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Showing content from https://docs.microsoft.com/en-us/uwp/cpp-ref-for-winrt/event-token below:

winrt::event_token struct (C++/WinRT) - Windows UWP applications

A token returned when registering an event-handling delegate with an event; can be used to revoke the registration of the same delegate. For more info about handling events, and code examples, see Handle events by using delegates in C++/WinRT.

Syntax

struct event_token

Requirements

Minimum supported SDK: Windows SDK version 10.0.17134.0 (Windows 10, version 1803)

Namespace: winrt

Header: %WindowsSdkDir%Include<WindowsTargetPlatformVersion>\cppwinrt\winrt\base.h (included by default)

Data members Member operators Free operators event_token::operator bool

Checks whether or not the event_token object is valid and initialized.

Syntax

explicit operator bool() const noexcept;

Return value

true if the event_token object is valid and initialized (the value of its value field is not zero), otherwise false.

event_token::value data member

An opaque numeric value uniquely representing the registration of a delegate with an event.

Syntax

int64_t value{};

operator== (equality operator)

Returns a value indicating whether the two parameters are equal to one another.

Syntax

inline bool operator==(winrt::event_token const& left, winrt::event_token const& right) noexcept;

Parameters

left right An event_token value to compare with the other parameter.

Return value

true if the two parameters are equal to one another, otherwise false.