are they adding copy_if to c++0x?

Question

It's very annoying that copy_if is not in C++. Does anyone know if it will be in C++0x?

Answer 1

Since the C++0x is not yet finalized, you can only take a look at the most recent draft.

Answer 2

In the meantime, it's not very hard to make your own copy_if() using remove_copy_if():

#include <functional>

struct my_predicate : std::unary_function<my_arg_type, bool> {
    bool operator()(my_arg_type const& x) const { ... }
};

// To perform "copy_if(x, y, z, my_predicate())", write:
remove_copy_if(x, y, z, std::not1(my_predicate()));

Using not1() requires your predicate class to supply a nested type, argument_type, identifying the type of the argument -- as shown above, one convenient way to do this is to derive from unary_function<T, U>, where T is the argument type.