ClickHouse/libs/libcommon/include/common/strong_typedef.h

#pragma once

#include <boost/operators.hpp>

/** https://svn.boost.org/trac/boost/ticket/5182
  */
#define STRONG_TYPEDEF(T, D)			                        \
struct D                                                        \
    : boost::totally_ordered1< D                                \
    , boost::totally_ordered2< D, T                             \
    > >                                                         \
{                                                               \
    T t;                                                        \
    explicit D(const T t_) : t(t_) {};                          \
    D(): t() {};                                                \
    D(const D & t_) : t(t_.t){}                                 \
    D & operator=(const D & rhs) { t = rhs.t; return *this;}    \
    D & operator=(const T & rhs) { t = rhs; return *this;}      \
    operator const T & () const {return t; }                    \
    operator T & () { return t; }                               \
    bool operator==(const D & rhs) const { return t == rhs.t; } \
    bool operator<(const D & rhs) const { return t < rhs.t; }   \
    T & toUnderType() { return t; }                             \
    const T & toUnderType() const { return t; }                       \
};