Name binding

• Static binding (or early binding) is name binding performed before the program is run.[2]
• Dynamic binding (or late binding or virtual binding) is name binding performed as the program is running.[2]

An example of a static binding is a direct C function call: the function referenced by the identifier cannot change at runtime.

An example of dynamic binding is dynamic dispatch, as in a C++ virtual method call. Since the specific type of a polymorphic object is not known before runtime (in general), the executed function is dynamically bound. Take, for example, the following Java code:

public void foo(java.util.List<String> list) {
    list.add("bar");
}

List is an interface, so list must refer to a subtype of it. list may reference a LinkedList, an ArrayList, or some other subtype of List. The method referenced by add is not known until runtime. In C, which does not have dynamic binding, a similar goal may be achieved by a call to a function pointed to by a variable or expression of a function pointer type, whose value is unknown until it is evaluated at run-time.

Rebinding should not be confused with mutation or assignment.

• Rebinding is a change to the referencing identifier.
• Assignment is a change to (the referenced) variable.
• Mutation is a change to an object in memory, possibly referenced by a variable or bound to an identifier.

Consider the following Java code:

LinkedList<String> list;
list = new LinkedList<String>();
list.add("foo");
list = null;
{ LinkedList<Integer> list = new LinkedList<Integer>(); list.add(Integer(2)); }

The identifier list is bound to a variable in the first line; in the second, a reference an object (a linked list of strings) is assigned to the variable. The linked list referenced by the variable is then mutated, adding a string to the list. Next, the variable is assigned the constant null. In the last line, the identifier is rebound for the scope of the block. Operations within the block access a new variable and not the variable previously bound to list.

Late static binding is a variant of binding somewhere between static and dynamic binding. Consider the following PHP example:

class A
{
    public static $word = "hello";
    public static function hello() { print self::$word; }
}

class B extends A
{
    public static $word = "bye";
}

B::hello();

In this example, the PHP interpreter binds the keyword self inside A::hello() to class A, and so the call to B::hello() produces the string "hello". If the semantics of self::$word had been based on late static binding, then the result would have been "bye".

Beginning with PHP version 5.3, late static binding is supported.[3] Specifically, if self::$word in the above were changed to static::$word as shown in the following block, where the keyword static would only be bound at runtime, then the result of the call to B::hello() would be "bye":

class A
{
    public static $word = "hello";
    public static function hello() { print static::$word; }
}

class B extends A
{
    public static $word = "bye";
}

B::hello();

• Late binding
• Branch table method of applying name binding via branch table or function pointers
• Dynamic dispatch
• Higher-order abstract syntax (HOAS)