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Build docker image from multiple build contexts

Build docker image from multiple build contexts Building a docker image requires specifying a source of truth to include in the image from a local directory or a remote git repository. In the previous version, the docker BuildKit allows users to specify the build context from a single source of truth only. However, the engineers may need to have the context from different locations based on the type of files. For instance, icons, images or other resources that are not included in the same package, including the resource from other docker images. Fortunately, the Docker Buildx toolkit supports multiple build context flag for Docker 1.4. Let's learn how to use this new feature. The following list is a shortcut for jumping into a specific topic handy. What version of Docker is this tutorial targeting? How to specify the version of Dockerfile frontend? Ho
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[C++]在Class內宣告靜態float常數

一般對compiler而言，要宣告class內的靜態常數，只能宣告成int的形態。

如果要宣告成
 static const float STATIC_FLOAT = 1.F;

則Compiler會出現「a member of type "const float" cannot have a in-class initializer」

因此，如想要在class內宣告靜態的float，則需先在class內宣告個靜態的float，但不給予值。並在*.cpp給定此常數值即可：

*.h
 class CTestClass  
 {  
  static cosnt float STATIC_FLOAT;  
  ...  
  ...  
 }  

*.cpp
 const flaot CTestClass::STATIC_FLOAT = 1.F;

參考連結:static const float in C++. why not?
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