class Interface

Interface is accessed by iterating on InterfaceList. It contains a pointer to an interface

descriptor. The returned descriptor pointer is valid for the lifetime of the InterfaceList used

to create the Interface.

If the interface is part of an interface association, it contains an assoc_ member that points to

the association descriptor, from which you can find the start of the association. While iterating

through interfaces, if an Interface has the assoc_ member, you may start keeping track of members

in the association. The assoc_.assoc_desc refers to the association that it is part of. When

assoc_.assoc_desc changes, a new association has started. If assoc_ disappears, the interface is

not part of the association anymore.

Example Usage of association():

std::optional

<InterfaceList

> interfaces;

status = InterfaceList::Create(my_client, true,

&interfaces

);

if (status != ZX_OK) {

...

}

usb_interface_assoc_descriptor_t* prev_assoc = nullptr;

for (const auto

&

interface : *interfaces) {

if (interface.association()) {

if (prev_assoc != interface.association()->assoc_desc) {

// A new association is found!

prev_assoc = interface.association()->assoc_desc;

}

// I am an interface part of prev_assoc

...

continue;

}

prev_assoc = nullptr;

// I am an interface not associated with an associations.

...

}