers?
31 Answers
31
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Retrieve the commit log for a specific line in a file?
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You can get a set of commits by using pick-axe.
git log -S'the line from your file' -- path/to/your/file.txt
This will give you all of the commits that affected that text in that file. If the file was renamed at some point, you can add ...
How do I associate a Vagrant project directory with an existing VirtualBox VM?
...t is the name of the default virtual machine (if you're not using multi-VM setups).
If your VM has somehow become disassociated, what you can do is do VBoxManage list vms which will list every VM that VirtualBox knows about by its name and UUID. Then manually create a .vagrant file in the same dir...
List comprehension vs map
Is there a reason to prefer using map() over list comprehension or vice versa? Is either of them generally more efficient or considered generally more pythonic than the other?
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What is “lifting” in Haskell?
...nction into a corresponding function within another (usually more general) setting
take a look at http://haskell.org/haskellwiki/Lifting
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What are Scala context and view bounds?
... editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
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What is the best way to ensure only one instance of a Bash script is running? [duplicate]
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Use the set -o noclobber option and attempt to overwrite a common file.
A short example
if ! (set -o noclobber ; echo > /tmp/global.lock) ; then
exit 1 # the global.lock already exists
fi
# ... remainder of script ...
A lo...