id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
2755	compile error in boost_intrusive 1.38.0: a set of classes with protected destructor	fmot.fics@…	Ion Gaztañaga	"the following short code generates a compiler error:

#include <stdio.h>

#include <boost/intrusive/set.hpp>
#include <boost/noncopyable.hpp>

using namespace boost::intrusive;

struct node_t :
	set_base_hook<optimize_size<true> >
{
	bool operator < (const node_t& right) const;
protected:
	~node_t();
};

int main(int argc, char* argv[])
{
	set<node_t> nodes;
	nodes.insert(* new node_t);
	return 0;
}

// end of code

reason of compiler error:

in /boost/intrusive/detail/mpl.hpp, line 69:

static const bool value = sizeof(dispatch(trigger())) == sizeof(true_t);

trigger() function (line 67) returns an instance, thus forcing a compiler to look for destructor. it the sample above the destructor is protected, so it can't be accessed.

suggested solution:
in /boost/intrusive/detail/mpl.hpp, line 67:
static const T& trigger();

boost 1.37.0 had no such problem

best regards, vlad
fmot.fics@gmail.com"	Bugs	closed	Boost 1.39.0	intrusive	Boost 1.38.0	Problem	fixed	intrusive is_convertible destructor