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Overloading of “&” operator

functions used from Y2018-Text-Core-Str:
function "&"(left:CFix;right:String) return CFix ;
function "&"(left:CFix;right:Character) return CFix ;
function "&"(left:String;right:CFix) return String ;
function "&"(left:String;right:CVar) return String ;
function "&"(left:String;right:CodePoint) return String ;
function "&"(left:CVar;right:String) return CVar ;
function "&"(left:CVar;right:Character) return CVar ;
function "&"(left:CodePoint;right:String) return CFix ;
function "&"(left:CodePoint;right:Character) return CFix ;
function "&"(left:Character;right:CFix) return String ;
function "&"(left:Character;right:CVar) return String ;
function "&"(left:Character;right:CodePoint) return String ;

functions used from Y2018-Text-Core-CVarpack:

function "&"(Left:CFix;Right:CVar) return CFix ;
function "&"(Left:CVar;Right:CFix) return CVar ;
function "&"(Left:CVar;Right:CVar) return CVar ;
function "&"(Left:CVar;Right:CodePoint) return CVar ;
function "&"(Left:CodePoint;Right:CVar) return CFix ;

Some are supported through package Y2018-Text-Core-Str and Y2018-Text-Core-CVarpack and some by basic Ada.

First or left	Second or right	Result
CFix	CFix	CFix
CFix	CVar	CFix
CFix	String	CFix
CFix	CodePoint	CFix
CFix	Character	CFix
String	CFix	String
String	CVar	String
String	String	String
String	CodePoint	String
String	Character	String
CVar	CFix	CVar
CVar	CVar	CVar
CVar	String	CVar
CVar	CodePoint	CVar
CVar	Character	CVar
CodePoint	CFix	CFix
CodePoint	CVar	CFix
CodePoint	String	CFix
CodePoint	CodePoint	CFix
CodePoint	Character	CFix
Character	CFix	String
Character	CVar	String
Character	String	String
Character	CodePoint	String
Character	Character	String

The result is always one of String, CFix or CVar type.
Example:
declare a:CFix:=a_cfix & b_cvar & "5";
i.e. mixing CVar, CFix and String values and assign the result to variable 'a' of type of CFix type.
The type of such a mixed expression is defined by the first operator, in this case 'a_CFix'. It is possible to set the type of an expression by inserting at the beginning a null length constant ("" for String, null_CFix or ""c for CFix and null_CVar for CVar ).