在C ++中定义逻辑真？ [英] Definition of logical true in C++?
问题描述
如果我定义了一个函数，那么在出现错误时将返回-1，否则将返回
正值：
int foo（int param ）{
if（outOfRange（param））
返回-1;
return（param！= 0）;
}
我可以依赖这段代码一直工作，还是
return语句可能产生-1也，在特定的编译器/操作系统上？
这是在某处定义的吗？如果是这样，标准中的哪个位置？
最好的问候，
Lars
If I define a function, that shall return -1 in case of error, and a
positive value otherwise:
int foo (int param) {
if (outOfRange (param))
return -1;
return (param != 0);
}
can I rely on this code always working, or is it possible that the
return statement produces a -1 also, on a specific compiler / OS?
Is this defined somewhere? And if so, where in the standard?
Best Regards,
Lars
推荐答案
Lars Uffmann写道：
Lars Uffmann wrote:
我可以依赖这段代码一直工作，还是有可能
return语句在特定的编译器/操作系统上也产生-1？
这是在某处定义的吗？如果是这样，标准中的哪个位置？
can I rely on this code always working, or is it possible that the
return statement produces a -1 also, on a specific compiler / OS?
Is this defined somewhere? And if so, where in the standard?
由4.5 / 4定义，布尔值true提升为1，布尔值false为0.
-
Sebastian Redl
As defined by 4.5/4, boolean true is promoted to 1, boolean false to 0.
--
Sebastian Redl
Sebastian Redl写道：
Sebastian Redl wrote:
由4.5 / 4定义，布尔值为true提升为1，布尔值为0.
As defined by 4.5/4, boolean true is promoted to 1, boolean false to 0.
谢谢，这就是我需要知道的全部 - 尽管我只是注意到有
不容易找到C ++标准的在线版本 - 你能够将b $ b指向我吗？
最好的问候，
Lars
Thanks, that''s all I needed to know - though I just noticed that there''s
no easily found online version of the C++ standards - are you able to
point me to one?
Best Regards,
Lars
Lars Uffmann写道：
Lars Uffmann wrote:
Sebastian Redl写道：
Sebastian Redl wrote:
>由4.5 / 4定义，布尔值true提升为1，布尔值false提升为0.
>As defined by 4.5/4, boolean true is promoted to 1, boolean false to 0.
谢谢，这就是我需要知道的全部 - 尽管我只是注意到了
在网上很难找到C ++标准的离子 - 你能够将b $ b指向我吗？
Thanks, that''s all I needed to know - though I just noticed that there''s
no easily found online version of the C++ standards - are you able to
point me to one?
http://webstore.ansi.org/RecordDetai...IEC+14882-2003
-
Ian Collins。
http://webstore.ansi.org/RecordDetai...IEC+14882-2003
--
Ian Collins.
这篇关于在C ++中定义逻辑真？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
