Defaults, and overriding them.

The logging lib has a few default types, used throughout the lib. They are:

char_type - the char type used throught the lib; by default, it's char
hold_string_type - the type used to hold a string; by default, it's std::string
filter_type - the default filter; by default, it's filter::no_ts
lock_resource - used to lock resources for access. See locker namespace.
mutex - the mutex class used throughout the library. By default, it's mutex_win32 for Windows, or mutex_posix for POSIX

They are all present in default_types structure.

If you want to override any of the above, you should do the following:

before including anything from Boost Logging Library, #include <boost/logging/defaults.hpp>
override the types
do #include <boost/logging/logging.hpp>

Example:

    #include <boost/logging/defaults.hpp>

    namespace boost { namespace logging {
        struct types<override> : default_types {
            // define your types
            typedef wchar_t char_type;
            // etc.
        };
    }}

    #include <boost/logging/logging.hpp>