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

Maybe not "more concise", but I think this style is succinct and expressive at the point of the test.

Of course is_arithmetic_punctuation needn't be a lambda if you're going to use it more than once. It could be a function or a function object.

auto is_arithmetic_punctuation = [](char c)
{
  switch(c)
  {
      case '(':
      case ')':
      case '+':
      case '-':
      case '/':
      case '*':
          return true;
      default:
          return false;
  }
};

if (is_arithmetic_punctuation(str[i]))
{
  // ...
}