[[docs:funcstructs:ggml-backend-reg.cpp]]
== ggml-backend-reg.cpp


[[docs:funcstructs:ggml-backend-reg.cpp:struct-ggml_backend_reg_entry]]
=== struct ggml_backend_reg_entry

[source,C++]
----
struct ggml_backend_reg_entry {
    ggml_backend_reg_t reg;
    dl_handle_ptr handle;
};
----

Note that [.codebit]#`ggml_backend_reg_t`# is an alias for [.codebit]#`ggml_backend_reg*`#.


[[docs:funcstructs:ggml-backend-reg.cpp:struct-ggml_backend_registry]]
=== struct ggml_backend_registry

It has two members:

* [.codebit]#`std::vector<ggml_backend_reg_entry> backends`#
* [.codebit]#`std::vector<ggml_backend_dev_t> devices`#

Its default constructor calls its [.codebit]#`register_backend(...)`# method with the [.codebit]##`ggml_backend_reg`##s specific to each backend with which llama.cpp is compiled (see [.codebit]#`ggml_backend_cuda_reg()`# and [.codebit]#`ggml_backend_cpu_reg()`#). This constructor *_should not_* be called manually, as this structure is meant to be a singleton. See [.codebit]#`get_reg()`#.


[[docs:funcstructs:ggml-backend-reg.cpp:struct-ggml_backend_registry.register_backend]]
=== struct ggml_backend_registry.register_backend

Signature:
[.codebit]#`void register_backend(ggml_backend_reg_t reg, dl_handle_ptr handle = nullptr)`#

Pushes the given pair into the structure's [.codebit]#`backends`# member and calls its [.codebit]#`register_device(...)`# method for every device associated with the [.codebit]#`ggml_backend_reg`# (uses [.codebit]#`ggml_backend_reg_dev_count(...)`# and [.codebit]#`ggml_backend_reg_dev_get(...)`# to iterate through and retrieve them).


[[docs:funcstructs:ggml-backend-reg.cpp:struct-ggml_backend_registry.register_device]]
=== struct ggml_backend_registry.register_device

Signature:
[.codebit]#`void register_device(ggml_backend_dev_t device)`#

Simply pushes to the structure's [.codebit]#`devices`# member.


[[docs:funcstructs:ggml-backend-reg.cpp:get_reg]]
=== get_reg

Signature: [.codebit]#`static ggml_backend_registry & get_reg()`#

Helps implement a singleton-like design pattern for [.codebit]#`struct ggml_backend_registry`#:

[source,C++]
----
static ggml_backend_registry & get_reg() {
    static ggml_backend_registry reg;
    return reg;
}
----


[[docs:funcstructs:ggml-backend-reg.cpp:ggml_backend_dev_get]]
=== ggml_backend_dev_get

Signature:
[.codebit]#`ggml_backend_dev_t ggml_backend_dev_get(size_t index)`#

Returns [.codebit]#`get_reg().devices[index]`#.