Public Member Functions | |
| Iow (Kvds &kvds, kvds_key_const_t const &key) | |
| Iow & | operator= (val_type const &val) |
| val_type & | operator* () |
| operator val_type const () | |
Private Attributes | |
| Kvds & | kvds_ |
| kvds_key_const_t const & | key_ |
| val_type | val_ |
Detailed Description
template<typename keyT, typename valT, template< typename > class KvdsTypeKey = KvdsIntegralType, template< typename > class KvdsTypeVal = KvdsIntegralType>
class moost::kvds::Kvds< keyT, valT, KvdsTypeKey, KvdsTypeVal >::Iow
Index operators normally return a reference to a value held within and when you then assign to an inderer you are actually assigning to the reference that has been returned. This won't work for a kvds because the reference returned would not update the store if it was modified. To get around this we return a value that is wrapped in a special class that implements an operator = and a cast operator. On return, if an assignment is made it will invoke the operator = which will update the value and the kvds store. If the result is assigned to a val_type the cast operator is invoked to return a copy of the value_type. The cost of this convenience is that a copy of the value type must be taken. In relality most compilers will optimise this away using RVO (Return Value Optimisation). http:///en.wikipedia.org/wiki/Return_value_optimization
Constructor & Destructor Documentation
| moost::kvds::Kvds< keyT, valT, KvdsTypeKey, KvdsTypeVal >::Iow::Iow | ( | Kvds & | kvds, |
| kvds_key_const_t const & | key | ||
| ) | [inline] |
Member Function Documentation
| moost::kvds::Kvds< keyT, valT, KvdsTypeKey, KvdsTypeVal >::Iow::operator val_type const | ( | ) | [inline] |
| val_type& moost::kvds::Kvds< keyT, valT, KvdsTypeKey, KvdsTypeVal >::Iow::operator* | ( | ) | [inline] |
| Iow& moost::kvds::Kvds< keyT, valT, KvdsTypeKey, KvdsTypeVal >::Iow::operator= | ( | val_type const & | val | ) | [inline] |
Member Data Documentation
kvds_key_const_t const& moost::kvds::Kvds< keyT, valT, KvdsTypeKey, KvdsTypeVal >::Iow::key_ [private] |
Kvds& moost::kvds::Kvds< keyT, valT, KvdsTypeKey, KvdsTypeVal >::Iow::kvds_ [private] |
val_type moost::kvds::Kvds< keyT, valT, KvdsTypeKey, KvdsTypeVal >::Iow::val_ [private] |
The documentation for this class was generated from the following file:
- /home/mhx/git/github/libmoost/include/moost/kvds/kvds.hpp
