C / C ++默认参数设置为previous参数 [英] C/C++ default argument set as a previous argument
问题描述
我无法找到一个明确的答案,这虽然可能是因为我没有使用正确的搜索条件,请重定向我,如果是这样的话。是否有可能在一个函数参数列表在参数列表后参数的默认值使用previous参数呢?例如,
I was unable to find a clear answer to this although that might be because I was not using the proper search terms so please redirect me if that is the case. Is it possible to use previous arguments in a functions parameter list as the default value for later arguments in the parameter list? For instance,
void f( int a, int b = a, int c = b );
如果这是可能是使用有什么规则? C和C ++之间有什么区别?
If this is possible are there any rules of use? Any difference between C and C++?
推荐答案
答案是否定的,你不能。你可以得到的行为要使用重载:
The answer is no, you can't. You could get the behaviour you want using overloads:
void f(int a, int b, int c);
inline void f(int a, int b) { f(a,b,b); }
inline void f(int a) { f(a,a,a); }
至于最后一个问题,C不允许在所有的默认参数。
As for the last question, C doesn't allow default parameters at all.
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