boost_filesystem 0.1.0

#include <string>
#include <iostream>

//  Minimal class path

class path
{
public:
    path(const char*)
    {
        std::cout << "path( const char * )\n";
    }
    path(const std::string&)
    {
        std::cout << "path( std::string & )\n";
    }

//  for maximum efficiency, either signature must work
#ifdef BY_VALUE
    operator const std::string() const
#else
    operator const std::string&() const
#endif
    {
        std::cout << "operator string\n";
        return m_path;
    }

#ifdef NAMED_CONVERSION
    std::string string() const
    {
        std::cout << "std::string string() const\n";
        return m_path;
    }
#endif

private:
    std::string m_path;
};

bool operator==(const path&, const path&)
{
    std::cout << "operator==( const path &, const path & )\n";
    return true;
}

//  These are the critical use cases. If any of these don't compile, usability
//  is unacceptably degraded.

void f(const path&)
{
    std::cout << "f( const path & )\n";
}

int main()
{
    f("foo");
    f(std::string("foo"));
    f(path("foo"));

    std::cout << '\n';

    std::string s1(path("foo"));
    std::string s2 = path("foo");
    s2 = path("foo");

#ifdef NAMED_CONVERSION
    s2 = path("foo").string();
#endif

    std::cout << '\n';

    // these must call bool path( const path &, const path & );
    path("foo") == path("foo");
    path("foo") == "foo";
    path("foo") == std::string("foo");
    "foo" == path("foo");
    std::string("foo") == path("foo");

    return 0;
}