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often in headers I see
//global namespace, not in class
static const int my_global =1984;
but recently I learned that const implies internal linkage, so I wonder doesnt that make static unnecessary?
It depends. In C++, it’s unnecessary, but some people (myself included) like to put it in, on the grounds of saying what we mean. And of course, if the header is to be used in C as well, it is necessary (but for many uses in C, you’ll need a
#define).