id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
5227	find_ptr wrapper for map::find	olafvdspek@…	Marshall Clow	"Hi,

Would it be possible to include this handy wrapper for (unordered) map::find?

{{{
#include <boost/unordered_map.hpp>
#include <iostream>
#include <string>

using namespace std;

template <class T, class U>
typename T::mapped_type* find_ptr(T& c, U v)
{
	typename T::iterator i = c.find(v);
	return i == c.end() ? NULL : &i->second;
}

template <class T, class U>
const typename T::mapped_type* find_ptr(const T& c, U v)
{
	typename T::const_iterator i = c.find(v);
	return i == c.end() ? NULL : &i->second;
}

int main()
{
  typedef boost::unordered_map<int, string> very_long_type_name_t;

  very_long_type_name_t very_long_name;
  very_long_name[1] = ""one"";
  very_long_type_name_t::iterator i = very_long_name.find(1);
  if (i != very_long_name.end())
    cout << i->second << ""\n"";

  if (very_long_type_name_t::mapped_type* i = find_ptr(very_long_name, 1))
    cout << *i << ""\n"";

  /*
  very_long_type_name_t::iterator i = very_long_name.find(1); if (i != very_long_name.end()) cout << i->second << ""\n"";
  if (very_long_type_name_t::mapped_type* i = find_ptr(very_long_name, 1)) cout << *i << ""\n"";

  auto i = very_long_name.find(1); if (i != very_long_name.end()) cout << i->second << ""\n"";
  if (auto i = find_ptr(very_long_name, 1)) cout << *i << ""\n"";
  */
}
}}}"	Feature Requests	new	Boost 1.52.0	algorithm	Boost 1.46.0	Problem