Covering C++ interviews questions on const, initialization list, global variables, and static

(Last Updated On: May 18, 2010)

Covering C++ interviews questions on const, initialization list, global variables, and static
Note that non static const data members and reference data members cannot assign values. You would need to have these initialized in the initialization list.

Initialization lists can be listed as private after the constructor definition.
class Baz
Baz() : _foo( “initialize foo first” ), _bar( “then bar” ) { }

std::string _foo;
std::string _bar;

In order to access non static members of a class from a static method, you need to declare a class instance inside the static instance. A static method can only use in class’s role is to use static members only. Static methods can be accessed by non static and static data members. Static methods cannot be volatile, constant, or virtual. Also for example, for app.cpp or app.c:
static void print_some_data()
is limited in abc.cpp/c only, no other compilation unit in an application can use it.

A common use for static to keep track the number of instances of a class.
Static member functions are used to access private static data member and they do not have a this pointer. They can only access static data members as they are not attached to instances of objects.
To access static member of a class, use ::
In short:
1. Within a function, there is one copy of the variable that retains its value even when the function returns.
2. Within a class, all objects share the static variable and the static variable is accessed using the class name.
3. In the global scope a static variable is local to the current file.


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