functional.h

#pragma once

#if __cplusplus >= 201103L

#include <functional>

namespace mongo {
namespace stdx {

using ::std::bind;
using ::std::function;
namespace placeholders = ::std::placeholders;

}  // namespace stdx
}  // namespace mongo

#else

#include <boost/bind.hpp>
#include <boost/function.hpp>

namespace mongo {
namespace stdx {

using boost::bind;
using boost::function;

namespace placeholders {
static boost::arg<1> _1;
static boost::arg<2> _2;
static boost::arg<3> _3;
static boost::arg<4> _4;
static boost::arg<5> _5;
static boost::arg<6> _6;
static boost::arg<7> _7;
static boost::arg<8> _8;
static boost::arg<9> _9;
}  // namespace placeholders

}  // namespace stdx
}  // namespace mongo

#endif