Susan Flynn wrote:
In this context the library expects you to pass a function that takes 'string' and returns nothing. However, you pass a member function, which has implicit 'this' argument. I'd suggest this:
#include
.....
->notify(boost::bind(&Report::PrintName, this, _1))
HTH, Volodya
Hi, Thanks for the quick reply. I tried your suggestion and it didn't get rid of the compile error. I had also previously tried making PrintName be a function (instead of a member function) and it didn't compile either. To simplify everything, I took the first example from the tutorial, first.cpp, and added a notify and a new, simple function (boost 1.32, libs/program_options/example). In first.cpp, change line 23: ("compression", po::value<int>(), "set compression level") ---to--- ("compression", po::value<int>()->default(2)->notify(&PrintComp), "set compression level") then add this function before main: void PrintComp(int compr) { cout << "***Compression level is now " << compr << "\n"; }
The compile error is (still) 'invalid use of void expression'. Does my code above work for you?
No, but the attached does work. It differs only in using ->notifier not ->notify The 1.32 docs mistakenly had "notify" in one place, but I believe it's fixed now. Sorry for confusion. For calling member function, you'll still need 'bind'. - Volodya