How to check if an int on predefined list of values?

[arcull]

Hi everybody. I wonder if in C++ or Qt there is some simple way to check if an int equals to some int from a predefined list. I mean something like pseudo code below. Much thanks.

int a = 3;
int b = 8;
int c = 20;
 
int x = 5;
 
if (x in [a,b,c]) {
  //further processing
}
 
if (x in [2,7,5]) {
  //further processing
}

int a = 3;
int b = 8;
int c = 20;

int x = 5;

if (x in [a,b,c]) {
  //further processing
}

if (x in [2,7,5]) {
  //further processing
}

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