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- How do I use extern to share variables between source files?
A variable definition is also a declaration, but not all variable declarations are definitions Best way to declare and define global variables The clean, reliable way to declare and define global variables is to use a header file to contain an extern declaration of the variable
- c - Multiple definition of a global variable - Stack Overflow
So, in your code you created multiple definitions of an object DEFAULT_DSM_CONFIG with external linkage - a clear violation of definition rules of C language Either declare your object as static const (if you don't mind having multiple objects with internal linkage) or remove the definition from the header file (leave only a non-defining
- c++ - What happens to global and static variables in a shared library . . .
You would need to provide an object file (or static library) with a definition of that extern variable and link it statically with both the executable and the DLL, resulting in two distinct global variables (one belonging to the executable and one belonging to the DLL)
- Global variables in header file - Stack Overflow
15 You should not define global variables in header files You can declare them as extern in header file and define them in a c source file (Note: In C, int i; is a tentative definition, it allocates storage for the variable (= is a definition) if there is no other definition found for that variable in the translation unit )
- Global variables in Java - Stack Overflow
The problem with creating "global variables" is that it's not industry standard for Java It's not industry standard because it allows multiple classes to manipulate data asyncronized, if you're running a multi-threaded application, this gets a little more complicated and dangerous in terms of thread-safety
- How to declare a global variable in Python correctly
How to declare global variables in a correct way in Python? What I'm doing wrong? I expected the code of tic-tac-toe working correctly but it didn't To resolve the issue I tried to change "player" scope and moved an assignment inside greet () method before infinite loop
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