在 Lua 中，你可以这样做：
foo = a and b or c and d or e
这相当于（至少我很确定它相当于）：
local foo = nil
if a then
foo = b
elseif c then
foo = d
else
foo = e
end
在 C++ 中是否有与此等效或类似的东西？
问问题
2012 次
5 回答
6
I guess this is what you want:
foo = a ? b : (c ? d : e );
于 2012-05-26T09:53:46.370 回答
5
有三元运算符。它具有有趣的优先级，因此始终将其括起来是一个好习惯。
bool foo = ( a ? b : ( c ? d : e ) )
Note that this only works if b, d, and e can reduce to the same type. If a is a double, d is a float and e is an int, your result will always be cast to a double.
于 2012-05-26T09:53:42.410 回答
2
您可以使用三元运算符?:
foo = a ? b : c ? d : e;
于 2012-05-26T09:53:29.040 回答
1
Not really. The main reason this works in Lua is because of dynamic typing- in C++ you could never really make it work. The closest you can get is the ternary operator, but it has srs limitations.
于 2012-05-26T09:56:46.463 回答
-3
&&在C或C++中使用for and then并使用||for or else
将三元?:用于条件表达式
于 2012-05-26T09:53:36.930 回答