Re: [Boost-users] Having trouble with a callback function (converted to a class) in Regex

AMDG Ramon F Herrera wrote:

This is my first non-trivial, multi-file C++ program with classes and I bumped into a problem. See example from the Regex library below.

The problem occurred after I converted the simple code below to a class (called "Pairs"). The troublesome statement is this one, where we attempt to take the address of a function.

std::for_each(m1, m2, ®ex_callback);

My first compilation attempt produces an error message from the compiler, which is nice enough to offer a solution:

pairs.cpp:247: error: ISO C++ forbids taking the address of an unqualified or parenthesized non-static member func tion to form a pointer to member function. Say `&Pairs::assignment_callback'

So, following the compiler's suggestion, I changed the line above to this:

std::for_each(m1, m2, &Pairs::assignment_callback);

Now, I am getting an inscrutable (for me, anyway) error message:

stl_algo.h:158: error: must use .* or ->* to call pointer-to-member function in `__f (...)'

Thanks for your kind assistance,

Try #include std::for_each(m1, m2, boost::bind(&Pairs::assignment_callback, _1)); In Christ, Steven Watanabe