7acef299c2
Fix the declaration and documentation of `gi_object_info_find_method_using_interfaces()` and `gi_object_info_find_vfunc_using_interfaces()`. The documentation was wrong when I wrote it: the value returned is the object or interface which declares the method or vfunc, not the one which implements it. The returned declarer info may be a `GIObjectInfo` or a `GIInterfaceInfo`. Since those two types have no subtype relation between them, the return type has to be changed to `GIBaseInfo`. Using `GIObjectInfo` would have been fine in girepository-1.0 because all `*Info` types were aliases of each other — but since the move to `GTypeInstance` this is no longer true. A unit test will be in the following commit. Signed-off-by: Philip Withnall <pwithnall@gnome.org> Fixes: #3246
5.0 KiB
Title: Migrating from girepository-1.0 to girepository-2.0 SPDX-License-Identifier: LGPL-2.1-or-later SPDX-FileCopyrightText: 2014 GNOME Foundation
Migrating from girepository-1.0 to girepository-2.0
libgirepository was originally part of gobject-introspection, where it was prototyped for a number of years.
Now that it’s considered stable (for a long time), it’s been moved to glib in order to simplify the build process of the two modules.
As part of this move, the API version has been bumped from 1.0 to 2.0, and some
fairly straightforward API changes have been made. Note that the GIR version
was previously 2.0, and is now 3.0 — so the new version of libgirepository uses
girepository-2.0.pc and GIRepository-3.0.typelib.
The main change between the two versions of libgirepository is that it now uses [type@GObject.TypeInstance] as the basis of its type system, rather than simple C struct aliasing. This means that [type@GIRepository.BaseInfo] instances are now reference counted using [method@GIRepository.BaseInfo.ref] and [method@GIRepository.BaseInfo.unref].
It also means that runtime cast macros such as [func@GIRepository.CALLABLE_INFO] are now available. Using these instead of simple C casts can improve the runtime type safety of your code.
Stack allocation of some [type@GIRepository.BaseInfo] subtypes is still possible, but they must now be cleared using [method@GIRepository.BaseInfo.clear] once finished with. Previously this wasn’t necessary.
As part of moving the code over, the symbol prefix has changed from g_ to
gi_ — this has affected every API in the library, but trivially.
The types of various function arguments have changed — for example from
guint32 to size_t for most offsets. This will require minor adjustments in
your code if integer type warnings are enabled.
API replacements from version 1.0 to 2.0
| girepository-1.0 | girepository-2.0 |
|---|---|
GI_CHECK_VERSION |
[func@GLib.CHECK_VERSION] |
g_arg_info_get_closure |
[method@GIRepository.ArgInfo.get_closure_index] |
g_arg_info_get_destroy |
[method@GIRepository.ArgInfo.get_destroy_index] |
g_arg_info_get_type |
[method@GIRepository.ArgInfo.get_type_info] |
g_arg_info_load_type |
[method@GIRepository.ArgInfo.load_type_info] |
| - | [method@GIRepository.BaseInfo.ref] and [method@GIRepository.BaseInfo.unref] |
g_base_info_get_type |
[method@GIRepository.BaseInfo.get_info_type] |
g_callable_info_invoke arguments |
is_method and throws dropped in [method@GIRepository.CallableInfo.invoke] |
g_constant_info_get_type |
[method@GIRepository.ConstantInfo.get_type_info] |
g_field_info_get_type |
[method@GIRepository.FieldInfo.get_type_info] |
g_object_info_find_method_using_interfaces and g_object_info_find_vfunc_using_interfaces |
The implementor out argument has been renamed to declarer and is now of type [type@GIRepository.BaseInfo] |
g_object_info_get_type_init |
[method@GIRepository.ObjectInfo.get_type_init_function_name] |
g_object_info_get_ref_function |
[method@GIRepository.ObjectInfo.get_ref_function_name] |
g_object_info_get_unref_function |
[method@GIRepository.ObjectInfo.get_unref_function_name] |
g_object_info_get_set_value_function |
[method@GIRepository.ObjectInfo.get_set_value_function_name] |
g_object_info_get_get_value_function |
[method@GIRepository.ObjectInfo.get_get_value_function_name] |
g_property_info_get_type |
[method@GIRepository.PropertyInfo.get_type_info] |
g_registered_type_info_get_type_init |
[method@GIRepository.RegisteredTypeInfo.get_type_init_function_name] |
g_irepository_* |
gi_repository_* |
g_irepository_get_default |
Singleton object removed; create separate [class@GIRepository.Repository] instances instead |
g_irepository_get_search_path and g_irepository_get_library_path |
Now return arrays rather than linked lists |
g_irepository_enumerate_versions |
Now returns an array rather than a linked list |
g_irepository_dump |
Takes structured input_filename and output_filename arguments rather than a single formatted string |
g_function_invoker_destroy |
gi_function_invoker_clear() |
g_struct_info_get_copy_function |
[method@GIRepository.StructInfo.get_copy_function_name] |
g_struct_info_get_free_function |
[method@GIRepository.StructInfo.get_free_function_name] |
g_type_info_get_array_length and g_type_info_get_array_fixed_size |
Split success and failure return values out into a new out-argument and return value |
g_type_info_get_array_length |
[method@GIRepository.TypeInfo.get_array_length_index] |
g_typelib_new_from_* |
All replaced with gi_typelib_new_from_bytes() |
GI_FUNCTION_THROWS and GI_VFUNC_THROWS |
[method@GIRepository.CallableInfo.can_throw_gerror] |
g_union_info_get_copy_function |
[method@GIRepository.UnionInfo.get_copy_function_name] |
g_union_info_get_free_function |
[method@GIRepository.UnionInfo.get_free_function_name] |