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Why it's not possible to use regex to parse HTML/XML: a formal explanation in layman's terms
...ML - what is valid in HTML, for example, isn't valid in XHTML.
Much of the free-form HTML found on the internet is not valid anyway. HTML libraries do a good job of dealing with these as well, and were tested for many of these common cases.
Very often it is impossible to match a part of the data wit...
When vectors are allocated, do they use memory on the heap or the stack?
...te the vector, i.e. the header info, on the stack, but the elements on the free store ("heap").
vector<Type> *vect = new vector<Type>;
allocates everything on the free store.
vector<Type*> vect;
will allocate the vector on the stack and a bunch of pointers on the free store, ...
FloatActionBtn 扩展：悬浮操作按钮扩展，可自定义颜色、大小、图标和位置 ...
...es (KenMorales)。
原始链接：https://community.appinventor.mit.edu/t/free-floatactionbtn/154743
文档翻译和整理：AI2中文网
最后更新：2024年12月29日
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Why does the use of 'new' cause memory leaks?
...amic storage, on the heap, which you allocate with new and are required to free yourself with delete. (this is all roughly put)
Think that you should have a delete for every object allocated with new.
EDIT
Come to think of it, object2 doesn't have to be a memory leak.
The following code is just...
Is there a max array length limit in C++?
...the type of allocator used to construct the vector because an allocator is free to manage memory any way it wants. A very odd but nontheless conceivable allocator could pool memory in such a way that identical instances of an object share resources. This way, you could insert a lot of identical obje...
How do I search an SQL Server database for a string?
... objects (e.g. tables, columns, and triggers) by name - have a look at the free Redgate Software tool called SQL Search which does this - it searches your entire database for any kind of string(s).
It's a great must-have tool for any DBA or database developer - did I already mention it's absol...
“The certificate chain was issued by an authority that is not trusted” when connecting DB in VM Role
...g Let's Encrypt to get a CA signed certificate from a known trusted CA for free, and install it on the VM. Don't forget to set it up to automatically refresh. You can read more on this topic in SQL Server books online under the topic of "Encryption Hierarchy", and "Using Encryption Without Validati...
How can I sort a List alphabetically?
...untryNames, Collator.getInstance());
Solution with a TreeSet
If you are free to decide, and if your application might get more complex, then you might change your code to use a TreeSet instead. This kind of collection sorts your entries just when they are inserted. No need to call sort().
Collec...
MySQL select one column DISTINCT, with corresponding other columns
... @Full Decent you can't, according to MySQL documentation: "The server is free to choose any value from each group, so unless they are the same, the values chosen are indeterminate.". In practice I've successfully used this kind of queries with ORDER BY clause, for instance you could add ORDER BY ...
Is it safe to delete a NULL pointer?
...However, despite these abrogations of your draconian ownership rules, lock free structures are provably more robust than lock based ones. And yes, my co-workers do indeed love me for the enhanced execution profile these structures provide and the rigorous thread safety they maintain, which allow eas...