id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
5645	Problem passing lambda functor to boost::bind - code does not compile	anonymous	Peter Dimov	"I want to create lambda functor for function with more that 3 parameters. I need to access 1 param only, so I decided to use helper functor created wih boost::bind. Unfortunately code does not compile. But when I stored created lambda functor in boost::function object, it compiles fine.
{{{
#include <boost/lambda/lambda.hpp>
#include <boost/lambda/bind.hpp>
#include <boost/bind.hpp>
#include <boost/function.hpp>
#include <iostream>

using namespace boost::lambda;

boost::lambda::placeholder1_type _l1;
boost::lambda::placeholder2_type _l2;

boost::arg<1> _b1;
boost::arg<4> _b4;

class IFoo
{
public:
    virtual ~IFoo() {}
    virtual void bar(int a, int b, int c, int d) = 0;
};

class Foo : public IFoo
{
public:
    boost::function<void(int, int, int, int)> bar_hook;
    
    void bar(int a, int b, int c, int d)
    {
        if (bar_hook)
            bar_hook(a, b, c, d);
    }
};

int main()
{
    Foo foo;
    int a = -1;
    
    // This works fine
    boost::function<void(int, int)> tmp_func = (_l2, var(a) = _l1);
    foo.bar_hook = boost::bind(tmp_func, _b1, _b4);
    
    // This fails to compile
    //foo.bar_hook = boost::bind( (_l2, var(a) = _l1), _b1, _b4 );
    
    foo.bar(1, 2, 3, 4);
    std::cout << ""a = "" << a << std::endl;
}
}}}"	Bugs	closed	To Be Determined	bind	Boost 1.45.0	Problem	invalid		viboes