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What uses are there for “placement new”?
...le instances of an object, and it is faster not to re-allocate memory each time you need a new instance. Instead, it might be more efficient to perform a single allocation for a chunk of memory that can hold multiple objects, even though you don't want to use all of it at once.
DevX gives a good ex...
boost多索引容器multi_index_container实战 - C/C++ - 清泛网 - 专注C/C++及内核技术
...---插入%d次-----------------\n", persons.size());
{
TIME_COUNTER_DEFAULT("Container插入");
for (Persons::iterator it = persons.begin(); it != persons.end(); ++it) {
container.insert(*it);
}
}
{
TIME_COUNTER_...
Python - Create a list with initial capacity
...esult[i]= message
return result
Results. (evaluate each function 144 times and average the duration)
simple append 0.0102
pre-allocate 0.0098
Conclusion. It barely matters.
Premature optimization is the root of all evil.
...
Delete empty lines using sed
...er although - for a quick and dirty test - I am invoking awk twice: $ time (topic companies <data.tpx | awk 'NF' - | awk -f dialog_menu.awk -) real 0m0.006s user 0m0.000s sys 0m0.008s $ time (topic companies <data.tpx | gsed '/^\s*$/d' | awk -f dialog_menu.awk ...
load scripts asynchronously
...nd .css files. I need to create a loader for my site because it takes some time to load. it will be nice if I can display the loader before importing all the:
...
Can you call Directory.GetFiles() with multiple filters?
...Glad to see it's only about twice as slow - I'll stick with it for the meantime I think.
– Dan W
Feb 17 '13 at 19:47
7
...
Is there any way to put malicious code into a regular expression?
...ng happens to be, because some of these can be detected during compilation time. Regex compilers that implement recursion usually have a built‐in recursion‐depth counter for checking non‐progression.
Russ Cox’s excellent 2007 paper on Regular Expression Matching Can Be Simple And Fast
(bu...
How can I get a JavaScript stack trace when I throw an exception?
... }
// String repeating prototype function.
if (!String.prototype.times) {
String.prototype.times = function () {
var s = this.toString(),
tempStr = "",
times = arguments[0];
if (!arguments.length)
return s;
...
How to make clang compile to llvm IR
...
Ahha. I was having a hard time finding anything in the docs about it. It is safe to assume that many flags in clang mirror gcc flag structure?
– meawoppl
Feb 28 '14 at 17:35
...
Python Requests and persistent sessions
... @SergeyNudnov Many thanks for your comment I wasted a lot of time trying to figure out why session does not handle cookies correctly. Changing domain from localhost to localhost.local solved the problem. Thanks again.
– Pulkownik
Jun 3 at 19:32
...