Re: [boost] [wave] found_include_directive

From: dherring_at_[hidden]
Date: 2007-05-22 15:29:02

On 20070519, Felipe Magno de Almeida wrote:
> I wanted to propose found_include_directive returning a bool. Where
> false would skip including the file.
> I need this so that I can selectively skip including files. I'm
> writing a dependency analysis for C++ files.

This analysis may fail unless all the files are processed...  An #include 
file may #define something that changes how the rest of the source is 
processed (e.g. "#define USE_FALLBACK_LIB").

Instead, you probably want a filter which eliminates tokens based on their 
#include depth (obtained from context::get_iteration_depth()).  This is 
convenient since the context is already passed to found_include_directive. 
To filter tokens before they are parsed, construct the context object, 
loop over context::begin() to end(), populate a new list with tokens of 
depth=0, and hand this second list to the parser.

- Daniel
Who learned this issue/solution from another user.