On 09/03/11 08:28, Larry Evans wrote: [snip]
With the 2 attached files (compiled with gcc4.6 and with boost trunk [which svn update showed was revision 74198]), the output is:
[snip]
which shows several copy CTOR's executed. These copy CTOR calls were caused by the code like this:
curryable (Fun f, Arg0 a0, Arg1 a1, Arg2 a2): fun (f), arg0 (a0), arg1 (a1), arg2 (a2) { }
produced by the BOOST_PP code. Is there any way to prevent these copies, maybe by declarations like:
Arg0 const& arg0;
instead of the existing:
Arg0 arg0;
?
[snip] OOPS. I should have thought a bit more. The reason: Arg0 const& arg0; won't work is because the arguments to the curryable CTOR: curryable (Fun f, Arg0 a0): maybe be gone by the time f is actually called, and that's why they have to be copied. Sorry for noise :( -Larry