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Count the items from a IEnumerable without iterating?
...
...in cases where things like Enumerable.Concat are used to combine a large collection which knows a lot about itself with a small one that doesn't.
– supercat
Feb 19 '15 at 20:16
...
Is a colon `:` safe for friendly-URL use?
...pretty fresh in my mind.
http://site/gwturl#user:45/comments
All the characters in the fragment part (user:45/comments) are perfectly legal for RFC 3986 URIs.
The relevant parts of the ABNF:
fragment = *( pchar / "/" / "?" )
pchar = unreserved / pct-encoded / sub-delims / ":" / ...
Inno Setup for Windows service?
...ystem.Environment.UserInteractive)
{
string parameter = string.Concat(args);
switch (parameter)
{
case "--install":
ManagedInstallerClass.InstallHelper(new string[] { Assembly.GetExecutingAssembly().Location });
break;
...
Java multiline string
...
Furthermore, the first version will be automatically concatenated by the compiler, since all the strings are known at compile time. Even if the strings are not known at compile time, it's no slower than StringBuilder or String.format(). The only reason to avoid concatenation wi...
How to get ID of the last updated row in MySQL?
...E footable
SET foo = 'bar'
WHERE fooid > 5
AND ( SELECT @uids := CONCAT_WS(',', fooid, @uids) );
SELECT @uids;
This will return a string with all the IDs concatenated by a comma.
share
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C++及Windows异常处理(try，catch; __try,__finally, __except) - C/C++ - ...
...ss File_handle {
FILE* p;
public:
File_handle(const char* n, const char* a)
{ p = fopen(n,a); if (p==0) throw Open_error(errno); }
File_handle(FILE* pp)
{ p = pp; if (p==0) throw Open_error(errno); }
~File_handle() { fclose(p); }
...
Java: Difference between PrintStream and PrintWriter
...ce being a OutputStream is a stream of bytes while a Writer is a stream of characters.
If an OutputStream deals with bytes, what about PrintStream.print(String)? It converts chars to bytes using the default platform encoding. Using the default encoding is generally a bad thing since it can lead to...
Unicode Processing in C++
...emplate codecvt" - discusses the codecvt class used for converting between character encodings (including UTF-8, UTF-16 and UTF-32). There is more about Unicode support peppered throughout the document, but these seem to be the most critical sections on the subject.
– eestra...
初窥InnoDB的Memcached插件 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...------+---------------------+------+-----+---------+-------+
| c1 | varchar(32) | NO | PRI | | |
| c2 | varchar(1024) | YES | | NULL | |
| c3 | int(11) | YES | | NULL | |
| c4 | bigint(20) unsigned | YES | | N...
What is the curiously recurring template pattern (CRTP)?
...ter
{
public:
Writer() { }
~Writer() { }
void write(const char* str) const
{
static_cast<const T*>(this)->writeImpl(str); //here the magic is!!!
}
};
class FileWriter : public Writer<FileWriter>
{
public:
FileWriter(FILE* aFile) { mFile = aFile; ...