Concise way to say equal to set of values in C++

Question

For example I have the following string,

if (str[i] == \'(\' ||
    str[i] == \')\' ||
    str[i] == \'+\' ||
    str[i] == \'-\' ||
    str[i] == \'/\' ||
    s         


        

Answer 1

You may use the following:

const char s[] = "()+-/*";

if (std::any_of(std::begin(s), std::end(s), [&](char c){ return c == str[i]})) {
     // ...
}