Alternative operator representations
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C + + (und C) Quellcode kann in jedem Nicht-ASCII-7-Bit-Zeichensatz, der ISO 646/ECMA-6 invarianten Zeichensatz enthält geschrieben werden. Jedoch mehrere C + + Betreiber und Interpunktionszeichen erfordern Zeichen, die außerhalb des ISO 646 Codesatz sind:
{, }, [, ], #, \, ^, |, ~. Um Zeichenkodierungen denen einige oder alle dieser Symbole nicht existieren verwenden, C + + definiert zwei Arten von Alternativen: zusätzliche Schlüsselwörter, die den Betreibern, die diese Zeichen und spezielle Kombinationen von zwei oder drei ISO 646 kompatible Zeichen interpretiert werden, verwenden entsprechen als wären sie eine einzige nicht-ISO 646 Zeichensatz .Original:
C++ (and C) source code may be written in any non-ASCII 7-bit character set that includes the ISO 646/ECMA-6 invariant character set. However, several C++ operators and punctuators require characters that are outside of the ISO 646 codeset:
{, }, [, ], #, \, ^, |, ~. To be able to use character encodings where some or all of these symbols do not exist, C++ defines two kinds of alternatives: additional keywords that correspond to the operators that use these characters and special combinations of two or three ISO 646 compatible characters that are interpreted as if they were a single non-ISO 646 character.The text has been machine-translated via Google Translate.
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Alternative Schlüsselwörter
Es gibt alternative Schreibweisen für mehrere Betreiber als Schlüsselwörter in der C + +-Standard definiert .
Original:
There are alternative spellings for several operators defined as keywords in the C++ standard.
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| Primary | Alternative |
|---|---|
&&
|
and
|
&=
|
and_eq
|
&
|
bitand
|
|
|
bitor
|
~
|
compl
|
!
|
not
|
!=
|
not_eq
|
| || | or |
|=
|
or_eq
|
^
|
xor
|
^=
|
xor_eq
|
Kompatibilität mit C
Die gleichen Wörter werden in der Programmiersprache C in der Include-Datei
<iso646.h> als Makros definiert. Da in C + + sind Schlüsselwörter der Sprache, die C + +-Version von <iso646.h> sowie <ciso646>, definiert nicht alles .Original:
The same words are defined in the C programming language in the include file
<iso646.h> as macros. Because in C++ these are language keywords, the C++ version of <iso646.h>, as well as <ciso646>, does not define anything.The text has been machine-translated via Google Translate.
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Digraphen und trigraphs
Die folgenden Kombinationen von zwei und drei Zeichen (Digraphen und trigraphs) gelten Substitutionen für ihre jeweiligen primären Zeichen:
Original:
The following combinations of two and three characters (digraphs and trigraphs) are valid substitutions for their respective primary characters:
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| Primary | Digraph | Trigraph |
|---|---|---|
{ |
<% |
??<
|
None} |
%> |
??>
|
[ |
<: |
??(
|
] |
:> |
??)
|
# |
%: |
??=
|
\ |
??/
| |
^ |
??'
| |
| |
??!
| |
~ |
??-
|
Keywords
and, and_eq, bitand, bitor, compl, not, not_eq, or, or_eq, xor, xor_eq
Beispiel
Das folgende Beispiel demonstriert die Verwendung von mehreren alternativen keywords:
Original:
The following example demonstrates the use of several alternative keywords:
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%:include <iostream>
int main(int argc, char *argv<::>)
<%
if (argc > 1 and argv<:1:> not_eq '\0') <%
std::cout << "Hello " << argv<:1:> << '\n';
%>
%>