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'is' versus try cast with null check
...eds to be cast a second time
// before using it as a MyType
...
}
to this:
var myObjRef = myObj.myProp as MyType; // only one cast
if (myObjRef != null)
{
// myObjRef is already MyType and doesn't need to be cast again
...
}
C# 7.0 supports...
Capturing Groups From a Grep RegEx
...'t even have to use grep:
files="*.jpg"
regex="[0-9]+_([a-z]+)_[0-9a-z]*"
for f in $files # unquoted in order to allow the glob to expand
do
if [[ $f =~ $regex ]]
then
name="${BASH_REMATCH[1]}"
echo "${name}.jpg" # concatenate strings
name="${name}.jpg" # sa...
Priority queue in .Net [closed]
I am looking for a .NET implementation of a priority queue or heap data structure
14 Answers
...
What is your favorite C programming trick? [closed]
For example, I recently came across this in the linux kernel:
37 Answers
37
...
C# operator overload for `+=`?
I am trying to do operator overloads for += , but I can't. I can only make an operator overload for + .
10 Answers
...
Check if $_POST exists
... As per Shi's comment on Augustus Francis's answer, empty() is not correct for choice #1, because in php, the string '0' is equivalent to false - and empty() returns true for all values equivalent to false. So using empty, the code would skip printing if the value was '0'. If you want to exclude the...
Get Root Directory Path of a PHP project
...
For PHP >= 5.3.0 try
PHP magic constants.
__DIR__
And make your path relative.
For PHP < 5.3.0 try
dirname(__FILE__)
share
|
...
How to change a module variable from another module?
... change that.
This is one of the dangers of using the from foo import bar form of the import statement: it splits bar into two symbols, one visible globally from within foo which starts off pointing to the original value and a different symbol visible in the scope where the import statement is exec...
Python Logging (function name, file name, line number) using a single file
I am trying to learn how an application works. And for this I am inserting debug commands as the first line of each function's body with the goal of logging the function's name as well as the line number (within the code) where I send a message to the log output. Finally, since this application comp...
C++使用OLE/COM高速读写EXCEL的源码 - C/C++ - 清泛网 - 专注C/C++及内核技术
...ication.14")//Excel 2010
};
CLSID clsid;
HRESULT hr = S_FALSE;
for (int i= sizeof(ptchsExcel)/sizeof(*ptchsExcel)-1;i>=0;i--)
{
#if 0
if (m_app.CreateDispatch(ptchsExcel[i],NULL))
{
break;
}
等同于下面的操作
#else
hr = CLSIDFromProgID(ptchsExcel[i], &c...