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/*
* Copyright © 2020 Canonical Ltd.
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Authored by: Christopher James Halse Rogers <christopher.halse.rogers@canonical.com>
*/
#ifndef WLCS_WL_INTERFACE_DESCRIPTOR_H
#define WLCS_WL_INTERFACE_DESCRIPTOR_H
struct wl_interface;
namespace wlcs
{
/***
* A specialisable struct containing the constants and types associated with a Wayland protocol
*
* \tparam WlType The base Wayland object type (eg; wl_surface, xdg_wm_base, etc)
*/
template<typename WlType>
struct WlInterfaceDescriptor
{
// Needed because apparently GCC < 10 can't compare a constexpr wl_interface const* const to nullptr in constexpr context?!
static constexpr bool const has_specialisation = false;
static constexpr wl_interface const* const interface = nullptr;
static constexpr void (* const destructor)(WlType*) = nullptr;
};
}
/***
* Declare a specialisation of WlInterfaceDescriptor for \param name
*
* This will use the standard Wayland conventions of
* name - name_interface - name_destroy
* (eg: wl_surface - wl_surface_interface - wl_surface_destroy)
*
* If an interface requires special handling, a manual specialisation can be
* provided (for example, see wl_output handling in in_process_server.h)
*/
#define WLCS_CREATE_INTERFACE_DESCRIPTOR(name) \
template<> \
struct WlInterfaceDescriptor<name> \
{ \
static constexpr bool const has_specialisation = true; \
static constexpr wl_interface const* const interface = &name##_interface; \
static constexpr void(* const destructor)(name*) = &name##_destroy; \
};
#endif //WLCS_WL_INTERFACE_DESCRIPTOR_H
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