Re: [Boost-users] [bind] Dereferencing placeholder argument

On Fri, Sep 9, 2011 at 10:04 AM, Ivan Le Lann wrote:

...

Is there a way of automatic placeholder argument dereferencing when using bind()? I mean:

std::vector foos;

// line below gives compilation error because second argument passed // to functor is Foo* and not Foo.

std::for_each(foos.begin(), foos.end(), bind(SomePredicate(), 123, _1);

From http://www.boost.org/doc/libs/1_47_0/doc/html/lambda/le_in_details.html#id21... (section "Sizeof and typeid")

for_each(a.begin(), a.end(),         cout << bind(&type_info::name, ll_typeid(*_1)));

Have you tried *_1 ?

I think that works with boost::lambda::bind and boost::lambda::_1 (also, presumably, the corresponding constructs in Phoenix) but not with plain boost::bind.