The BOOST_PP_RELATIVE_START macro expands to the lower bound of a file-iteration depth relative to the current depth.
	
	Usage
		
			BOOST_PP_RELATIVE_START(i)
		
	Arguments
		
			- i
- 
				The relative depth of the frame whose lower bound is to be retreived. 
				Valid values range from 0 to BOOST_PP_ITERATION_DEPTH() - 1.
			
Remarks
		
			This macro is only valid when a file-iteration is in progress.
		
		
			The argument i is interpreted as the number of frames outward from the current frame.
		
	Requirements