A connection to the Cloud Pub/Sub service to publish events.
This interface defines pure-virtual methods for each of the user-facing overload sets in Publisher. That is, all of Publisher's overloads will forward to the one pure-virtual method declared in this interface. This allows users to inject custom behavior (e.g., with a Google Mock object) in a Publisher object for use in their own tests.
To create a concrete instance that connects you to the real Cloud Pub/Sub service, see MakePublisherConnection().
The *Params nested classes
Applications may define classes derived from PublisherConnection, for example, because they want to mock the class. To avoid breaking all such derived classes when we change the number or type of the arguments to the member functions we define lightweight structures to pass the arguments.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14 UTC."],[[["\u003cp\u003eThis webpage details the \u003ccode\u003ePublisherConnection\u003c/code\u003e interface for the Google Cloud Pub/Sub C++ client library, specifically version 2.13.0, and provides links to documentation for multiple versions.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003ePublisherConnection\u003c/code\u003e defines pure-virtual methods that correspond to the user-facing overload sets in the \u003ccode\u003ePublisher\u003c/code\u003e class, enabling custom behavior injection for testing purposes.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eMakePublisherConnection()\u003c/code\u003e function is used to create a concrete instance that allows for a connection to the live Cloud Pub/Sub service.\u003c/p\u003e\n"],["\u003cp\u003eThe interface defines functions \u003ccode\u003ePublish\u003c/code\u003e, \u003ccode\u003eFlush\u003c/code\u003e, and \u003ccode\u003eResumePublish\u003c/code\u003e, each with corresponding parameter structures and return types that are detailed in tables.\u003c/p\u003e\n"],["\u003cp\u003eThe use of nested *Params classes help to ensure that changes to parameters in member functions will not affect derived classes.\u003c/p\u003e\n"]]],[],null,[]]
