glibmm 2.46.2

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Glib::Container_Helpers::GSListKeeper< Tr > Class Template Reference

A keeper class for GSList. More...

`#include <glibmm/vectorutils.h>`

## Public Types

typedef Tr::CppType | CppType
typedef Tr::CType | CType

## Public Member Functions

| GSListKeeper (const GSList* gslist, Glib::OwnershipType ownership)
| Constructs an GSListKeeper holding gslist. More...
| GSListKeeper (const GSListKeeper& keeper)
| ~GSListKeeper () noexcept
GSList* | data () const
| Gets data the keeper holds. More...

## Detailed Description

### template<typename Tr>
class Glib::Container_Helpers::GSListKeeper< Tr >

A keeper class for GSList.

Primarily used by C++ wrappers like gtkmm.

Its main purpose is to free its data when they are not needed. What will be destroyed depends on passed ownership upon construction.

The most common usage of Glib::GSListKeeper is getting its data when converting std::vector to a GSList*:

void G::Temp::do_something(const std::vector<int>& v)
{
g_temp_do_something(gobj(), Glib::SListHandler<int>::vector_to_slist(v).data());
}

Variables of this class are seldom defined directly - it is mostly used as a temporary variable returned by Glib::SListHandler::vector_to_slist().

Note that the usage above is correct with regards to C++ standard point 12.2.3. That means that data returned by data() method is valid through whole g_temp_do_something function and is destroyed, when this function returns.

## Member Typedef Documentation

template <typename Tr >

typedef Tr::CppType Glib::Container_Helpers::GSListKeeper< Tr >::CppType

template <typename Tr >

typedef Tr::CType Glib::Container_Helpers::GSListKeeper< Tr >::CType

## Constructor & Destructor Documentation

template <typename Tr >

Glib::Container_Helpers::GSListKeeper< Tr >::GSListKeeper | ( | const GSList * | gslist,
|  | Glib::OwnershipType | ownership
| ) |  |

inline explicit

Constructs an GSListKeeper holding gslist.

ownership tells what should be destroyed with keeper destruction:

- Glib::OWNERSHIP_NONE - keeper won't destroy data it holds.
- Glib::OWNERSHIP_SHALLOW - keeper will destroy only container it holds.
- Glib::OWNERSHIP_DEEP - keeper will destroy data and container it holds.

Parameters

  gslist | - GList* to hold.
  ownership | - ownership definition.

template <typename Tr >

Glib::Container_Helpers::GSListKeeper< Tr >::GSListKeeper | ( | const GSListKeeper< Tr >& | keeper | ) |

inline

template <typename Tr >

Glib::Container_Helpers::GSListKeeper< Tr >::~GSListKeeper | ( |  | ) |

noexcept

## Member Function Documentation

template <typename Tr >

GSList* Glib::Container_Helpers::GSListKeeper< Tr >::data | ( |  | ) | const

inline

Gets data the keeper holds.

Note that this data is owned by the keeper, so there is no need to free it.

Returns
  GSList* owned by GSListKeeper.