-----Original Message----- From: boost-users-bounces@lists.boost.org [mailto:boost-users- bounces@lists.boost.org] On Behalf Of Larry Evans Sent: 10 February 2010 13:10 To: boost-users@lists.boost.org Subject: Re: [Boost-users] generate structs with all combinations of members from a given struct
On 02/09/10 16:12, Hicham Mouline wrote: [snip]
I have another problem for now.
What about precompiled headers? Microsoft provides them:
http://msdn.microsoft.com/en-us/library/szfdksca(VS.71).aspx
as well as gcc:
http://gcc.gnu.org/onlinedocs/gcc/Precompiled-Headers.html
HTH.
-Larry
Ah yes, I will look into that, gcc and msvc are the only 2 compilers I use anyways, thanks, Daniel, in the attached file in http://lists.boost.org/boost-users/2010/02/56100.php, in line 69, I am generating the struct name with a BOOST_PP_WHILE invocation, I then need to reuse the struct name to define a constructor for the struct, so I reinvoke the BOOST_PP_WHILE. Clearly, this is wasted reprocessing, but I don't see how to avoid it. Actually, it's not the struct constructor I need to write, but the assignment operator instead. The 2nd question is how to generate the struct definition including the operator= on multiple lines instead of just 1. Here is an example of the generation at work struct S { double d1; int i2; long l3; }; 1 of the 7 structs generated will look like struct S_i2_l3 { S_i2_l3& operator=( const S& rhs ) { i2 = rhs.i2; l3 = rhs.l3; } int i2; long l3; }; All the S_s should be generated just once ( I will look at precompiled headers for this ) Later on, I PP-generate these types typedef boost::multi_array<S_i2_l3, 5> multi_array_i2_l3; //// The 5 may be different for each of the 100 translation units because this multiarray may be very large (possibly millions of cells) it is useful to optimize the memory footprint. Had I indiscriminately used boost::multi_array<S,5>, and just filled/read from the S cells just the relevant fields, I would be wasting memory. Thanks,