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My question is about when a function should be referenced with the extern keyword in C. I am failing to see when this should be used in practice. As I am writing a program all of the functions tha...
Context Explanation
How to correctly use the extern keyword in C - Stack Overflow Using extern is only of relevance when the program you're building consists of multiple source files linked together, where some of the variables defined, for example, in source file file1.c need to be referenced in other source files, such as file2.c. It is important to understand the difference between defining a variable and declaring a variable: A variable is declared when the compiler is ... The extern keyword takes on different forms depending on the environment. If a declaration is available, the extern keyword takes the linkage as that specified earlier in the translation unit.
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extern "C" makes a function-name in C++ have C linkage (compiler does not mangle the name) so that client C code can link to (use) your function using a C compatible header file that contains just the declaration of your function. Your function definition is contained in a binary format (that was compiled by your C++ compiler) that the client C linker will then link to using the C name. Since ... What is the effect of extern "C" in C++? - Stack Overflow Extern The extern keyword denotes, that “this identifier is declared here, but is defined elsewhere”.
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In other words, you tell the compiler that some variable will be available, but its memory is allocated somewhere else. The thing is, where? Let’s have a look at the difference between declaration and definition of some object first. I'm reading "Think in C++" and it just introduced the extern declaration. For example: extern int x; extern float y; I think I understand the meaning (declaration without definition), but I wonde...