[C++11] Example of conversion operators

conversion_operators.cpp

#include <iostream>
#include <string>

using namespace std;

class FilePath
{
public:
    explicit FilePath(string filename) :
            filename_m(filename),
            exists_m(filename_m[0] == 'E')
    {
    }

    explicit operator bool() const
    {
        cout << "operator bool()" << endl;
        return exists_m;
    }

    operator string() const
    {
        cout << "operator string()" << endl;
        return filename_m;
    }

private:
    string filename_m;
    bool exists_m;
};


int main()
{

    if (FilePath path = FilePath("Enable.txt"))
    {
        string message = path;
        message += " exists";
        // Or:  string message = (string) path + " exists";
        // Or: string message = string(path) + " exists";

        cout << message << endl;

        //if (path == 1)
        {
            // Not possible because 'operator bool()' is marked as 'explicit'
        }
    }
}

output.txt

operator bool()
operator string()
Enable.txt exists