File: docs/TernaryNullCoalesceMgr.md

[comment]: # (This file is part of PcGen, PHP Code Generation support package. Copyright 2020 Kjell-Inge Gustafsson, kigkonsult, All rights reserved, licence GPL 3.0)

TernaryNullCoalesceMgr

The `TernaryNullCoalesceMgr` class manages

* The ternary operator expression 'expr1 ? expr2 : expr3' evaluates to expr2 if expr1 evaluates to TRUE and expr3 if expr1 evaluates to FALSE. * The ternary operator expression 'expr1 ?: expr3'

returns expr1 if expr1 evaluates to TRUE and expr3 otherwise.

* The (PHP7+) null coalescing operator expression 'expr1 ?? expr2'

evaluates to expr2 if expr1 is NULL, and expr1 otherwise.

In particular, this operator does not emit a notice if the left-hand side value does not exist, just like isset(). This is especially useful on array keys.

* Expression defind as one of simple expression i.e. constant, variable or class property (array) method/function invoke, opt with arguments, no support for dynamic methodNames, $this->{$method}

• used by [AssignClauseMgr] and [ReturnClauseMgr]
• The result expression is enclosed in parenthesis.

TernaryNullCoalesceMgr Methods

Inherited [Common methods]

* ```expr1``` _string_|[EntityMgr]|[FcnInvokeMgr] 
* ```expr2``` _string_|[EntityMgr]|[FcnInvokeMgr] 
* ```expr3``` _string_|[EntityMgr]|[FcnInvokeMgr] 
* Return _static_
* Throws _InvalidArgumentException_

---

• Return _array_, result code rows (null-bytes removed) no trailing eol
• Throws _RuntimeException_

* Return _string_ with code rows (extends toArray), each code row with trailing eol
* Throws _RuntimeException_

---

• Return _static_

* Return [EntityMgr]|[FcnInvokeMgr]

* Return [EntityMgr]|[FcnInvokeMgr]

* Return [EntityMgr]|[FcnInvokeMgr]

TernaryNullCoalesceMgr::factory( 'var1', 'var2', 'var3' )->toString(); 

Example : 

Result : 

TernaryNullCoalesceMgr::factory( 'var1', 'var2' )
    ->setTernaryOperator( false )
    ->toString(); 

---

<small>Return to [README] - [Summary]</small>

[AssignClauseMgr]:AssignClauseMgr.md
[EntityMgr]:EntityMgr.md
[Common methods]:CommonMethods.md
[FcnInvokeMgr]:FcnInvokeMgr.md
[README]:../README.md
[ReturnClauseMgr]:ReturnClauseMgr.md
[Summary]:Summary.md