Evaluation order of function parameters in C + +

In C + +, if a function's argument list contains more than one argument, the order in which the parameters are evaluated is indeterminate.

In Rectification's "C + + Program Design" (second edition), P94, GCC evaluates parameters on aright-to-left order . But I do not measure this.

#include <iostream>#include<iomanip>using namespacestd;voidTestintXinty) {cout<<'x'<< x <<"y"<< y <<Endl;}intMain () {inti =3; Test (i, I++); I=3; Test (I,++i); I=3; Test (i++, i); I=3; Test (++I, i); return 0;}

The output of this program is:

X4 y3x4 y4x3 y4x4 Y4

Thus, even for the same compiler, the parameter evaluation order is indeterminate.

In practice, try to avoid situations where multiple expressions are included in a statement , or if there is no interaction between multiple expressions .

Evaluation order of function parameters in C + +