• Source: Scope resolution operator

In computer programming, scope is an enclosing context where values and expressions are associated. The scope resolution operator helps to identify and specify the context to which an identifier refers, particularly by specifying a namespace or class. The specific uses vary across different programming languages with the notions of scoping. In many languages, the scope resolution operator is written ::.
In some languages, notably those influenced by Modula-3 (including Python and Go), modules are objects, and scope resolution within modules is a special case of usual object member access, so the usual method operator . is used for scope resolution. Other languages, notably C++ and Ruby, feature both scope resolution and method access, which interact in various ways; see examples below.




C++






PHP


In PHP, the scope resolution operator is also called Paamayim Nekudotayim (Hebrew: פעמיים נקודותיים, pronounced [paʔaˈmajim nekudoˈtajim], the second word a colloquial corruption of נקודתיים, pronounced [nekudaˈtajim]), which means “double colon” in Hebrew.
The name "Paamayim Nekudotayim" was introduced in the Israeli-developed Zend Engine 0.5 used in PHP 3. Initially the error message simply used the internal token name for the ::, T_PAAMAYIM_NEKUDOTAYIM causing confusion for non-Hebrew speakers. This was clarified in PHP 5.4 as below.

As of PHP 8, the Hebrew name has been removed from the error message




Ruby


In Ruby, scope resolution can be specified using the module keyword.

Scope is also affected by sigils which preface variable names:

"$" - global variable
"@" - instance variable of self
"@@" - class variable
No sigil, lowercase or underscore - local variable or method
No sigil, uppercase - constant




References






External links


Bjarne Stroustrup's C++ Glossary

Kata Kunci Pencarian:

• Negara Islam Irak dan Syam
• React.js
• Scope resolution operator
• Operator (computer programming)
• Double colon
• Operators in C and C++
• Colon (punctuation)
• Scope (computer science)
• Method overriding
• Ch (computer programming)
• Borel functional calculus
• Function overloading