Tuesday, August 23, 2011

what static means for a c++ object

I feel "static" has too many overloaded meanings, almost unrelated. (Java is better.) Maybe there are just 3 mutually exclusive meanings

1) as inherited from C, static local var retain their values between function calls. My Chartered system relied heavily on these.

2) another meaning is the java meaning.

3) file scope. We know local variables (block scope) and global variables (program scope). There is one other level of scoping for variables -- file scope. A variable with file scope can be accessed by any function or block within a single file. To declare a file scoped variable, simply declare a variable outside of a block
(same as a global variable) but use the static keyword.

Note all of these 3 types are about "objects", rather than "variables". There's a technical jargon -- non-local static object, sometimes IMPLICITLY static. See [[effC++]] P221. 

Are all these objects allocated at compile time not dynamically at run time. How about auto variables?

How about static_cast? Irrelevant to this discussion. Nothing to do object type

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