This means you save 9 constants worth of memory. It means that once you execute a program, its global variable will be available for use throughout the running of the entire program. friction or gravity coefficients). except if the program starts a thread before a variable is initialized, in which case its initialization is unsequenced, // dynamically initialized to 0.0 if d1 is dynamically initialized, or, // dynamically initialized to 1.0 if d1 is statically initialized, or, // statically initialized to 0.0 (because that would be its value, // if both variables were dynamically initialized), // may be initialized statically or dynamically to 1.0, // If a is initialized before main is entered, b may still be uninitialized, // at the point where A::A() uses it (because dynamic initialization is, // indeterminately sequenced across translation units), // If a is initialized at some point after the first statement of main (which odr-uses. Given that writing X const xis such a natural thing to do (another hat tip to the const Westerners), you may doubt that such problems could appear. In a programming language, each variable has a particular scope attached to them. for the extern global_foo part it's basically the global_foo variable from file foo.c that is being called to the file example.h. There are three kinds of linkage: external, internal, and none. C question: Why would one put 'static' variables in a header? If the initialization of an inline variable is deferred, it happens before the first odr-use of that specific variable. cat, you're right, I'll re-word it a little. Given the above downsides, prefer defining your constants in a header file (either per the prior section, or per the next section). Because const globals have internal linkage, each .cpp file gets an independent version of the global variable that the linker cant see. Canadian of Polish descent travel to Poland with Canadian passport. Variables to be zero-initialized are placed in the. Is "I didn't think it was serious" usually a good defence against "duty to rescue"? But I still don't see why having static definitions in header
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