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What are Aggregates and PODs and how/why are they special?
...valent to int a[3] = {1, 2, 3};
When an object of scalar type (bool, int, char, double, pointers, etc.) is value-initialized it means it is initialized with 0 for that type (false for bool, 0.0 for double, etc.). When an object of class type with a user-declared default constructor is value-initial...
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 display the function, procedure, triggers source code in postgresql?
...TRICT
AS $function$pg_reload_conf$function$
postgres=# \sf pg_encoding_to_char
CREATE OR REPLACE FUNCTION pg_catalog.pg_encoding_to_char(integer)
RETURNS name
LANGUAGE internal
STABLE STRICT
AS $function$PG_encoding_to_char$function$
...
Count the items from a IEnumerable without iterating?
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...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
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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;
...
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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Convert data.frame column format from character to factor
... the format (class) of some columns of my data.frame object ( mydf ) from charactor to factor .
6 Answers
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Why is it slower to iterate over a small string than a small list?
...string took longer than doing the same operation on a list of small single character strings. Any explanation? It's almost 1.35 times as much time.
...
How do I create a unique ID in Java? [duplicate]
...ignificantBits());
}
private static String toIDString(long i) {
char[] buf = new char[32];
int z = 64; // 1 << 6;
int cp = 32;
long b = z - 1;
do {
buf[--cp] = DIGITS66[(int)(i & b)];
i >>>= 6;
} while (i != 0);
re...
Boost.Asio的简单使用(Timer,Thread,Io_service类) - C/C++ - 清泛网 - 专注C/C++及内核技术
...I标准发送数据。)
using boost::asio::ip::tcp;
int main(int argc, char* argv[])
{
try
{
if (argc != 2)
{
std::cerr << "Usage: client <host>" << std::endl;
return 1;
}
用asio进行网络连接至少需要一个boost::asi...