大约有 42,000 项符合查询结果（耗时：0.0345秒） [XML]
What is a method group in C#?
...
You can cast a method group into a delegate.
The delegate signature selects 1 method out of the group.
This example picks the ToString() overload which takes a string parameter:
Func<string,string> fn = 123.ToString;
Console...
Why exactly is eval evil?
...nic or other)
pointers
restartable exceptions
self-modifying code
...and a cast of thousands.
If you find yourself having to use any of these powerful, potentially dangerous tools ask yourself three times "why?" in a chain. For example:
"Why do I have to use eval?"
"Because of foo." "Why ...
What's the meaning of interface{}?
...mment by @NickCraig-Wood. interface{} can point to anything and you need a cast/type assertion to use it.
package main
import (
. "fmt"
"strconv"
)
var c = cat("Fish")
var d = dog("Bone")
func main() {
var i interface{} = c
switch i.(type) {
case cat:
c.Eat() // Fish...
Is there an equivalent to CTRL+C in IPython Notebook in Firefox to break cells that are running?
I've started to use the IPython Notebook and am enjoying it. Sometimes, I write buggy code that takes massive memory requirements or has an infinite loop. I find the "interrupt kernel" option sluggish or unreliable, and sometimes I have to restart the kernel, losing everything in memory.
...
Do NSUserDefaults persist through an Update to an app in the Appstore?
...such as preferences, dates, strings etc. If you are looking to save images and files, the file system is a better bet.
share
|
improve this answer
|
follow
|
...
How to check if a database exists in SQL Server?
...8))
RETURNS bit
AS
BEGIN
declare @result bit = 0
SELECT @result = CAST(
CASE WHEN db_id(@dbname) is not null THEN 1
ELSE 0
END
AS BIT)
return @result
END
GO
Now you can use it like this:
select [dbo].[DatabaseExists]('master') --returns 1
select [dbo].[...
Concatenate two string literals
...ncatenate a std::string object with a literal it will make the appropriate casting for the literal.
But if you try to concatenate two literals, the compiler won't be able to find an operator that takes two literals.
share
...
How to compare two colors for similarity/difference
...t;/b> pctDiffRed = diffRed / 255; is going to give you 0 unless you cast to a float somewhere. <b>2</b> You'll need to multiply by 100 somewhere to get a percentage.
– vaughandroid
Jan 26 '12 at 12:34
...
What does 'const static' mean in C and C++?
...e you saying const declaration implies static there as well? As in, if you cast const away, and modify the value, all values will be modified?
– Cookie
Mar 26 '14 at 20:44
1
...
How to speed up insertion performance in PostgreSQL
...h statement using SQLSetConnectAttr(conn, SQL_ATTR_AUTOCOMMIT, reinterpret_cast<SQLPOINTER>(SQL_AUTOCOMMIT_OFF), 0);
Once all rows have been inserted, commit the transaction using SQLEndTran(SQL_HANDLE_DBC, conn, SQL_COMMIT);. There is no need to explicitly open a transaction.
Unfortunately,...