Question

So I want to store pairs string-path <-> my_file_object in such container with expected total object size 100 000.

• I need to have search by absolute path to get an object for example I could search for a/b/c/file.h)
• I need to be capable to list all item names in folder like folder a/b/c/ contains files file.h, file.cpp, folder bin/ and folder bin2/
• I need to be capable to add new files by absolute path, and update them.
• I need to be capable to delete files.

I wonder about fiew things – is there a container for such things in STL/boost? Is this implementation threadsafe for read?

Also I wonder if it is any way faster than have all my pairs inside of std::map<string, object> so I would have fast search, fast insert and delete, and folder files listing via code like this?

Answer 1

What requirements do you have that rule out std::map? As far as I can see it will work well here:

typedef std::map<std::string,file_object_t> paths_t;
paths_t paths;

//I need to have search by absolute path
paths_t::iterator fileIterator = paths.find("a/b/c/file.h");
if( fileIterator  != paths.end() ) {
  ...
} 

//I need to be capable to list all item names in folder like folder a/b/c/
std::string folder = "a/b/c/";
paths_t::iterator folderBegin = paths.upper_bound(folder );
paths_t::iterator folderEnd = paths.upper_bound(folder+MAX_CHAR);
std::for_each(folderBegin,folderEnd,...);

//I need to be capable to add new files by absolute path
if( !paths.insert(paths_t::value_type("a/b/c/file.h",file)).second ) {
  //add file failed 
}

//and update them.
paths["a/b/c/file.h"].some_method_that_updates_file();

//I need to be capable to delete files
paths.erase(fileIterator);