Optional

Classes
struct	lrdb::bad_optional_access
struct	lrdb::nullopt_t
class	lrdb::optional< T >
	self implement for std::optional(C++17 feature). More...
class	lrdb::optional< T & >
	specialize optional for reference. sizeof(optional<T&>) == sizeof(T*) More...

relational operators
template<class T >
bool	lrdb::operator== (const optional< T > &lhs, const optional< T > &rhs)
template<class T >
bool	lrdb::operator!= (const optional< T > &lhs, const optional< T > &rhs)
template<class T >
bool	lrdb::operator< (const optional< T > &lhs, const optional< T > &rhs)
template<class T >
bool	lrdb::operator<= (const optional< T > &lhs, const optional< T > &rhs)
template<class T >
bool	lrdb::operator> (const optional< T > &lhs, const optional< T > &rhs)
template<class T >
bool	lrdb::operator>= (const optional< T > &lhs, const optional< T > &rhs)

Detailed Description