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How to retrieve a user environment variable in CMake (Windows)
...Name="Hello World" cmake ..
env [--unset=NAME]... [NAME=VALUE]... COMMAND [ARG]...
Run command in a modified environment.
Just be aware that this may only work the first time. If CMake re-configures with one of the consecutive builds (you just call e.g. make, one CMakeLists.txt was cha...
Android - Center TextView Horizontally in LinearLayout
...rLayout it is already in the horizontal center of the layout. When you use android:layout_gravity it places the widget, as a whole, in the gravity specified. Instead of placing the whole widget center what you're really trying to do is place the content in the center which can be accomplished with a...
How to find out what type of a Mat object is with Mat::type() in OpenCV
...
Here is a handy function you can use to help with identifying your opencv matrices at runtime. I find it useful for debugging, at least.
string type2str(int type) {
string r;
uchar depth = type & CV_MAT_DEPTH_MASK;
uchar cha...
C++应用程序添加VBScript和JavaScript支持 - C/C++ - 清泛网 - 专注IT技能提升
C++应用程序添加VBScript和JavaScript支持Adding-VBScript-and-JavaScript-support-in-Cpp-applC++ VBScript JavaScript 支持采用MSSCRIPT.OCX在C++程序中调用JavaScript及VBScript。效果截图：
源码点此下载。
Introduction
I am always amazed to see how the script control (m...
C++应用程序添加VBScript和JavaScript支持 - C/C++ - 清泛网 - 专注IT技能提升
C++应用程序添加VBScript和JavaScript支持Adding-VBScript-and-JavaScript-support-in-Cpp-applC++ VBScript JavaScript 支持采用MSSCRIPT.OCX在C++程序中调用JavaScript及VBScript。效果截图：
源码点此下载。
Introduction
I am always amazed to see how the script control (m...
C++应用程序添加VBScript和JavaScript支持 - C/C++ - 清泛网 - 专注IT技能提升
C++应用程序添加VBScript和JavaScript支持Adding-VBScript-and-JavaScript-support-in-Cpp-applC++ VBScript JavaScript 支持采用MSSCRIPT.OCX在C++程序中调用JavaScript及VBScript。效果截图：
源码点此下载。
Introduction
I am always amazed to see how the script control (m...
C++应用程序添加VBScript和JavaScript支持 - C/C++ - 清泛网 - 专注IT技能提升
C++应用程序添加VBScript和JavaScript支持Adding-VBScript-and-JavaScript-support-in-Cpp-applC++ VBScript JavaScript 支持采用MSSCRIPT.OCX在C++程序中调用JavaScript及VBScript。效果截图：
源码点此下载。
Introduction
I am always amazed to see how the script control (m...
C++应用程序添加VBScript和JavaScript支持 - C/C++ - 清泛网 - 专注IT技能提升
C++应用程序添加VBScript和JavaScript支持Adding-VBScript-and-JavaScript-support-in-Cpp-applC++ VBScript JavaScript 支持采用MSSCRIPT.OCX在C++程序中调用JavaScript及VBScript。效果截图：
源码点此下载。
Introduction
I am always amazed to see how the script control (m...
What is a good pattern for using a Global Mutex in C#?
The Mutex class is very misunderstood, and Global mutexes even more so.
8 Answers
8
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Cannot pass null argument when using type hinting
...on Type $t = null whereas if you need to make an argument accept both null and its type, you can follow above example.
You can read more here.
PHP 7.0 or older
You have to add a default value like
function foo(Type $t = null) {
}
That way, you can pass it a null value.
This is documented i...