DefaultIntegral.h

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#ifndef ZYPP_BASE_DEFAULTINTEGRAL_H
#define ZYPP_BASE_DEFAULTINTEGRAL_H

#include <iosfwd>
#include <boost/static_assert.hpp>
#include <boost/type_traits/is_integral.hpp>

namespace zypp
{ 


  //
  //  CLASS NAME : DefaultIntegral<Tp,TInitial>
  //
  template<class Tp, Tp TInitial>
    class DefaultIntegral
    {
    public:
      typedef Tp value_type;

    public:
      DefaultIntegral( Tp val_r = TInitial )
      : _val( val_r )
      { BOOST_STATIC_ASSERT(boost::is_integral<Tp>::value); }

      Tp & get()       { return _val; }
      Tp   get() const { return _val; }

      operator Tp &()       { return get(); }
      operator Tp  () const { return get(); }

      constexpr Tp initial() const { return TInitial; }

      DefaultIntegral & reset() { _val = TInitial; return *this; }

      DefaultIntegral & operator=( Tp rhs )  {  _val = rhs; return *this; }
      DefaultIntegral & operator+=( Tp rhs ) { _val += rhs; return *this; }
      DefaultIntegral & operator-=( Tp rhs ) { _val -= rhs; return *this; }
      DefaultIntegral & operator*=( Tp rhs ) { _val *= rhs; return *this; }
      DefaultIntegral & operator/=( Tp rhs ) { _val /= rhs; return *this; }

      DefaultIntegral & operator++(/*prefix*/) { ++_val; return *this; }
      DefaultIntegral & operator--(/*prefix*/) { --_val; return *this; }

      DefaultIntegral operator++(int/*postfix*/) { return _val++; }
      DefaultIntegral operator--(int/*postfix*/) { return _val--; }

    private:
      Tp _val;
    };

    typedef DefaultIntegral<bool,true>  TrueBool;

    typedef DefaultIntegral<bool,false> FalseBool;

    template<typename TIntegral>
    using ZeroInit = DefaultIntegral<TIntegral,TIntegral(0)>;

    template<class Tp, Tp TInitial>
    std::string asString( const DefaultIntegral<Tp,TInitial> & obj )
    { return asString( obj.get() ); }

} // namespace zypp
#endif // ZYPP_BASE_DEFAULTINTEGRAL_H