Peter Dimov <pdimov@mmltd.net> wrote:
How would you use such a thing? :-)
Here's a concrete example below. Though, as has been pointed out previously, boost::call_traits are probably not the most appropriate to use here. It assumes some other concepts not encapsulated here. matt. /*_____________________________________________________________________ created: 2004-6-8 12:06 filename: helpers.hpp author: Matt Hurd _______________________________________________________________________*/ #ifndef HELPERS_HPP_200468 #define HELPERS_HPP_200468 #define SYNCH_SIMPLE_ATTRIBUTE( VAR_NAME, VAR_TYPE ) \ \ public: \ template< bool > \ void \ VAR_NAME \ ( \ boost::call_traits< VAR_TYPE >::param_type new_ ## VAR_NAME \ ) \ { \ if ( boost::needs_lock<VAR_TYPE>::value ) { \ lock lk(guard_ ); \ VAR_NAME<false>( new_ ## VAR_NAME); \ } else { \ VAR_NAME<false>( new_ ## VAR_NAME); \ } \ } \ \ void \ VAR_NAME \ ( \ boost::call_traits< VAR_TYPE >::param_type new_ ## VAR_NAME \ ) \ { \ VAR_NAME < true > ( new_ ## VAR_NAME ); \ } \ \ template< > \ void \ VAR_NAME<false> \ ( \ boost::call_traits<VAR_TYPE>::param_type new_ ## VAR_NAME \ ) \ { \ VAR_NAME ## _ = new_ ## VAR_NAME; \ } \ \ template< bool > \ VAR_TYPE \ VAR_NAME( ) const \ { \ if ( boost::needs_lock< VAR_TYPE >::value ) { \ lock lk(guard_, synch::lock_status::shared ); \ return VAR_NAME<false>( ); \ } else { \ return VAR_NAME<false>( ); \ } \ } \ \ VAR_TYPE \ VAR_NAME( ) const \ { \ return VAR_NAME<true>( ); \ } \ \ template< > \ VAR_TYPE \ VAR_NAME <false>() const \ { \ return VAR_NAME ## _; \ } \ \ boost::call_traits<VAR_TYPE>::const_reference \ VAR_NAME ## _ref( ) const \ { \ return VAR_NAME ## _; \ } \ \ private: \ VAR_TYPE VAR_NAME ## _; \ #endif