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#include <cstdio>
#include <string>

namespace bw {
    
    const std::string prefix = "(bw::string) ";
    
    class string {
        std::string _s = "";
        string ();
    public:
        string ( const std::string & s ) : _s( prefix + s) {}
        const char * c_str() const { return _s.c_str(); }
        operator std::string & () { return _s; }
        operator const char * () const { return _s.c_str(); }
    };
    
};  // namespace bwstring

int main() {
    const std::string s1("This is a string");
    std::puts(s1.c_str());
    
    const bw::string s2(s1);
    std::puts(s2);
    
    return 0;
}