Creating a simple configuration file and parser in C++

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谎友^ 2020-12-07 10:55

I am trying to create a simple configuration file that looks like this

url = http://mysite.com
file = main.exe
true = 0

when the program ru

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我在风中等你 (楼主)

2020-12-07 11:37

A naive approach could look like this:

#include 
#include 
#include 
#include 

std::map options; // global?

void parse(std::istream & cfgfile)
{
    for (std::string line; std::getline(cfgfile, line); )
    {
        std::istringstream iss(line);
        std::string id, eq, val;

        bool error = false;

        if (!(iss >> id))
        {
            error = true;
        }
        else if (id[0] == '#')
        {
            continue;
        }
        else if (!(iss >> eq >> val >> std::ws) || eq != "=" || iss.get() != EOF)
        {
            error = true;
        }

        if (error)
        {
            // do something appropriate: throw, skip, warn, etc.
        }
        else
        {
            options[id] = val;
        }
    }
}

Now you can access each option value from the global options map anywhere in your program. If you want castability, you could make the mapped type a boost::variant.

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