Sunday, July 15, 2012

field^param^local-variable -- C++ allocation

A field is always allocated memory, since a (including static) field is part of an object.

A function parameter is always allocated on the stack.

Local variables are supposed to be allocated on stack, but may not be allocated at all. Compiler can often optimize them away.

Sometimes a variable is just a token/alias in source code's symbol table. A constant variable can be replaced by the constant value at compile time.

How about initialization?
Rule 1: class instances are never uninitialized
Rule 2: static variables are never uninitialized
Rule 3: local vars and class fields are uninitialized except Rule 1.

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