[Solved] function for checking if a char array contains only allowed chars [closed]

by


I would be tempted to use good old std::strspn like this:

bool containsOnlyAllowedSymbols(const char* equation)
{
    return std::strspn(equation, "0123456789+-*/()[]{}") == std::strlen(equation);
}

5

solved function for checking if a char array contains only allowed chars [closed]