1. Boost.Filesystem file_size function returns a uintmax_t containing the size of the file named by the argument. The declaration looks like this:
uintmax_t file_size(const path& p);
2. For now, all you have to know is that class path has constructors that take const char* and many other useful types.
3. Using status queries to determine file existence and type, such as exists, is_directory and is_regular_file. And a file's status can be regular file, directory file and other type.
4. Directory_entry. A directory_entry object stores a path object, a file_status object for non-symbolic link status, and a file_status object for symbolic link status.
5. directory_entry. After a directory_iterator is constructed, and every time operator ++ is called, it reads a directory element and stores information about it in a object of type directory_entry.
Two end iterators are always equal.
Directory iteration shall not yield directory entries for the current (dot) and parent (dot dot) directories.
6. recursive_directory_iterator. Objects of type recursive_directory_iterator provide standard library compliant iteration over the content of a directory, including recursion into its sub-directories.
The behavior of a recursive_directory_iterator is the same as a directory_iterator unless otherwise specified.
Incrementing a recursive_director_iterator pointing to a directory causes that directory itself to be iterated ovee, as specified by the operator++ and increment functions.
When a recursive_directory_iterator reaches the end of the directory currently being iterated over, or when pop() is called, m_level is decremented, and iteration of the parent directory continues.
7. copy(directory_iterator(p), directory_iterator(), ostream_iterator<directory_entry>(cout, " "));
copy(InputIterator first, InputIterator last, OutputIterator result)
directory_itertor() return last.
vector<int> vec_it1, vec_it2;
copy(vec_it1.begin(), vec_it1.end(), vec_it2.begin());
copy(vec_it1.begin(), vec_it1.end(), back_inserter(vec_it2));
8. Building boost from visual studio 2012
Properties > Linker > General > Additional Library Directories添加包含的库目录
例如：D:oostoost_1_54_0stagelib
这在[2] 没有提到, 但缺少这个步骤的话会报错
Reference
[1] http://www.boost.org/doc/libs/1_55_0/libs/filesystem/doc/tutorial.html
[2] http://www.boost.org/doc/libs/1_55_0/more/getting_started/windows.html#build-from-the-visual-studio-ide
[3] http://blog.csdn.net/xzz_hust/article/details/9365511