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C++ - passing references to std::shared_ptr or boost::shared_ptr
...a message somewhere. It may be a large message so rather than using a std::string that likely gets copied as it is passed around to multiple places, we use a shared_ptr to a string:
void send_message(std::shared_ptr<std::string> msg)
{
std::cout << (*msg.get()) << std::endl;
}...
SQL ON DELETE CASCADE, Which Way Does the Deletion Occur?
...ould restructure your schema into this,
CREATE TABLE Categories
(
Code CHAR(4) NOT NULL PRIMARY KEY,
CategoryName VARCHAR(63) NOT NULL UNIQUE
);
CREATE TABLE Courses
(
CourseID INT NOT NULL PRIMARY KEY,
BookID INT NOT NULL,
CatCode CHAR(4) NOT NULL,
CourseNum CHAR(3) NOT NULL,
Cour...
When to use static classes in C# [duplicate]
...ery cheap operation in most languages, so speed is not an issue. Adding an extra line of code to the consumer is a low cost for laying the foundation of a much more maintainable solution in the future. And finally, if you want to avoid creating instances, simply create a singleton wrapper of your cl...
Swift Beta performance: sorting arrays
...sing namespace std;
using namespace std::chrono;
int main(int argc, const char * argv[]) {
const auto arraySize = 10000000;
vector<uint32_t> randomNumbers;
for (int i = 0; i < arraySize; ++i) {
randomNumbers.emplace_back(arc4random_uniform(arraySize));
}
const...
Can I change the checkbox size using CSS?
...xt size
You can control the aspect, the color, the size of the checkbox
No extra HTML needed !
Only 3 lines of CSS needed (the last one is just to give you ideas)
Edit:
As pointed out in the comment, the checkbox won't be accessible by key navigation. You should probably add tabindex=0 as a proper...
How can I listen for a click-and-hold in jQuery?
...our plugin wasn't written for Bootstrap, but works VERY nicely with it! No extra CSS or messing around. Just works. Kudos.
– Andy
Oct 24 '18 at 20:53
add a comment
...
mongodb: insert if not exists
...u want to do an "upsert". MongoDB has built-in support for this. Pass an extra parameter to your update() call: {upsert:true}. For example:
key = {'key':'value'}
data = {'key2':'value2', 'key3':'value3'};
coll.update(key, data, upsert=True); #In python upsert must be passed as a keyword argumen...
How can I run a PHP script in the background after a form is submitted?
...y notification process that happens (or doesn't). (shell_exec returns as a string and this was easier than using exec, assigning the output to a variable and then opening a file to write to.)
I'm using the following line to invoke the email script:
shell_exec("/path/to/php /path/to/send_notificati...
Best practice for Django project working directory structure
...s.py
templatetags/
__init__.py
templatetag_extras.py
gulpfile.js
manage.py
requirements.txt
I think this:
settings.py
settings_dev.py
settings_production.py
is better than this:
settings/__init__.py
settings/base.py
settings/d...
使用NPAPI编写浏览器插件的源码实例(windows 7/linux) - C/C++ - 清泛网 - ...
...tp://code.google.com/p/npapi-headers/
plugin_exec.c中的一些函数
char* NP_GetMIMEDescription()
return的字符串的格式必须是:"text/html:htm,html:HTML Document;application/x-texinfo:tex,texi,texinfo:TexInfo Document;"
详情请看[3]
NPError NP_GetValue (void *future,
NPP...