Size of a directory [duplicate]

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As far as I am aware you have to do this with iteration on most operating systems.

You could take a look at boost.filesystem, this library has a recursive_directory_iterator, it will iterate though ever file on the system getting accumulation the size.

http://www.boost.org/doc/libs/1_49_0/libs/filesystem/v3/doc/reference.html#Class-recursive_directory_iterator

include <boost/filesystem.hpp>
int main()
{
    namespace bf=boost::filesystem;
    size_t size=0;
    for(bf::recursive_directory_iterator it("path");
        it!=bf::recursive_directory_iterator();
        ++it)
    {   
        if(!bf::is_directory(*it))
            size+=bf::file_size(*it);
    }   
}

PS: you can make this a lot cleaner by using std::accumulate and a lambda I just CBA

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