ultraviewer manipulatepacket error : 1 :object variable or with block variable not set

So, the 'const int a = 10' becomes 'static const int a = 10'. In other words, C++ treats a global const definition as if the static had been used as in the following code. While a global variable has external linkage by default, a const global has internal linkage by default. The const in C++ has gives a little bit of twist to the default storage classes.

Int zz = 10 * x // not allowed, x is not constant

A static variable can be initialized only with a constant expression.

An uninitialized static variable set to 0.

But a can be used in other files because it has external linkage.Īll static duration variables have the following initialization characteristics: By saying that c is static, we are saying that we want to allocate it once, and only once, at some point before the first time that f() is called, and that we do not want to deallocate it as long as our program runs.īoth a and b can be accessed from the point of declaration until the end of the file. But c remains in memory even when the f() function is not being executed.

The variable d has local scope and no linkage - it's no use outside of f(). Here is an example of static variables with different duration.Īll the static variables persist until program terminates. Since the static variables stay the same throughout the life cycle of the program, they are easy to deal with for the memory system and they are allocated in a fixed block of memory. These variables can be classified as three groups in terms of linkage: They persist for the entire running time of a program. Variables defined outside a function or by using the keyword static have static storage duration.

C functions declared static within a module may only be called by otherįunctions within that module (file scope).

Static member functions can only operate on the static data members. Non-static member functions can access all data members of the class: static and non-static. There is only a single instance of each static data member for the entire class.

static members exist as members of the class rather than as an instance in each object of the class.

It is not accessible by functions from other modules. Is accessible by all functions within that module.

A variable declared static within a module (but outside the body of a function).

Maintains its value between invocations of the function.

A variable declared static within the body of a function.

Most of the candidates get the first one, and some with the second, third, and may be 4th ones as well. This is one of the frequently asked questions during the interview.

Ultraviewer manipulatepacket error : 1 :object variable or with block variable not set