WinToast | lightly library written in C++ | iOS library
kandi X-RAY | WinToast Summary
kandi X-RAY | WinToast Summary
WinToast is a lightly library written in C++ which brings a complete integration of the modern toast notifications of Windows 8 & Windows 10. Toast notifications allows your app to inform the users about relevant information and timely events that they should see and take action upon inside your app, such as a new instant message, a new friend request, breaking news, or a calendar event.
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QUESTION
I was researching in depth about C ++ header files after I often received the LNK2005
error in the Visual Studio compilation, and realized that the error was that I was declaring a variable twice, in the header file and in main.cpp, and I also found several users giving the solution how to use the extern type variable_name
; in the header file as a solution to this, and reading the answers, 3 questions came to my mind:
1st - Do you really need to use extern
to declare variables of any type in a header file? If so, why is it not used in declaring a class in a header file, for example?
2nd - Is it a good practice to use extern
in the header file? Or is there something better to use that doesn't give me the error I received above?
3rd - From what I read, the use of extern
requires that I re-declare the variable also in the .cpp file, but if it is already declared in the header file, why can't I just set its value in .cpp?
PS: Here are the reasons why I have thoroughly researched header files and generated this question here:
toast_notification.h:
...ANSWER
Answered 2020-Dec-23 at 15:01In C++ a variable declaration at namespace scope is a definition unless it is declared extern
. The extern
prevents the declaration from being a definition. You can define a variable only once within a program (unless you make it inline
). As headers are normally included in multiple translation units you’d get multiple definitions.
Note: I do not recommend to make variables inline
! The primary use of inline
“variable” definitions is for constexpr
objects. In general I advise against non-const
global data.
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