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

It really depends on your application actually. For such a small check and depending the context, one acceptable option could be to use a macro

#include 
#define IS_DELIMITER(c) ((c == '(') || \
                         (c == ')') || \
                         (c == '+') || \
                         (c == '-') || \
                         (c == '/') || \
                         (c == '*')    )

int main(void)
{
    std::string s("TEST(a*b)");

    for(int i = 0; i < s.size(); i ++)
        std::cout << "s[" << i << "] = " << s[i] << " => " 
                  << (IS_DELIMITER(s[i]) ? "Y" : "N") << std::endl;
    return 0;
}

A more C++ish way of doing it would be to use an inline function

inline bool isDelimiter(const char & c)
{
  return ((c == '(') || (c == ')') || (c == '+') || 
          (c == '-') || (c == '/') || (c == '*')   );
}

This post might be interesting then : Inline functions vs Preprocessor macros