Question

I am currently reading from an ini file with a key/value pair. i.e.

isValid = true

When get the key/value pair I need to convert a string of ‘true’ to a bool. Without using boost what would be the best way to do this?

I know I can so a string compare on the value ("true", "false") but I would like to do the conversion without having the string in the ini file be case sensitive.

Thanks

Answer 1

Another solution would be to use tolower() to get a lower-case version of the string and then compare or use string-streams:

#include <sstream>
#include <string>
#include <iomanip>
#include <algorithm>
#include <cctype>

bool to_bool(std::string str) {
    std::transform(str.begin(), str.end(), str.begin(), ::tolower);
    std::istringstream is(str);
    bool b;
    is >> std::boolalpha >> b;
    return b;
}

// ...
bool b = to_bool("tRuE");